Decomposition Reactions

Q.

A red brown gas is released on heating lead nitrate. It is an example of decomposition reaction.

1. Combination reaction

2. Oxidation reaction

Q. Question 15

The following reaction is used for the preparation of oxygen gas in the laboratory.

$2{\text{KClO}}_3\text{(s)}\stackrel{\text{Heat}}{\to }2\text{KCl (s)}+3{\text{O}}_2\text{(g)}$

Which of the following statement(s) is (are) correct about the reaction?
(a) It is a decomposition reaction and endothermic in nature.
(b) It is a combination reaction.
(c) It is a decomposition reaction and accompanied by release of heat.
(d) It is a photochemical decomposition reaction and exothermic in nature.

Q. ${\text{2Pb(NO}}_3{)}_2\text{(s)}\stackrel{\text{Heat}}{\to }2\text{PbO(s)}+4{\text{NO}}_2\text{(g)}+{\text{O}}_2\text{(g)}$

The reaction given above is example of:

1. combination reaction
2. decomposition reaction
3. endothermic reaction
4. exothermic reaction

Q.

1. (i) and (iii)
2. (i) only
3. (ii) and (iii)
4. (iv) only

Q. Which one of the following reactions is NOT a decomposition reaction?

1. $2\mathrm{AgCl}\left(s\right)\to 2\mathrm{Ag}\left(s\right)+{\mathrm{Cl}}_2\left(g\right)$
2. ${\mathrm{CaCO}}_3\left(s\right)\to \mathrm{CaO}\left(s\right)+{\mathrm{CO}}_2\left(g\right)$
3. $H_2\left(g\right)+{\mathrm{Cl}}_2\left(g\right)\to 2\mathrm{HCl}\left(g\right)$
4. $2H_{2}O\left(l\right)\to 2H_2\left(g\right)+O_2\left(g\right)$

Q.

Take about 2 g of lead nitrate in a boiling tube and heat it, what is the type of this reaction?

Q. A decomposition reaction is generally represented as .

1. $A+B\to \mathrm{AB}$
2. $\mathrm{AB}\to A+B$
3. $\mathrm{AB}+C\to \mathrm{AC}+B$

Q. Decomposition of water into hydrogen and oxygen involves absorption of energy.

1. \N
2. \N

Q. A decomposition reaction involves _________ reactant.