1)

Which option denotes a double displacement reaction?

Class 10 Chemistry

A)

A + B + C

B)

A + B → C

C)

AC + BD → AD + BC

D)

AC + B → AB + C

2)

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

Class 10 Chemistry

A)

2:1

B)

2:11

C)

12:1

D)

2:13

3)

Which of the following is Not True with respect to the neutralisation reaction?

Class 10 Chemistry

A)

Salt is formed

B)

Reaction occurs between an acid and a base

C)

Reactive element displaces less reactive element

D)

Reactants are in gaseous state

4)

In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?

Class 10 Chemistry

A)

Lead sulphate (insoluble)

B)

Lead acetate

C)

Ammonium nitrate

D)

Potassium sulphate

5)

When do you use double arrow in a chemical equation? 

Class 10 Chemistry

A)

When reaction is reversible.

B)

When reaction proceeds in forward direction.

C)

When reversible reaction is at equillibrium.

D)

None of these.