BSc CSIT Entrance Chemistry Questions with Answers

Bronze is an alloy of

Answer: Cu & Sn

The reaction of conc. $HNO_3$ with iron gives

Answer: $Fe_3O_4$

Cinnabar is ore of

Answer: Hg

The number of water molecules associated with copper sulphate is

Answer: 5

Brass is a/an

Answer: alloy

Silver is extracted from its sulphide ore by

Answer: cyanide process

Which of the following compounds is called magnesia?

Answer: $\ce{Mg(OH)2}$

$\ce{MgSO4.7H2O}$ is known as

Answer: Epsom salt

Minamata disease was caused by consumption of fish containing

Answer: mercury

Metal used for galvanizing iron sheet is

Answer: Zinc

Which of the following compound is called lunar caustic?

Answer: $\ce{AgNO3}$

Which of the following is an amphoteric oxide?

Answer: $ZnO$

Down's process is used for the extraction of

Answer: sodium

Hematite is an ore of

Answer: Iron

Chemical formula of white vitriol

Answer: $\ce{ZnSO4.7H2O}$

Molecular formula of calomel is

Answer: $\ce{Hg2Cl2}$

Malachite is an ore of

Answer: Cu

In the extraction of iron from hematite using blast furnace, iron oxide is reduced by

Answer: CO

Down's process is used for the extraction of

Answer: sodium

The molecular formula of the white vitriol is

Answer: $ZnSO_4.7H_2O$

Cinnabar is an ore of

Answer: mercury

Which is the most important ore of Zinc

Answer: Zinc blende

Chalcopyrite is an ore of

Answer: Cu

The substance used as flux in the extraction of iron from hematite in blast furnace is

Answer: Limestone

The formula of bleaching powder is

Answer: Ca(OCl)Cl

Which of the following metals generate $H_2$ on treatment with dil.$HNO_3$?

Answer: Mn

Haematite is an ore of

Answer: Fe

Hematite is an ore of

Answer: Iron

Zinc sulphate ($ZnSO_4\cdot7H_2O$) is also called

Answer: White vitriol

Brass is an alloy of

Answer: Copper and Zinc

The formula of dolomite is

Answer: $CaCO_3\cdot MgCO_3$

The formula of Zinc blende is

Answer: $\ce{ZnS}$

The formula of Epsom salt is

Answer: $\ce{MgSO4.7H2O}$

PbO is an example of

Answer: amphoteric oxide

$N_2O$ gas is evolved when copper reacts with

Answer: dilute $HNO_3$

The compound formed during the ring test for nitrate is

Answer: $\ce{FeSO4.NO}$

Kipp's apparatus is used for the preparation of

Answer: $\ce{H2S}$

The composition of brown ring in nitrate test is

Answer: $\ce{FeSO4.NO}$

The formula of hypo is

Answer: $\ce{Na2S2O3}$

The structure of Buckminster fullerene ($C_{60}$) contains

Answer: 20 six member rings and 12 five member rings

$\ce{FeSO4}$ forms brown ring with

Answer: NO

Which of the following is neutral oxide?

Answer: $\ce{H2O}$

Catalyst used in the oxidation of $\ce{SO2}$ to $\ce{SO3}$ in the manufacture of sulfuric acid by contact process is

Answer: $\ce{V2O5}$

Heavy water is

Answer: Deuterium oxide ($\ce{D2O}$)

MgO is an example of

Answer: basic oxide

Ammonia is manufactured by

Answer: Haber's process

An example of acidic oxide is

Answer: $SO_2$

Ammonia is manufactured by the use of

Answer: Haber's Process

Dry ice is

Answer: Solid $CO_2$

Number of atoms in one molecule of sulfur is

Answer: 8

Which of the following noble gas is not present in atmosphere?

Answer: Rn

Hydrogen molecule which has parallel spin of two nuclei is called

Answer: Ortho hydrogen

Which of the following oxides is acidic?

Answer: $\ce{CO2}$

Orthophosphoric acid is

Answer: Tribasic acid

Ostwald's process is used for the manufacture of

Answer: nitric acid

The atomic number of an element equals the number of

Answer: protons

The pH of a neutral solution at 25 degrees C is

Answer: 7

The molecular mass of water (H2O) is approximately

Answer: 18

Avogadro's number is approximately

Answer: 6.022 x 10^23

The bond in sodium chloride (NaCl) is

Answer: ionic

How many moles of CO2 are present in 4.4 g of CO2? (Molar mass of CO2 = 44 g/mol)

Answer: 0.1 mol

What is the pH of a 0.01 M HCl solution?

Answer: 2

What is the electronic configuration of Cl (Z = 17)?

Answer: 2,8,7

Which of the following elements has the smallest atomic radius?

Answer: Si

What is the hybridization of carbon in methane (CH4)?

Answer: sp3

What is the IUPAC name of CH3-CH2-OH?

Answer: Ethanol

For the equilibrium A <-> B, Kc = 4. If [A] = 1 M at equilibrium, what is [B]?

Answer: 4 M

What is the volume occupied by 1 mole of an ideal gas at STP (0 C, 1 atm)?

Answer: 22.4 L

Which of the following metals is the strongest reducing agent based on standard electrode potential?

Answer: Na

What is the coordination number of Co in [Co(NH3)6]Cl3?

Answer: 6

In the Bronsted-Lowry theory, what is the conjugate base of H2O?

Answer: OH-

A reaction that releases heat to the surroundings is called what type of reaction?

Answer: Exothermic

Which reagent is used to convert an alkene to an alcohol via Markovnikov addition of water?

Answer: Dilute H2SO4/H2O

What is the molarity of a solution containing 5.85 g NaCl (molar mass 58.5 g/mol) dissolved in 500 mL of solution?

Answer: 0.2 M

What is the oxidation number of Mn in KMnO4?

Answer: +7

The principal quantum number of an atom is related to the

Answer: size of the shell

The number of unpaired electrons present in 3d-orbital of $Fe^{3+}$ ion is

Answer: 5

The actual electronic configuration of copper is

Answer: $[Ar]3d^{10}4s^1$

The outermost electronic configuration of chromium is

Answer: $3d^{5}4s^{1}$

In a given atom no two electrons can have the same values for all the four quantum numbers. This is called

Answer: Pauli's exclusion principle

Which is not the isotope of hydrogen?

Answer: fullerene

Magnetic quantum number specifies

Answer: orbital orientation

Which of the following orbital has highest energy level

Answer: 4d

Which property of an element is always a whole number?

Answer: atomic number

Azimuthal quantum number specifies

Answer: Shape of the orbital

The electronic configuration of chromium is

Answer: $[Ar]3d^54s^1$

"Atomic orbitals are filled up in the ground state in order of increasing energy level". This statement is called

Answer: Aufbau principle

The spectral region for the Lyman series of hydrogen spectrum lies in the

Answer: ultra-violet region

Magnetic quantum number specifies

Answer: Orientation of orbitals

How many orbitals are possible for principle quantum number 3?

Answer: 9

Bohr's model was modified by

Answer: Somerfield

Electrons will distribute themselves in degenerate orbitals so as to retain parallel spin as much as possible. This is called

Answer: Hund's rule

The actual electronic configuration of copper is

Answer: $[Ar]4s^13d^{10}$

The number of molecules in 32.0 g of oxygen gas is

Answer: $6.023\times10^{23}$

The law of conservation of mass was developed by

Answer: Antoine Laurent de Lavoisier

The number of molecules in 32 g of oxygen is

Answer: $6.02\times10^{23}$

The number of molecules in $32,\text{g}$ of oxygen is

Answer: $6.02\times10^{23}$

The mass of product is equal to mass of reactants. It is

Answer: Law of conservation of mass

The molarity of pure water is

Answer: 55.55M

The mass of one atom of hydrogen is approximately

Answer: $1.6\times10^{-24}$ g

The number of atoms of carbon present in 25.0 g of $CaCO_3$ is

Answer: $1.505\times10^{23}$

How many oxygen atoms are present in 8.0 g of oxygen?

Answer: $3.0115\times10^{23}$

The number of moles present in 90 g of water is

Answer: 5.0

1.0 g of $HCl$ reacts with 1.0 g of $CaCO_3$, the volume of $CO_2$ produced at NTP would be equal to

Answer: 0.224 liters

Which of the following methods of expressing concentration is independent of temperature

Answer: Molality

The number of moles of water present in 18g of water is

Answer: 1

Hemoglobin contains 0.33% of iron by weight. Molecular weight of hemoglobin is 67200. The number of iron atoms (At wt of Fe = 55.85) in one molecule of hemoglobin is

Answer: 4

How many oxygen atoms are there in 8.0 g of oxygen atoms?

Answer: $3.011\times10^{23}$

The weight of 100 ml of $NH_3$ gas at NTP is

Answer: 0.0759 g

The law of multiple proportions was given by

Answer: John Dalton

44 gm of $CO_2$ is equal to

Answer: $6.023\times10^{23}$ no of $CO_2$ molecule

Ostwald's dilution law is applied for the ionization of

Answer: $NH_4OH$

The concept of pH was introduced by

Answer: Sorensen

$\ce{CO2}$ is a

Answer: Lewis acid

An example of Lewis base is

Answer: $NH_3$

Which of the following will show common ion effect

Answer: $\ce{HCl}+\ce{H2S}$

Which of the following statement is correct for pure water? With increase in temperature

Answer: both pH and pOH decreases

The aqueous solution of which of the following salt will be neutral?

Answer: $\ce{Na2SO4}$

The pair of compounds which cannot exist together in solution is

Answer: $\ce{NaHCO3}$ and NaOH

The pH of 0.04 M $HNO_3$ is

Answer: 1.4

An example of Lewis base is

Answer: $NH_3$

An aqueous solution of $Na_2CO_3$ would be

Answer: basic

Which one of the following is not a Lewis base?

Answer: $BF_3$

An aqueous solution of NaCl would be

Answer: Neutral

The pH of pure water at $50^\circ$C would be

Answer: <7.0

What is the pH of 0.001 M HCl?

Answer: 3.0

The degree of dissociation of an electrolyte

Answer: Increases with dilution

If the pH of a solution is 5.2, the hydrogen ion concentration of the solution is

Answer: $6.3\times10^{-6}$ M

The unit of first order rate constant is

Answer: $time^{-1}$

The factor which does not influence the rate of reaction is

Answer: molecularity

The rate of a chemical reaction increases with

Answer: increase in temperature

The rate of reaction is independent of

Answer: molecularity

The rate of a reaction depends on

Answer: all of the above

Rate of first order reaction depends upon

Answer: conc. of reactant

A first order reaction is $50%$ completed in $50$ minutes, when will $75%$ of the reaction be completed?

Answer: $100$ minutes

In a reaction $2A+B\to C+D$ the molecularity of the reaction is

Answer: $3.0$

The unit of rate constant for first order reaction is

Answer: $\mathrm{sec^{-1}}$

The unit of rate constant for a first order reaction is

Answer: $s^{-1}$

The unit of rate constant for third order reaction is

Answer: $mol^{-2}L^2s^{-1}$

Consider the reaction $2A+B\to C+D$. If the concentration of the reactants are increase by three times, the rate of reaction will increase by.

Answer: 27 times

The rate of reaction is independent of

Answer: Molecularity

The unit of rate constant for first order reaction is

Answer: $sec^{-1}$

Tollen's reagent is

Answer: ammoniacal silver nitrate solution

Ammonical silver nitrate solution is known as

Answer: Tollen's reagent

Aldehydes can be distinguished from ketones by

Answer: Fehling's solution

IUPAC name of acetaldehyde is

Answer: ethanal

IUPAC name of acetone is

Answer: Propan-2-one

Which is not true for ketones?

Answer: reduce Tollen's reagent

In which of the following reactions, both oxidized and reduced forms of the same compound are obtained.

Answer: Cannizzaro reaction

Which of the following carbohydrates gives Tollen's test?

Answer: glucose

The reduction of aldehydes or ketones by amalgamated zinc and concentrated HCl to the corresponding alkane is called

Answer: Clemenssion reduction

The catalyst used in Rosenmund's reduction is

Answer: $Pd-BaSO_4$

Which of the following reagent cannot be used to distinguish between acetaldehyde and acetone

Answer: $Br_2$ in $CCl_4$

When formaldehyde reacts with ammonia, it gives

Answer: urotropine

The compound that undergoes Cannizzaro reaction is

Answer: HCHO

Which of the following reagents is used to detect the aldehyde group?

Answer: Tollen's reagent

Ethyne reacts with alkaline $\ce{KMnO4}$ solution to give

Answer: oxalic acid

Which of the following reagents can distinguish alkyne from alkane?

Answer: Bayer's reagent

The IUPAC name of iso-butane is

Answer: 2-methylpropane

An alkaline $KMnO_4$ solution is known as

Answer: Baeyer's reagent

The general formula of alkanes is

Answer: $C_nH_{2n+2}$

The intermediate product of Markovnikov's addition is

Answer: Carbocation

Acetylene contains

Answer: $2\pi$ and $3\sigma$ bond

Wurtz reaction cannot be applied to prepared

Answer: Methane

$Al_4C_3$ reacts with water to give

Answer: $CH_4$

Anti-Markovnikov addition of HBr is observed in

Answer: Propene

The gas obtained by adding water on aluminium carbide is

Answer: methane

Paraffins are also called

Answer: alkanes

$\ce{Al4C3}$ reacts with water to give

Answer: $\ce{CH4}$

Which of the following compounds is used as the best anti-knocking agent?

Answer: Tetraethyl lead

The shape of $PCl_5$ molecule based on VSEPR theory is

Answer: trigonal bipyramidal

The shape of $NH_3$ molecule is

Answer: pyramidal

Which of the following hydrogen halides has the lowest dipole moment?

Answer: $HI$

The ionic character in H-X bond is highest in

Answer: $HF$

The shape of $SF_6$ molecule based on VSEPR theory is

Answer: octahedral

Which of the following has an electrovalent linkage?

Answer: $MgCl_2$

The structure of methane is

Answer: tetrahedral

The structure of $CO_2$ molecule is

Answer: linear

The shape of $BeF_2$ molecule on the bases of VSEPR theory is:

Answer: linear

The molecular geometry of which compound cannot be predicted by the application of VSEPR theory

Answer: $MgCl_2$

In which of the following compound the molecular geometry cannot be predicted by the use of VSEPR theory?

Answer: $\ce{C2H6}$

Which of the following compounds has the highest boiling point?

Answer: $CH_3OH$

The structure of ammonia molecule is

Answer: trigonal pyramidal

According to IUPAC classification of elements noble gas are placed in group

Answer: 18

The most electronegative element in the periodic table is

Answer: fluorine

Which of the following has the lowest ionic radius?

Answer: $Al^{3+}$

The element having highest value of electronegativity is

Answer: fluorine

Which of the following has highest size?

Answer: Na

Which has the highest first ionization potential?

Answer: Ne

Which of the following elements has highest electron affinity?

Answer: chlorine

Which of the following halogens has highest electron affinity?

Answer: chlorine

Which of the following is an amphoteric oxide?

Answer: ZnO

Electronic configuration of four elements A, B, C, D are as follow, which will be most metallic?

Answer: C=2,8,1

$Na_2O$ is a

Answer: Basic oxide

Which of the following elements has highest electronegativity?

Answer: Fluorine

Among the following elements, the one having highest electron affinity is

Answer: chlorine

An example of condensation polymer is

Answer: bakelite

2,4-Dichlorophenoxyacetic acid (2,4-D) is generally used as

Answer: a herbicide

Which of the following compound is called urea?

Answer: $\ce{NH2CONH2}$

An example of organophosphate insecticides is

Answer: Malathion

The color of dye is due to presence of certain group containing multiple bonds called

Answer: Chromophore

Antiseptic action of Dettol is mainly due to

Answer: Chloroxylenol

D.D.T is a

Answer: Insecticide

DDT is an example of

Answer: insecticide

Tranquilizers are substances used for the treatment of

Answer: mental anxiety

Dettol is an example of

Answer: antiseptic drug

BHC is an example of

Answer: pesticide

Penicillin is an example of

Answer: Antibiotic drug

Terylene is a

Answer: condensation polymer

Benzene molecule is

Answer: planar

Benzene was isolated first by

Answer: Faraday

The catalyst used in Friedel Craft's alkylation reaction is

Answer: anhydrous $\ce{AlCl3}$

Each carbon atom of benzene is

Answer: $sp^2$ hybridized

In benzene all the C-C bonds have same length because of

Answer: Resonance

Nitrating of benzene by the use of nitrating mixture is an example of

Answer: Electrophilic substitution

Each carbon atom in benzene is

Answer: $sp^2$ hybridized

The reaction of benzene with alkyl chloride in presence of anhydrous AlCl3 is

Answer: Friedel Craft's reaction

Which of the following is a meta directing group?

Answer: $-COOH$

How many position isomers are possible for dichlorobenzene?

Answer: 3

Benzene is converted to toluene by

Answer: Friedel Craft reaction

Ethanol and diethyl ether are

Answer: functional isomers

Tetrahedral structure of carbon was proposed by

Answer: van't Hoff and Le Bell

Detection of nitrogen, sulphur and halogens in organic compounds is done by

Answer: Lassaigne's test

Fat is a

Answer: lipid

The secondary suffix of the IUPAC name of the compound $\text{CHO}-\text{CH}_2-\text{CHOH}-\text{COOH}$ is

Answer: oic acid

Lewis acid and oxidizing agents are

Answer: Electrophiles

How many structural isomers are possible for $\ce{C6H14}$

Answer: 5

The IUPAC name of $C-(CH_3)_4$ is

Answer: 2,2 dimethyl propane

The members of a homologous series have

Answer: different molecular weight

A blood red coloration of ferric sulphocyanide obtained by addition of ferric chloride in sodium extract confirms the presence of

Answer: both a and b

A green color is formed in Lassaigne's test if nitrogen is present in an organic compound. This green color is due to the formation of

Answer: $\ce{Fe4[Fe(CN)6]3}$

Titration between silver nitrate and sodium chloride is called

Answer: Precipitation titration

Which of the followings is not a primary standard substance?

Answer: $\ce{KMnO4}$

The weight of sodium carbonate required to prepare 1000 mL of its Deci normal solution is

Answer: 5.3 g

Equivalent weight of sulphuric acid is equal to its

Answer: mol. wt./2

Equivalent weight of potassium permanganate in acidic media is equal to its

Answer: mol.wt./5

Equal volume of $1.0$M HCl and $1.0$ M NaOH are mixed together. The concentration of the NaCl produced would be

Answer: $0.5$ M

Which of the following compound is not a primary standard substance?

Answer: potassium permanganate

$1,M;H_2SO_4$ is equal to

Answer: $2N;H_2SO_4$

Equivalent weight of $KMnO_4$ in neutral medium is

Answer: 52.6

Equivalent weight of potassium dichromate in acidic medium is equal to

Answer: Mol. wt/6

The weight of sodium carbonate required to prepare 100 mL of Deci normal sodium carbonate solution is

Answer: 0.53 gm

The apparatus used for the experimental determination of heat of a reaction is called

Answer: Calorimeter

An intensive property is

Answer: density

A spontaneous change is one in which the system has

Answer: lowering of free energy

Which law of thermodynamics is illustrated by the statement "The total amount of energy in the universe remains constant"?

Answer: first law

1 calorie is equal to

Answer: 4.184 joules

Which of the following is an intensive property?

Answer: concentration

1 calorie is equals to

Answer: 4.184 Joules

Gibb's Helmholtz equation is

Answer: $\Delta G=\Delta H-T\Delta S$

Hess's law deals with

Answer: Total change in heat of reaction

The enthalpy of formation of the compound is

Answer: can be positive or negative

Which of the following is not true for aniline?

Answer: does not give coupling reaction

The action of $\ce{NaNO2}$/HCl on primary amine gives

Answer: Alcohol

An example of Zwitter ion is

Answer: Glycine hydrochloride

Protein is a polymer of

Answer: α-amino acid

Which of the following compounds is most basic?

Answer: $(CH_3)_2NH$

When benzamide is treated with aqueous $Br_2$ in presence of aqueous alkali, the product formed is:

Answer: aniline

Amino acid contains

Answer:

• $NH_2$ and -COOH groups

The compound that gives positive carbylamine reaction is

Answer: $(CH_3)NH_2$

Aniline on warming with Benzaldehyde gives

Answer: Schiff's base

Oxidation number of Cl in $NaClO_3$ is

Answer: $+5$

Oxidation number of chromium in $Cr_2O_7^{2-}$ is

Answer: $+6$

Oxidation state of oxygen in peroxide

Answer: -1

The oxidation number of Fe in the compound $Fe_3O_4$ is

Answer: +8/3

The oxidation of Fe in $K_3[Fe(CN)_6]$ is

Answer: +3

In alkaline condition $KMnO_4$ reacts as follows: $2KMnO_4+2KOH\to2K_2MnO_4+H_2O+O$. The equivalent weight of $KMnO_4$ is

Answer: M/1

What is oxidation of chlorine in HOCl?

Answer: +1

The oxidation state of iron in Mohr's salt is

Answer: +2

The equation used to calculate the emf of an electrochemical cell is

Answer: Nernst eq

A device which can generate electricity by means of a redox reaction is called

Answer: all of the above

Potential of hydrogen electrode is

Answer: Zero

Coating of Zn on iron for the prevention of rusting is known as

Answer: Galvanizing

The unit of cell constant is

Answer: $cm^{-1}$

The unit of equivalent conductivity is

Answer: $Scm^2,equivalent^{-1}$

The CGS unit of specific conductance is

Answer: Siemen $cm^{-1}$

Which of the following acids has the highest boiling point?

Answer: $C_3H_7COOH$

IUPAC name of formic acid is

Answer: methanoic acid

Aromatic carboxylic acid is

Answer: cinnamic acid

Which of the following is the strongest acid?

Answer: $\ce{Cl3CCOOH}$

Carboxylic acid has general formula as

Answer: $\ce{C_nH_{2n}O2}$

When oxalic acid crystals and glycerol are mixed and heated to about $110^\circ$C, the compound obtained is

Answer: formic acid

The IUPAC name of n-valeric acid is

Answer: Pentanoic acid

When chloroform is heated with zinc dust and water it gives

Answer: $CH_4$

Which of the following compound is used as anaesthetic?

Answer: chloroform

Which element can not be detected by Lassaigne's test?

Answer: Fluorine

Haloalkane when heated with sodium metal in presence of ether as solvent gives alkanes. This reaction is known as

Answer: Wurtz reaction

When haloalkane solution is treated with metallic sodium in presence of dry ether, respective alkane is obtained. This reaction is known as

Answer: Wurtz reaction

Which of the following is not a nucleophile?

Answer: $\ce{BF3}$

Chloroform reacts with concentrated HNO3 on heating and yields

Answer: chloropicrin

The major product of reaction between ethanol and potassium dichromate in presence of sulphuric acid is

Answer: $\ce{CH3COOH}$

Ethyl alcohol of 100 percent purity is called

Answer: absolute alcohol

Which is correct for the reaction of Lucas reagent with tertiary alcohol?

Answer: turbidity appears immediately

Primary, secondary and tertiary alcohols are distinguished by

Answer: Victor Meyer's test

Primary, secondary and tertiary alcohols are distinguished by

Answer: Victor Meyer's test

The mixture of HCl and $ZnCl_2$ is known as

Answer: Lucas reagent

Picric acid is obtained by the nitration of

Answer: phenol

Picric acid is obtained by the nitration of

Answer: phenol

Bakelite is made by the action of

Answer: phenol and formaldehyde

The organic acid which do not contain -COOH group is

Answer: Picric acid

The reaction of Phenol with concentrated nitric acid and concentrated sulphuric acid gives:

Answer: picric acid

Haber's process is used for the manufacture of

Answer: ammonia

Urea is a

Answer: Nitrogenous fertilizer

The catalyst used in the contact process is

Answer: $\ce{V2O5}$

Ammonia is manufactured by the use of

Answer: Haber's process

Which one of the following is a condensation polymer?

Answer: Terylene

Prussian blue is

Answer: $\ce{Fe4[Fe(CN)6]3}$

Corrosive sublimate is

Answer: $\ce{HgCl2}$

Which is the most toxic chemical forms of mercury?

Answer: $\ce{CH3Hg+}$

Which of the following compound is called corrosive sublimate?

Answer: $HgCl_2$

The compound $Na_2[Fe(CN)_5NO]$ is known as

Answer: sodium nitroprusside

Which of the followings is related to Uranium series?

Answer: $(4n+2)$

The radioactive rays having highest penetrating power is

Answer: $\gamma$ rays

Radioactive isotopes of hydrogen is

Answer: Tritium

The unit of radioactivity is

Answer: curie

The half-life of an radioisotope is 30 minutes. After how much time the amount of radioisotope left is 1/4th of the original amount?

Answer: 60 minutes

The value of universal gas constant (R) in SI unit is

Answer: $8.314\ joule\ K^{-1}mol^{-1}$

The crystal structure of sodium chloride is

Answer: face centered cubic

A cooking gas cylinder can withstand a pressure of 20 atmosphere. At $27^\circ C$ the pressure of the containing gas is 10 atmosphere. On raising the temperature, the cylinder will burst when the temperature exceeds

Answer: $327^\circ$ C

The gas law which deals with the effect of pressure in a given volume of gas at constant temperature is known as

Answer: Boyle's Law

Which of the following is the unit of surface tension?

Answer: $dynes.cm^{-1}$

The type of bonding in protein is

Answer: all of above

Protein is a compound having

Answer: peptide linkage

Which one of the following is present as a sugar unit in DNA?

Answer: deoxyribose

Enzymes are

Answer: Protein

Which base is found only in the nucleotides of RNA?

Answer: Uracil

Which is correct for transition elements?

Answer: exhibit variable oxidation states

Which of the following is an example of transition metal?

Answer: cobalt

The molecular formula of green vitriol is

Answer: $FeSO_4.7H_2O$

The general electronic configuration of zinc is

Answer: $[Ar]4s^23d^{10}$

The function of myoglobin is

Answer: Storage of oxygen

The metal ion present in chlorophyll is

Answer: $\ce{Mg^2+}$

The reduction of nitrobenzene in neutral medium gives

Answer: phenyl hydroxylamine

Reduction of nitrobenzene in acidic medium gives

Answer: aniline

The reaction of ketone with Grignard's reagent gives

Answer: tertiary alcohol

A class of organometallic compounds of magnesium with the general formula $RMgX$ (where R is an organic group and X is a halogen atom) is known as

Answer: Grignard's reagent

Which of the following compound is called blue vitriol?

Answer: $\ce{CuSO4.5H2O}$

Chalcopyrite is commonly known as

Answer: fool's gold

A mixture containing camphor and sand can be separated by

Answer: Sublimation

Gypsum used in cement manufacturing process acts as

Answer: retarder

Williamson's synthesis is used for the preparation of

Answer: ether

$\ce{C6H12O6}$ is formula of

Answer: all of above

Fructose is an example of

Answer: Ketose

Martius yellow is an example of

Answer: acid dyes