CRT 1 (CBSE 10th)

Which of the following statements about the given reaction are correct?

1. Iron metal is getting oxidized

2. Water is getting reduced

3. Water is acting as reducing agent

4. Water is acting as oxidizing agent

• 1, 2 and 3

• 3 and 4

• 1, 2 and 4

• 2 and 4

Which of the following are exothermic processes?

1. Reaction of water with quick lime

2. Dilution of an acid

3. Evaporation of water

4. Sublimation of camphor (crystals)

• 1 and 2

• 2 and 3

• 1 and 4

• 3 and 4

Which among the following is (are) double displacement reaction(s)?

• (i) and (iv)

• (ii)

• (i) and (ii)

• (iii) and (iv)

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

• 1 : 1

• 2 : 1

• 4 : 1

• 1 : 2

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?

• Lead sulphate (insoluble)

• Lead acetate

• Ammonium nitrate

• Potassium sulphate

Which among the following changes are exothermic or endothermic in nature?

• Decomposition of ferrous sulphate

• Dilution of sulphuric acid

• Dissolution of sodium hydroxide in water

• Dissolution of ammonium chloride in water

Which among the following are physical changes?

(multi correct question)

• Evaporation of petrol

• Burning of Liquefied Petroleum Gas (LPG)

• Heating of an iron rod to red hot

• Curdling of milk

It is necessary to balance a chemical equation in order to satisfy the law of:

• Conservation of motion

• Conservation of momentum

• Conservation of energy

• Conservation of mass

Rusting of iron involves a chemical reaction which is a combination of:

• Reduction as well as combination reactions

• Oxidation as well as combination reactions

• Reduction as well as displacement reactions

• Oxidation as well as displacement reactions

When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in colour from:

• Blue to green.

• Green to blue.

• Green to brown.

• Green to yellow.