Question # 1

How should the conditions be changed to prevent the volume of a given gas from expanding when its mass in increased

Choose an answer

temperature is lowered and pressure is increased

temperature is increased and pressured is lowered

temperature and pressure both are lowered

temperature and pressure both are increased

Liquefaction of gas can only be carried out if the:

Choose an answer

without caring for the value critical volume at critical stage

the temperature is more than critical and pressure is 1000 atm

the temperature is below the critical and pressure is very high

temperature is above the critical temperature and pressure can have any value

The graph between pressure and volume at constant temperature for gas is:

Choose an answer

Isobaric

Isothermal

Isotherm

None of above

An excess af silver nitrate is added to the aqueous barium chloride and the precipitate is removed by filtration. What are the main ions in the filtrate?

Choose an answer

Ag+ and NO3-, only

NO3- and Ba+2 only

Ag+ and NO-3, and Ba+2 only

CI- and NO-3, and Ba+2 only

The formation of acetic anhydride from acetic acid follows the mechanism

Choose an answer

SN

AN

SE

AE

The amount of heat absorbed when one mole of a liquid is changed into vapours at its boiling point is called

Choose an answer

Heat of sublimation

Heat of vaporization

Heat of fusion

Enthalpy change

What is the pressure of 2 mole of NH₃ at 27°C when its volume is 5 lit.in Van der Waals equation?(a = 0,17,b = 0.03711)

Choose an answer

10.33 atm

9.333 atm

9.74 atm

9.2 atm

Correct statement about Nucleophilic substitution bimolecular is

Choose an answer

Transition state is formed

Inversion take place

It is two step reacticn

Both a &c

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

For a particular halogen, the reactivity of alkyl halides

Choose an answer

remains same with C-increase

decreases with C-increase

increases with C-increase

decreases with C-decrease

The protein component of enzyme ls called

Choose an answer

apoenzyme

proenzyme

holoenyme

co-enzyme

The compound used to distinguish the ethyne and ethene is

Choose an answer

Alkaline KMnO4

Ammonical AgNO3

Bromine water

Tollen's Reagent

The crystal system are of

Choose an answer

7 types

10 types

5 types

8 types

The non polar gases of low polarizability have a very:

Choose an answer

Low critical temperature

Stable critical temperature

High critical temperature

Which of the following shows group IIIB

Choose an answer

Zn, Cd. Hg

Cu. Ag. Au

Sc. Y. La

Ni. Pd. Pt

How many kinds of space lattices are possible in a crystal?

Choose an answer

23

7

230

14

The material possessing superconducting properties is

Choose an answer

Yb Ba₂ Cu₂ O₈

Hg Be₂ Ca₂ Cu₂ O₈

Y Ba₂ Cu₃ O₇

Y B₂ Cu₃ O₇

Which compound shows the highest melting point

Choose an answer

water

Propanoic acid

Methanoic acid

Ethanoic acid

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

The conversion of tertiary alcohols into alkenes in the presence of K2Cr2O7 + H2SO4 is

Choose an answer

Addition reaction

C-H bond cleavage

Elimination reaction

Combustion reaction

Glass is a

Choose an answer

Micro-crystalline solid

Super-cooled liquid

Gel

Polymeric mixture

The solid particles posses only ______ kinetic energy

Choose an answer

Translational

Rotational

Viberational

Circular

In a closed vessel a gas is heated from 300 K to 600K The kinetic energy becomes remains

Choose an answer

Double

Same

Half

Four times

For an ideal gas,number of moles per litre in terms of its pressure P,gas constant R and temperature T is

Choose an answer

PT/R

PRT

P/RT

RT/P

Which of the following metal does not liberate hydrogen on reaction with acid?

Choose an answer

Mg

Pt

Zn

Ca

The spreading of ink on blotting paper is due to

Choose an answer

capillary action

hydrogen bonding

intermolecular forces of the ink

intermolecular forces of the ink and paper

The solubility of A2B3 is X mole dm-3. Its Ksp is?

Choose an answer

6X(5)

36X(5)

64X(5)

108X(5)

Pyridine is an example af

Choose an answer

Homocyclic compound

Heterocyclic compound

Carbocyclic compound

Aliphatic compound

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

Variable Oxidation state of is related to transition elements

Choose an answer

empty d-subshells

Completely filled

Partially filled d-subshell

d-d transition

An example of regulatory protein is

Choose an answer

nucleoprotein

hemoglobin

lactoglobulin

thyroxine

Which is the least reactive of all the alkali metals

Choose an answer

Li

Na

K

Cs

Choose the gas law which gives relationship between volume and pressure:

Choose an answer

Bolye,s law

Graham,s law

Dalton,s law

Charles,s law

Which element of group V-A and VII-A does not use d-orbital?

Choose an answer

Nitrogen

Sulphur

Arsenic

Chlorine

Number of moles present in 0.6 gram of silica is (Atomic mass Si = 28, O=16)

Choose an answer

0.01 mole

0.064 mole

0.044 mole

0.054 mole

When 2-bromobutane reacts with alcoholic KOH, the reaction is called

Choose an answer

Chlorination

Halogenation

Dehydrohalogenation

Hydrogenation

The general electronic configuration of group IV-A elements is

Choose an answer

ns2, np6

ns2, np4

ns2, np3

ns2, np2

Which of the following gases have lowest density at room temperature

Choose an answer

CO

N₂

Ne

NH₃

Polarizability is responsible for intermolecular forces and it

Choose an answer

increases down the group

decreases down the group

almost remains the same

increased along a period

covalent network of crystals has:

Choose an answer

lower melting point than molecular crystals

higher melting point than molecular crystals

H-bonding

Oxygen molecule is 16 times heavier than:

Choose an answer

Helium

Hydrogen

Neon

Aluminium

A molecule which contains two lone pairs and two bond pairs of electrons in valence shell of central atom, geometrical shape of molecules will be

Choose an answer

Tetrahedral

Trigonal pyramidal

Angular

Linear

About 25% of earth crust mass is made up of element

Choose an answer

Oxygen

Silicon

Aluminium

Aluminates

The oxidation state of transition elements is usually

Choose an answer

Variable

Single

Constant

Infinite

Which of the following belongs to alkaline earth metals

Choose an answer

Cu

Zn

Sn

Mg

In the transition state of S2 mechanism reaction with alkyl halides, which of the following orbital hybridization is involved

Choose an answer

sp³

sp

sp²

dsp³

The molecules of CO₂is dry ice form the

Choose an answer

ionic crystals

covalent crystals

molecular crystals

any type of crystal

The curve which is obtain from Boyle's law is called as

Choose an answer

Isochoric

Isotherm

Adiabatic

All of these

Which order of vapour pressure in the following liquids is correct

Choose an answer

water > ethanol > acetone > ether

ether > acetone > ethanol > water

ether > ethanol > acetone > water

water > ether > acetone > ethanol

Keeping in view different factors which affect the melting point of a substance.the compound having melting point among the following is:

Choose an answer

LiCl

NaCl

CsCl

RbCl

Which of the following are responsible for the colour developed in transition elements compounds?

Choose an answer

s-orbitals

p-orbitals

d-orbitals

f-orbitals

Velaric acid is obtained from a herb velarian, its IUPAC name is

Choose an answer

Propionic acid

Pentanoic acid

Butyric acid

Caporic acid

Instantaneous dipole-induced dipole forces are also known as:

Choose an answer

dipole-dipole interactions

hydrogen bonds

covlent bonds

Van der Waals forces

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

Choose an answer

Methyl alcohol

Acetaldehyde

Ethyl alcohol

Acetone

In graphite crystal, carbon is

Choose an answer

sp hybridized

sp²hybridized

sp³hybridized

None

A substances has M_r74.5, a melting point of 772°C and a boiling point of 1407°C. It conducts electricity only when in the liquid state.What is the bonding present in this substances?

Choose an answer

covalent

ionic

metallic

hydrogen bonding

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

London dispersion forces are the only force present among the:

Choose an answer

molecules of water in liquid state

atoms of helium in gaseous state at high temperature

molecules of solid iodine

molecules of hydrogen chloride gas

The densities of two gases are in the ratio of 1 : 16.The ration of their rates of diffusion is

Choose an answer

16 : 1

4 : 1

1 : 4

1 : 16

Which of the following elements is most metallic

Choose an answer

Bi

sb

As

P

Which of the following is not a correct postulate of the kinetic theory of gases

Choose an answer

the gas molecules are in random motion

the collision between the molecules are perfectly elastic

the average kinetic energies of different gases are equal at a particular temperature

the pressure exerted on the walls of the container is due to intermolecular forces