Question # 1

Elements with atomic no .58 to 71 are called.

Choose an answer

Actinides

Lanthanides

Both a and b

None of these

Acid rain has pH less than.

Choose an answer

6

7

7.4

5.6

If reversibe reaction useful for preparing compounds on large scale.

Choose an answer

Yes

No

They are useful only when equilirbium lies far to the left side

They are useful only when equilibrium lies far to the right side

Mass Number is repreented by

Choose an answer

Z

S

A

M

The vertical columns present in the priodic table are called.

Choose an answer

Group

Period

Both a and b

None of these

According to Arrhenius concept acid is a substance which dissociates in aqueious solutin to give.

Choose an answer

Proton

Pair of Electron

Hydrogen Ions

Hydroxide ion

The percentage of ²³⁸ U ₉₂ found in nature.

Choose an answer

97%

0.72%

98%

1.5%

What is the mass of AI in 204 g of aluminium oxide Al₂O₃

Choose an answer

26 g

54 g

108 g

27 g

Uni of electron affinity is.

Choose an answer

k J mol-1

k jmol

pm

Newton

Covalent bond is most commonly found between the elements of group

Choose an answer

1 to 13

16 to 18

13 to 17

15 to 18

If one mole of carbon contains x atoms what is the number of atoms contained in 12 g of Mg.

Choose an answer

1.5 x

0.5 x

x

2x

Natural source of citric acid is:

Choose an answer

Rancid butter

Fats

Lemon

Sour milk

A reaction between an acid and base produce.

Choose an answer

Salt and water

Salt and gas

Salt and acid

Salt and bases

Which vitamin is soluble in water?

Choose an answer

Vitamin A

Vitamin E

Vitamin D

Vitamin C

What is the pOH of Ca(OH)2, 0.02 M Solution.

Choose an answer

1.698

1.397

12.31

12.61

The % age of carbon in coke is

Choose an answer

60

70

90

98

The depletion of which gas results in the death of aquatic life.

Choose an answer

Oxygen

Carbon di oxide

Boath of them

Nome of them

The surface tension of water is:

Choose an answer

very low

moderate

high

zero

A strange bitter smell noticed near photo copier machine is of.

Choose an answer

H₂S

SO₂

O₂

O₃

Gelatin protein is found in.

Choose an answer

Blood

Skin

Heart

Bones

Which one gas is liberated when alkalies react with ammonium salts?

Choose an answer

O₂

CO₂

H₂

NH3

Temporary hardness is because of .

Choose an answer

Ca(HCO₃)₂

CaCO₃

MgCO₃

MgSO₄

The bond order of N2 molecule is.

Choose an answer

1

2

3

4

Which of the following has highest percentage ionic character.

Choose an answer

HCl

HF

HBr

HI

pH of rain water.

Choose an answer

7

Slightly basic

slightly acidic

Highly basic

Which of the following molecules contain six bonding electrons.

Choose an answer

CH4

CO2

BF3

H2S

The net change in a chemical reaction is same whether it takes place directly or indirectly is

Choose an answer

Henry's law

Charles's

Hess's lass

Graham's law

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

Choose an answer

2-unit cells

4-unit cells

Only one unit cell

8-unit cells

What are the SI units of Van der Waal constant 'a'

Choose an answer

atm dm3 mol-2

atm dm6 mol-2

Nm4 mol-2

Nm mol-1

I molar volume of a gas at S.T.P is occupied by

Choose an answer

1 g of gas

6 x 10²³g of gas

22.4 m³of gas

1 gram molecular mass of gas

The standard heat of formation is measured at 1 atmosphere and

Choose an answer

0 ^oC

100 ^oC

293 ^oC

25 ^oC

If we want to change O₂to O₂^-1The electron is to be placed in

Choose an answer

Oxidation number of Cr in a C₂CrO₄ is

Choose an answer

+2

+4

+6

+8

m-choronitro benzene is prepared by

Choose an answer

Nitration of chlorobenzene

Nitration of Benzene

Chlorination of Nitrobenzene

Nitration of m-chlorobenzene

Which is not a calcarious material

Choose an answer

Clay

Limestone

Marble

Chalk

The disease can be eradicated by using pesticides.

Choose an answer

Malaria

Yellow fever

Sleeping sickness

All of these

Out of the elements of group VIA the highest melting and boiling points is shown by the element.

Choose an answer

Te

Se

S

Po

A snake was preserved in a solution and was placed in biology laboratory. The solution is.

Choose an answer

De ionized water

Fehling solution

Formalin

Chloroform

What product is formed by the dry distillation of calcium acetate.

Choose an answer

CH3CH2COOH

CH3COOH

CH3COCH3

CH3CH2CHO

Which compound is the more reactive

Choose an answer

Benzene

Ethene

Ethane

Ethyne

Which one of the following proteins transports oxygen in blood stream.

Choose an answer

Insulin

Albumin

Hemoglobin

Globulin

The gas used in bactericidal lamps is

Choose an answer

Be

Ar

Kr

Xe

The general formula for Alkene having one double bond is

Choose an answer

C_nH_2n+1

C_nH_2n

C_nH_2n-2

C_nH_2n+2

The word paper is derived from the name of which reedy plant

Choose an answer

Rose

Sun flower

Papyrus

Water