Question

Name the following : 1. Opposite of the combination reaction. 2. The substance which increases the rate of reaction.3. The least reactive metsl in nature 4. The most reactive metal in nature.5. The substance used for white-washing the house.

Answer 1

Explanation:

1. In combination reaction two or more substance are combined

2. catalyst

3.

4. alkali metal

5. potassium

Answer 2

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Q. Opposite of combination reaction .

Ans :- The opposite of combination reaction is Decomposition reaction.

★The general form of combination reaction is = A + B => AB

★The general form of decomposition reaction is = AB => A + B

Q. 2. The substance which increase the rate of reaction?

Ans :- Catalyst are those substance which increases the rate of reaction without taking part in reaction.

Q. 3. The least reactive metal in nature?

Ans :- The inert metal which are least reactive in nature are :-

Platinum, silver, gold etc.

Q. 4. The most reactive metal in nature?

Ans :- Francium is the most reactive metal in nature.

Because the reactivity down the group.

Q. 5. The substance which is used for white washing the house.

Ans :- Calcium hydroxide Or slaked lime is used to white washing the house which gives shiny finishes to walls.