Question # 1

Temperature required for the dehydration of ethanol into ethene in the presence of HaSOu is

Choose an answer

130°C

170°C

175°C

180°C

By increasing the concentration of reactants, the rate of reaction

Choose an answer

Decreases

Increases

Remains constant

Not predicted

Which element exists as discrete small molecules in the solids state

Choose an answer

Aluminum

Silicon

Iodine

Sodium

Which one of the following is an appropriate indication of positive iodoform test?

Choose an answer

Formation of H2O

Brick red precipitate

Release of H2 gas

Yellow precipitate

Under which condition CO has the maximum molar volume

Choose an answer

high T and P

Low T and High p

high T and low P

Low T and low P

Alkanes do not show geometrical isomerism due to

Choose an answer

Hyperconjugation

Resonance

Rotation around single hond

Restricted rotation around doubled bond

Fluorine is largely used in

Choose an answer

rocket fuels

making Teflon

making freon

All

Units of van der Waals constant a is

Choose an answer

atm dm⁶/mol² & Nm⁴/mol²

atm dm⁴/mol² & Nm⁴/mol²

atm dm⁴/mol² & Nm⁶/mol²

None of these

Tertiary aleohols producewith acidified KMno,

Choose an answer

Ketones

Aldehydes

Malonic acid

Alkene

The highest melting point is observed by

Choose an answer

Butanoic acid

Propanoic acid

Pentanoie acid

HCI

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

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

The one atmospheric pressure of air in term of pound per square inches is

Choose an answer

101.325

1.01325

760

14.7

When ethyl magnesium bromide is treated with carbon dioxide and the product hydrolyzed we get

Choose an answer

formic acid

propionic acid

oxalic acid

acetic acid

Which one of the following is not true of metallic bonding?

Choose an answer

it gives rise to excellent electrical conductivity

electrons are following to move throughout the structure

the strength of metallic bonds increases down a group

the strength of metallic bonding affects the boiling point of metals

The non polar gases of low polarizability have a very:

Choose an answer

Low critical temperature

Stable critical temperature

High critical temperature

Primany aleohols sornally give us aldehyde when oxidized in the presence of acidified Na2Cr2O7, what will be the product, when the secondary alcohols are oxidized in same condition?

Choose an answer

Alkenes

Alkyl halide

Alkynes

Ketones

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

Choose an answer

Zn

Co

Cu

Fe

A graph is plotted, P on x-axis and V on y-axis for a given mass at constant temperature, we shall get:

Choose an answer

a curve with different peaks

a curve called isotherm

straight line parallel to x-axis

a straight line

Esterification of CH3COOH isreaction

Choose an answer

Acid base

Electrophilic

Redox

Nucleophilic

When light is exposed to transtion element, then electrons jump from lower orbitals to higher orbitals in

Choose an answer

Orbitals of s-subshell

Orbitals of d-subshell

Orbitals of p-subshell

between different shells

The reaction of alkyl halide in the presence of alcoholic KOH is

Choose an answer

Substitution

Addition

Acid-base

Elimination

Acetylide can give back ethyne upon treatment with

Choose an answer

water

strong base

dil. Acid

weak base

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

The energy difference of d-orbitals varies from

Choose an answer

Atom to atom

lon to ion

Electron to electron

proton to proton

which of the following d blocks element can showthe highest oxidation number is its ompound

Choose an answer

Chromium

iron

Copper

Manganese

The Cl- ion present at the corner of the unit cell is NaCl crystal, contributes

Choose an answer

1/8 th

1/4 th

1/2 th

1

Propanone does not undergo

Choose an answer

Oxime formation

Reduction of Fehling solution

Hydrazone formation with hydrazine

Reaction with HCN

Aniline is the derivative of the benzene containing the

Choose an answer

Hydroxyl group

Amino group

Amido group

Imido group

Most of the reactions which give stable products are

Choose an answer

Endothermic

Exothermic

Isothermal

Non of these

Water may boil at 120 °C when external pressure is:

Choose an answer

100 mm of Hg

700 mm of Hg

760 mm of Hg

1489 mm of Hg

The alkaline earth metals are called so because they

Choose an answer

form alkaline solution and are present in earth crust as minerals

form alkaline solution and are found in nature states

are present in earth crust

are present in earth crust as their minerals

Which one of the followings is resistant to oxidation under normal conditions

Choose an answer

Methyl alcohol

Acetaldehyde

Ethyl alcohol

Acetone

The rate of reaction for a reaction is 30 mol dm-3sec-1 if the product of concentration of 10.reactant is unity the specific rate constant is

Choose an answer

25

2.5

30

15

Temperature at which molecular motion ceases is called

Choose an answer

Absolute zero

Absolute temperature

Critical temperature

Difficult to predict

4.4 g of CO₂ contains how many litres of CO₂ at STP?

Choose an answer

2.4 litre

2.24 litre

44 litre

22.4 litre

For formation of ionic bond, electronegativity difference should be

Choose an answer

Equal to zero

Equal to 0.5

More then 1.7

Less than 1.7

Allotropic forms of carbon are:

Choose an answer

five

three

four

two

A system absorbs 100 kJ heat and performs 50 kJ work on the surroundings. The increase in internal energy of the system is

Choose an answer

50kJ

100 kJ

150kJ

5000 kJ

Kerosene is liquid at room temperature.This is due to:

Choose an answer

organic nature

H-bonding

molecular size

dipole-dipole forces

The working condition/s for SHE

Choose an answer

1atm pressure

1M H-solution

298K temperature

All of these

The gas which obey's the gas laws at all conditions of temperature and pressure is called:

Choose an answer

Perfect gas

Super gas

Ideal gas

Real gas

Which of the following equation is for idea gas:

Choose an answer

PV = dRT

PR = nTP

PM = nRT

PV = nRT

The angle between the unhybridized 2pz orbital and the three sp2 hybrid orbitals in ethene is

Choose an answer

180°

120°

90°

60°

The volume of gas depends upon the ______ molecules

Choose an answer

Size of

Molecular weight

Space between

Both a and b

The increase in reaction rate as a result of increase in temperature from 10K to 90K is

Choose an answer

512

256

400

112

The highest temperature at which a substance can exist as a liquid is called its:

Choose an answer

Critical temperature

Zero temperature

Absolute temperature

None of above

Choose from the followings the correct statement about Born Haber cycle

Choose an answer

Born Haber cycle is different from Hess's law

The energy changes in a cyclic process is not zero

The lattice energy of crystalline substances can be calculated easily

None

Which of the following is not the property of liquid crystal

Choose an answer

anisotropic

isotropic

three dimensional arrangement

fluidity

The decomposition of N2O4 to NO2 is carried out at 280°C in chloroform. When quilibrium is reached. 0.2 moles of N2O4 and 0.02 mole of NO2 are present in 1:1 ratio The equilibrium constant for the reaction N2O4------> 2NO2 is

Choose an answer

0.01

0.001

0.02

0.002

Haemoglobin molecule is how many times heavier than helium atom

Choose an answer

68000 times

17000 times

,34000 times

, 1700 times

The formation of acetic anhydride from acetic acid follows the mechanism

Choose an answer

SN

AN

SE

AE

The transition temperature of KNO3, is

Choose an answer

13.2°C

95.5°C

128°C

32.02°C

The law of distribution of energy is given by

Choose an answer

Clausius

Maxwell

Bernoulli

Boltzmann

Which of the following successive ionization energies belong to a Group ll element?

Choose an answer

320,600,1110,1700,5650,

577,1820,2740,1160,14800,

428,3070,4600,5860,7990

736,1451,7740,10500,13600

To measure the true pressure of a gas collected over water, the pressure due to water vapoure is:

Choose an answer

added to the total pressure

multiplied to the total pressure

divided by the total pressure

subtracted form the total pressure

On adding NH3 to water

Choose an answer

lonic product will increase

[H3O+] will inerease

lonic product will decrease

[H3O+] will decrease

The hydrocarbon with maximum B.P is

Choose an answer

CH4

C6H14

C4H10

C2H6

Butane molecule can have maximum no of isomers

Choose an answer

2

5

4

3

The relationship between density and molar mass of a gas is

Choose an answer

Directly proportional

^{Inversly proportional}

Straight line

Stoichiometric

Gram atoms of hydrogen in 5.5 g H2

Choose an answer

5.50

2.25

5.45

2.20