Question # 1

According to MO theory, the species O⁺₂

Choose an answer

Bond order of 2.5

Three unpaired electrons

Diamagnetic character

Stability lower then O₂

Which is true for an element R present in group 13 of the periodic table?

Choose an answer

It is a gas at room temperature

It has oxidation state of +4

It forms R₂O₃

It forms RX₂

Which of the following statements is most appropriate about effective nuclear charge? It depends upon

Choose an answer

The shielding constant

The atomic number

The charge on the nucleus

Both the nuclear charge and the shielding

2 g of oxygen contains number of atoms equal to that in

Choose an answer

0.5 g of hydrogen

4 g of sulphur

7 g of nitrogen

2.3 g of sodium

Which of the following is not present in RNA?

Choose an answer

Uracil

Thymine

Ribose

Phosphate

The last orbit of argon would have electrons

Choose an answer

8

18

2

6

Enzymes are

Choose an answer

Proteins

Minerals

Oils

Fatty acids

Dolomite has the composition

Choose an answer

KCL.MgCL₂.6H₂O

Na₃AIF₆

CaCO₃.MgCO₃

CaCL₂.MgCl_2.6H₂O

In which molecule carbon atom is sp²hybridized

Choose an answer

CH₄

C2H₄

C₂H₂

None of the above

The percentage of oxygen in NaOH is

Choose an answer

40

60

8

10

Which of the following with aqueous KOH will give acetaldehyde?

Choose an answer

1, 2-Dichloroethane

1, 1-Dichloroethane

Chloroacetic acid

Ethyl chloride

SO₂ and NO₂produce pollution by increasing

Choose an answer

Alkalinity

Acidity

Neutrality

Buffer action

Which of the following possesses the highest melting point?

Choose an answer

Chlorobenzene

o- Dichlorobenzene

m-Dichlorobenzene

p-Dichlorobenzene

The reaction/method that does not give an alkane is

Choose an answer

Catalytic hydrogenation of alkanes

Wurtz reaction

Hydrolysis of alkyl magnesium bromide

Dehydrohalogenation of an alkyl halide.

Al is more reactive than Fe but Al is less easily corroded than Fe because

Choose an answer

It is a noble metal

oxygen forms a protective reaction easily with water

Iron undergoes reaction easily with water

Fe form mono and divalent ions.

All the naturally occurring processes proceed spontaneously in a direction which lead to

Choose an answer

Decrease of entropy

Increase of enthalpy

Increase of free energy

Decrease of free energy

Saturated solution of NaCl on heating becomes

Choose an answer

Super saturated

Unsaturated

Remains saturated

None

The total pressure exerted by a number of non-reacting gases is equal to the sum of partial pressure of the gases under the same conditions is known as

Choose an answer

Boyle's law

Charle's law

Avogadro's law

Dalton's law

Fertililzer are made by

Choose an answer

Nature only

Artificial methods only

Both artificial and natural methods

None of the above

Among alkali metal salts, the lithium salts are the poorest conductors of electricity in aqueous solution because of

Choose an answer

Easy diffusion of Li⁺ions

Lower ability of Li⁺ions to polarize water molecules

Lowest charge to radius ratio

Higher degree of hydration of Li⁺ions

A clathrate may be defined as a

Choose an answer

Cage compound

Liquid crystal

Mixture

Solid solution

More Classes

Other Links

NAT II Biological Science Chemistry MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer