Chemistry Class 10th

If a system attains equilibrium , it shall stay like that for:

A) A short while

B) Until the reactants get used up

C) Forever

D) Forever until the conditions are not changed

At _______ temperature the particles have higher kinetic energy

A) Lower

B) Higher

C) All

D) None

Low temperature causes:

A) Increased reaction

B) Decreased Reaction

C) No Effect on the reaction

D) Increase but sudden decrease in the reaction

Which of the following is important for Equilibrium:

A) Concentration of Reactants and Products

B) Temperature of the System

C) Volume of the system

D) All of the above

Which of the following is mostly extracted from Natural Gas?

A) Oxygen

B) Nitrogen

C) Chlorine

D) Helium

Air is mostly composed of which gas?

A) Nitrogen

B) Oxygen

C) Carbondioxide

D) Helium

The percentage of Nitrogen in the atmosphere is :

A) 20

B) 46

C) 78

D) 84

The percentage of Oxygen in atmosphere is:

A) 14

B) 21

C) 34

D) 73

In Birkland- Eyde Process, Nitrogen produces:

A) Nirates

B) Nitrous Oxide

C) Nitric Acid

D) None of the above

In Haber Process , Nitrogen reacts with:

A) Oxygen

B) Hydrogen

C) Helium

D) CO2

The Product of Haber process is :

A) Ammonia

B) Nitrates

C) Nitric Acid

D) None of the above

Equilibrium state of chemical reaction can be recognized by knowing:

A) Concentration of Reactants

B) Concentration of Products

C) Both A and B

D) None of the above

A catalyst is a substance that changes :

A) Concentration of the Reactants

B) Rate of chemical reaction

C) Concentration of Products

D) Direction of the reaction

While Writing the Equilibrium state, the product side is written as:

A) Denominator

B) Numerator

C) Can be written as both

D) Is not written

While Writing the Equilibrium state, the reactant side is written as:

A) Denominator

B) Numerator

C) Can be written as both

D) Is not written

The Unit of Kc , when the reactants and the products are equal:

A) Moles

B) moles/dm3

C) NA

D) it has no units

Unit of Kc , when the moles of product are greater than reactant:

A) Moles

B) moles/dm3

C) mole-1/dm3

D) has No units

Unit of Kc , when the moles of product are lesser than reactant:

A) Moles

B) moles/dm3

C) mole-1/dm3

D) has No units

Kc can be used to predict which of the following:

A) Direction of the Reaction

B) Extent of the chemical reaction

C) Effect of External conditions on the Position

D) All of the above

The direction of the chemical reaction can be predicted by:

A) Concentration of Reactants

B) Concentration of Products

C) Ratio of Reactants and Products

D) Ratio of Products and Reactants