Question # 1

The compound used to distinguish the ethyne and ethene is

Choose an answer

Alkaline KMnO4

Ammonical AgNO3

Bromine water

Tollen's Reagent

Liquids evaporate at every temperature. When the temperature becomes constant for a liquid, then:

Choose an answer

rate of evaporation is greater than the rate of condensation

the rate of condensation is greater than the rate of evaporation

The rate of condensation and evaporation become equal

it depends upon the nature of the liquid

Which of the following statement about the order of reaction is true?

Choose an answer

The order of reaction can only be determined by experiment

a second order reaction is also bimolecular

The order of reaction is always non-zero

The order of reaction increases with increasing temperature

Name the compound, which shows geometric isomerism

Choose an answer

I-bromo-2-chloropropene

2.3-dimethy lpropene

2-pentene

Both A & B

The enzyme which is found in saliva, accelerates the conversion of starch into sugar is

Choose an answer

Pepsin

Thrombin

Ptyalin

Fumarase

The electrochemical series is based on

Choose an answer

pH scale

Redox scale

Hdrogen scale

Arrhenius scale

Compound X & Y give effervesce with Na2CO3, solution. X gives a white ppt with ammonical AgNO3 while Y gives sweet smell compound on heating with alcohol X &Y are

Choose an answer

Formic acid & acetic acid

Acetone & formic acid

Acetaldehy de & acetic acid

Acetic acid & acetone

The solubility of Fe(OH)3 is 'x' mole per dm3. Its Ksp would be

Choose an answer

9X3

3X4

27X4

9X4

pi-bond can be formed by sideways overlap of

Choose an answer

s-orbital

d-orbital

p-orbital

sp orbital

Decomposition of H2O is

Choose an answer

Endothermic reaction

Nuclear reaction

Exothermic reaction

Zero nuclear reaction

The sun is a ball of plasma heated by nuclear fusion is

Choose an answer

1.0 million km

2.0 million km

1.5 million km

2.5 million km

A covalent bond may be

Choose an answer

100% covalent

Partial ionic

100% ionic

Both a and b

Someone is saying that glass must be a super cooled liquid. The reason that he might have in his mind is that glass has :

Choose an answer

definite shape

definite-volume

crystalline structure

no crystalline structure

Boiling point of water is higher (100°C) than that of ethanol (78.5°C) although both have hydrogen bonding. This is because

Choose an answer

water molecules are closely packed

water is more acidic than ethanol

ethanol is an organic liquid

number of hydrogen bonds are more in H₂O

The crystal system which has all cell angles equal, but not 90°and less than 120° , the system is

Choose an answer

orthorhombic

monoclinic

hexagonal

rhombohedral

At constant pressure, if the original volume is 546 cm³at which temperature the volume of gas 552 cm³

Choose an answer

1°C

2°C

3°C

4°C

Cl₂is a gas while iodine is a solid due to

Choose an answer

stronger London forces with high polarizability

greater electro negativity of Cl than iodine

stronger dipole dipole forces

iodine is colored while chlorine is colourless

Acetone and chloroform are soluble in each other due to:

Choose an answer

intermolecular hydrogen bonding

dipole-dipole interaction

instantaneous dipoles

all of the above

Which is most acidic?

Choose an answer

H2O

C2H5OH

C4H9OH

CH3-CH2-CH2OH

Which of the following contains maximum of number of molecules?

Choose an answer

100 cc of CO₂ at STP

150 cc of N₂at STP

50 cc of SO₂ at STP

200 cc of NH₃ at STP

Which of the following metal oxides is antiferromanetic in nature?

Choose an answer

MnO₂

TiO₂

NO₂

CrO₂

Most of the reactions which give stable products are

Choose an answer

Endothermic

Exothermic

Isothermal

Non of these

The actual volume of gas molecules is considered negligible at following pressures

Choose an answer

2atm

4atm

6 atm

8 atm

The alcohol that does not form curbonyl compound on oxidation

Choose an answer

iso-butyl alcohol

neo pentyl alcohol

Ethanol

ter-butyl alcohol

Which of the following salts would give the same products irrespective of whether its molten form or concentrated aqueous solution is electrolysed?

Choose an answer

Magnesium bromide

Magnesium sulphate

Copper sulphate

Copper chloride

Zinc reacts with dilute acids to liberate hydrogen. This is because:

Choose an answer

Zn2+ ion is a powertul osidising agent than H' ion

H+ ion is a powerful oxidising agent than Zn ion

Zn2+ ion is a powerful reducing agent than H' ion

H+' ion is a powerful reducing agent than Zn- ian

Diamond is a bad conductor of electricity because:

Choose an answer

it has a tight structure

it has a high density

there are no free electrons

none of the above

Which compounds is alicyclic in nature?

Choose an answer

Cyclobutane

Iso-bstand

n-Butane

Toluend

The boiling point of radon (211 K) is higher than boiling point of Helium (4.4 K) because

Choose an answer

the atomic number of Rn is larger than that of the He

the atomic mass of Rn is larger than that of He

the dispersion forces between Rn atoms are more prominent that between He atoms

Rn atoms are joined by dipole-dipole force whereas He atoms are joined by hydrogen bonding

According to the general gas equation, density of an ideal gas depends upon

Choose an answer

Pressure

Temperature

Molar mass of the gas

All of the above

Lind's ,method for liquefaction of gases is based on the principle of:

Choose an answer

Graham's law of diffusion

Joule Thomson effect

Avogadro's hypothesis

Dalton's law of partial pressure

The bonding which occurs among polar covalent molecules containing H and one of the small electronegative element such as O, F or N is called

Choose an answer

bridge bonding

metallic bonding

hydrogen bonding

Ionic bonding

On the basis of intermolecular forces diamond is a

Choose an answer

ionic solid

covalent solid

metallic solid

molecular solid

The total pressure exerted by a mixture of gases is the sum of the partial pressure of all the gases present is a statement of

Choose an answer

Charle's Law

Boyle's Law

Dalton's Law

Graham's Law

What is the mass of 10²⁰molecules of CO₂at STP?

Choose an answer

7.3 x 10^-3g

7.9 x 10^-3g

3.2 x 10^-3g

4.9 x 10^-3g

If Kc value is small then equilibrium position will shift

Choose an answer

Towards left

Remains unchanged

Towards right

lt is always constant value

Some of crystals are good conductors of heat and electricity, they may be

Choose an answer

ionic in nature

of metallic character

covalent in nature

of molecular nature

Which of the following best describes the shape and polarity of the carbon disulphide molecule?

Choose an answer

Bent and polar

Linear and non-polar

Pyramidal and polar

Bent and non-polar

Amorphous solids

Choose an answer

have sharp melting points

undergo clean cleavage when cut with knife

have perfect arrangement of atoms

can possesses small regions of orderly arrangements of atoms

One of the following is a ionic solid. Which is that?

Choose an answer

Fe

KBr

Diamond

Cr

If a gas expands at constant temperature

Choose an answer

The pressure decreases

The Kinetic energy of the molecules remains the same

The kinetic energy of the molecules decreases

The number of molecules of the gas increase

In s solution 7.8 g of benzene ( C6H6 ) and 46g of toluene (C6H5CH3) is present. The mole fraction of toluene is

Choose an answer

1/3

1/5

2/3

5/6

NH₃shows maximum boiling among the hydrides of group V elements. The is due to:

Choose an answer

pyramidal structure of NH₃

H-bonding between its molecules

enhanced electronegative character

very small size of nitrogen

The relative rates of diffusion of a gas (Mol.wt.=98) as compared to hydrogen will be

Choose an answer

1/7

1/5

1/4

1

NaCI has face centered cubic structure. The Na ion at the face of the unit cell is shared by

Choose an answer

2-unit cells

4-units cells

only one unit cell

8-unit cells

The electrolyte used in fuel cell is

Choose an answer

КOH

NaCl(aq)

NaNO3

Molten NaCl

If a = b = c and x = y = z 90° then crystal structure is

Choose an answer

Cubic

Tetragonal

Orthorhombic

Triclinic

Coinage metals Cu. Ag, and Au are the least reactive because they have

Choose an answer

Negative reduction potential

Positive reduction potential

Negative oxidation potential

Positive oxidation potential

The destiny of a gas is directly proportional to pressure, inversely proportional to temperature and directly proportional to:

Choose an answer

Viscosity

Molar mass

Momentum

All of above

The boiling point of radon (211k)id higher than boiling point of helium (4.4k). This is due to the reason that:

Choose an answer

the atomic mass Rn is larger than that of He

the dispersion forces between Rn atoms are more prominent than between he atoms

rn atomic number of Rn is larger than that of He

1 gram formula refers to

Choose an answer

Amount in grams equivalent to 1 mole of a atom

Amount in grams equivalent to 1 mole of a covalent compound

Amount in grams equivalent to 1 mole of a ionic compound

Amount in grams equivalent to 1 mole of an ion

Third order of protein structure refers to

Choose an answer

Bending of protein chain

Three-dimensional structure of protein

Number and sequence of amino acids

Site of disulphide bonds

Oxidation state of Mn' in KMnO4. K2MnO4, MnO2 and MnSO4 is in the order

Choose an answer

+7.+6.+2,+4

+6,+7,+2,+4

+7. +6.+4.+2

+4, +6, +7,+2

Which of the followings has electronic configuration of Ar in +3 oxidation state

Choose an answer

Sc

Mn

Ti

Zn

Equal masses of methane and oxygen are mixed in an empty container at 25∘C.

Choose an answer

1/3

8/9

1/9

16/17

Equal volumes of ideal gases contain equal number of molecules at:

Choose an answer

Same temperature

Same pressure

Same environmental conditions

Both (A) and (B)

The rate of diffusion of a gas is:

Choose an answer

Inversely proportional to its density.

Inversely proportional to square root of its molecules mass.

Directly proportional to molecular mass.

Directly proportional to its density.

Which of the elements has seven electrons in d-subshell?

Choose an answer

Zn

Co

Cu

Fe

The examples of a hexagonal system is

Choose an answer

sugar

graphite(a=b not equal to c) {Alpha =beta. not equal to gamma}

sulphur

diamond

Amount of heat absorbed when one mole of a solid melts into liquid form at its melting point is called:

Choose an answer

heat of vaporization

latent heat of fusion

molar heat of fusion

molar heat of sublimation

Which of the following pairs of not form a dative covalent bond to each other?

Choose an answer

NH₃ and H⁺

H₂O and H⁺

NH₃ and BF₃

CH₄ and AICI₃