Question # 1

Which noble gas is used in mixture used for breathing by divers?

Choose an answer

Ge

Ar

Kr

He

In [Ti (H2O)]3+ which colour is transmitted

Choose an answer

Yellow

Blue and red

Blue and yellow

red and yellow

As gases can adopt the shape of the container so they have

Choose an answer

no fixed shapes

fixed shapes

different shapes

definite shapes

which one of the following statements bout negative ions is incorrect?

Choose an answer

they are also know as anions

they are formed when atoms gain electrons

they are large than the atom from which they were formed

they are smaller than the atom from which they were formed

The Kw. of water at 25 C° is given by

Choose an answer

10(-7)

10(-10)

10(-12)

10(-14)

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

Which alkaline earth metal makes peroxide?

Choose an answer

Ba

Be

Mg

Ca

The minimum temperature recorded by Kelvin scale is:

Choose an answer

273K

373K

Absolute scale is unable

0K to record this temperature

Which one of the following molecules show maximum hydrogen bonding?

Choose an answer

H₂O

H₂Se

H₂S

HF

Partial pressure of gases in a mixture depend upon:

Choose an answer

Number of moles

Number of protons

Number of electrons

Number of neutrons

Which one the following gases is ideal at -200°C?

Choose an answer

N₂

He

both

none

Which of the following is an application of electrochemical series

Choose an answer

Prediction of the feasibility of chemical reaction

Calculation of the cell voltage

Prediction of reaction of metal with dilute acid

All of the above

Doubling the pressure in a liquid phase reaction

Choose an answer

Will double the rex

Will increase the rex

Will decrease the rex

Will not alter the concentration of reactant

Substituted phenyl group are called

Choose an answer

Arene groups

Alkyl groups

Aryl groups

Acyl groups

Which of the following is not molecular crystal

Choose an answer

Sugar

Iodine

Ice

Graphite

Butane has isomeric forms

Choose an answer

3

4

2

1

coordination number of N^a+ in NaC is:

Choose an answer

1

2

4

6

Ethene can give all of the following reactions except

Choose an answer

Addition

Free radical substitution

Hydrohalogenation

Hydration

What does no happen when an ideal gas is heated?

Choose an answer

an increase in the average energy of the gas particles

an expansion in the range of kinetic energies possessed by particles

an increase in the number of molecules with lower energies

a drop in the number of molecules with lower energies

The product of pressure and volume remains constant when temperature and quantity of gas is:

Choose an answer

Zero

Variable

Kept constant

None of above

Boiling point of water remains 100°C although heat is continuous supplied. it is because

Choose an answer

decomposition of water takes place

hydrogen bonding is increased

external atmospheric pressure is not changing

kinetic energy of H₂O molecules is increasing

Glycerine is a polar compound. It boils at 290°C under one atmospheric pressure. It should be distilled under reduced pressure due to reason that

Choose an answer

there are strong intermolecular forces between molecules of glycerine

it decomposes at 290°C

low pressure makes the liquid to boil at high temperature

the reduced pressure decreases the boiing point of liquids

Which of the following is a pseudo solid?

Choose an answer

CaF₂

glass

NaCl

all these

If absolute temperature of a gas is doubled and pressure is reduced to one half, then the volume of the gas will

Choose an answer

remains unchanged

increases unchanged

reduces to 1/4

increases 4 times

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

The mono atomic gases are

Choose an answer

Halogens

Noble gases

6h group elements

Nitrogen and oxygen

2-propanol on oxidation yield

Choose an answer

Propionaldehyde

Propanone

Propanal

Butanal

Absolute temperature is the temperature at which

Choose an answer

All molecular motion ceases

volume becomes zero

Mass becomes zero

None of these

When liquid solute is dissolved in liquid solvent, then the best unit of concentration is?

Choose an answer

% W/W

% W/V

% V/V

%V/W

The geometry of diamonds is

Choose an answer

tetragonal

cubic

rhombohedral

none of these

Solids in which atoms, ions or molecules are not regularly arranged are

Choose an answer

crystalline solid

amorphous solids

liquid crystals

low melting points

For an ideal gas, number of mole in terms of its pressure P, temperature T and gas constant is

Choose an answer

PT/R

PRT

PV/RT

RT/P

Lonic solids are characterized by:

Choose an answer

low melting points

_{good conductivety in solid state}

high vapour pressures

solubility in polar solvents

The reaction which is responsible for the production of electricity in the voltaic cell is

Choose an answer

Hydrolysis

Oxidation

Reduction

Redox

Which of the following contains I mole of the stated particles

Choose an answer

Chlorine molecules in 35.5 g of chlorine gas

Electrons in 1 g of hydrogen gas

Hydrogen ions in 1 dm³ of 1 mol dm¯³ aqueous sulfuric acid

Oxygen atoms in 22.4 dm³ of oxygen gas at STP

Which of the following has isomorphous structure

Choose an answer

NaF

S

Sn

N

Total number of valence electrons in phosphonium ion (PH4-) is

Choose an answer

8

9

12

10

The molecules of CO2, in dry ice form the

Choose an answer

covalent crystals

molecular crystals

none of these crystals

ionic crystals

Total number of valence electrons in CH4

Choose an answer

8

9

10

12

Diamond is a bad conductor because

Choose an answer

it has light structure

it has a high density

there are no free electron present in the crystal of diamond to conduct electricity

it transparent to light

In an elimination reaction a more substituted alkene is formed due to the stability associated with

Choose an answer

Free radical

transition state

Activated complex

Carbocation

Ionic solids with defects,contain

Choose an answer

Equal number of cation and anion vacancies

Interstitial anions and anion vacanies

Cation vacancies only

Cation vacancies and interstitial cations

How many allotropic forms are present in carbon?

Choose an answer

Two

Four

Three

Five

One dm³of O₂at STP has mass

Choose an answer

32 g

16 g

4.438 g

1.4383 g

The long chains of amino acids are coiled around one another into a spiral by

Choose an answer

ionic bond

Van der Waal's forces

hydrogen bonding

overlapping of orbitals

In which molecule. all atoms are coplanar?

Choose an answer

CH4

BF3

NH3

PH3

Equal volumes of gases at the same temperature and pressure contain equal number of particles.This statement is direct consequence of

Choose an answer

Perfect gas law

Partial law of volumes

Charle's law

Ideal gas equation

The surface formed by the breakage of a crystal is called _____ plane

Choose an answer

Crystal

Unit

Cleavage

None

If internal energy of the system is increased

Choose an answer

Change in state of the system may occur

Temperature of the system may rise

Chemical reaction may take place

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

Which one is correct about conjugate acid-base concept?

Choose an answer

Conjugate base of a very weak acid is relatively very strong

Conjugate base of a very weak acid is relatively very weak

Conjugate base of a very strong acid is relatively very weak

Both A and C

The compressibility factor of an ideal gas is

Choose an answer

0

1

2

4

The origin ofacidic nature of alkyne is?

Choose an answer

small size of C

Small size of H

polarity of triple bond

sp hybridization

The radioactive disintegration of 238U92 is

Choose an answer

First order

Second order

Third order

Zero order

Rte of evaporation of petrol is greater than that of water at room temperature. This is due to the reason that:

Choose an answer

petrol is an organic compound

water molecules have small size

petrol molecules do not have

petrol molecules have greater size

The diffusion of gasses at absolute zero will be:

Choose an answer

Slightly decrease

unchanged

Slightly increased

Zero

The bond angle between any two sp hybrid orbitals is A.109.28°

Choose an answer

107.09°

120°

90°

80°

In Boyle's law which of the following pair remains constant:

Choose an answer

Temperature and quality of a gas.

Pressure and quality of a gas.

Temperature and pressure.

Temperature and quantity of a gas.

Correct relationship b/w Kc and Kp can be written as

Choose an answer

Kp=, Kc(R)∆n

Kc=Kp (RT)∆n

Kp.= Kc.(RT)∆n

Kp=Kc (R/N)∆n

Which of the following decides the reactivity of alkyl halides?

Choose an answer

C-C bond strength

C-H bond strength

C-X bond strength

Electronegativity difference

The formation of acetic anhydride from acetic acid follows the mechanism

Choose an answer

SN

AN

SE

AE