Which of the following is (are) an endothermic processes? 

(i) Dilution of sulphuric acid. 

(ii) Sublimation of dry ice.

(iii) Condensation of water vapours.  

(iv) Evaporation of water. 

Identify the chemical equation which represents a complete balanced equation for the reaction of barium chloride with sodium sulphate to produce barium sulphate and sodium chloride. 

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

$3\mathrm{Fe}\left(\mathrm{s}\right)+4{\mathrm{H}}_2\mathrm{O}\left(\mathrm{g}\right)\to {\mathrm{Fe}}_3{\mathrm{O}}_4\left(\mathrm{s}\right)+4{\mathrm{H}}_2\left(\mathrm{g}\right)$

(i) Iron metal is getting oxidised. 

(ii) Water is getting reduced. 

(iii) Water is acting as a reducing agent. 

(iv) Water is acting as an oxidising agent. 

White silver chloride turns to grey in sunlight because of the formation of silver metal along with the evolution of chlorine gas. Identify the chemical equation that gives a correct representation of the process.

The balanced chemical equation for the reaction of nitrogen with hydrogen to produce ammonia gas is

Which of the following reactions is a combination reaction?

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

$2{\mathrm{KClO}}_3\left(\mathrm{s}\right)\underset{\mathrm{Catalyst}}{\overset{\mathrm{Heat}}{\to }}2\mathrm{KCl}\left(\mathrm{s}\right)+3{\mathrm{O}}_2\left(\mathrm{g}\right)$

Which of the following statement(s) is (are) correct about the reaction? 

Identify the chemical equation that correctly represents the production of magnesium nitride by burning magnesium metal in a pure nitrogen atmosphere from the following: