What is a decrepitation reaction?

Define the following:

Reactants

Select the correct answer from A, B, C, D and E for each statement given below:

The gas obtained when potassium chlorate is heated in the presence of a catalyst.

[A: Hydrogen B: Copper [II] oxide C: Oxygen D: Copper [II] hydroxide E: Ammonia]

What is a chemical reaction? What are the conditions necessary for a chemical reaction?

Select the correct answer from A, B, C, D and E for each statement given below:

The black residue obtained on heating copper carbonate.

[A: Hydrogen B: Copper [II] oxide C: Oxygen D: Copper [II] hydroxide E: Ammonia]

Select the correct answer from A, B, C, D and E for each statement given below:

The basic gas obtained when two gases react in presence of a catalyst & the reaction is exothermic.

[A: Hydrogen B: Copper [II] oxide C: Oxygen D: Copper [II] hydroxide E: Ammonia]

Identify the picture given alongside and answer the following question

Name the type of reaction.

Only one substance is formed after a chemical reaction.

Write the correct answer in the form of A, B, C, D or E for the statement given below:

Select a gas from the following which reacts with oxygen to give a neutral liquid.

[A: Hydrogen    B: Copper [II] oxide    C: Oxygen     D: Copper [II] hydroxide    E: Ammonia]