ASSESSMENT

Out of sodium hydrogen carbonate, sodium carbonate, Plaster of Paris, bleaching powder and sodium hydroxide, name the compound used for making baking powder.

Out of sodium hydrogen carbonate, sodium carbonate, Plaster of Paris, bleaching powder and sodium hydroxide, name the compound used for making soaps and detergents. Also, write its chemical formula.

Salt is produced by the reaction between an acid and a base. Identify the acid and the base from which ${\mathrm{Na}}_2{\mathrm{SO}}_4$ salts have been formed.

Salt is produced by the reaction between an acid and a base. Identify the acid and the base from which ${\mathrm{NH}}_4\mathrm{Cl}$ salts have been formed.

Salt is produced by the reaction between an acid and a base. Identify the acid and the base from which ${\mathrm{KNO}}_3$ salts have been formed.

Salt is produced by the reaction between an acid and a base. Identify the acid and the base from which $\mathrm{NaCl}$ salts have been formed.

Consider the following salts ${\mathrm{Na}}_2{\mathrm{SO}}_4,{\mathrm{NH}}_4\mathrm{Cl},{\mathrm{KNO}}_3,\mathrm{NaCl}$. Which of the salt has a pH less than $7$. Why?

Solve the crossword puzzle with the help of the given hints.

Across:

$1$. Gas released when a metal carbonate reacts with an acid.

$3$. This indicator gives pinkish red colour in acidic solution.

$10$. Mixture of sodium bicarbonate and tartaric acid to make cakes.

$11$. Common name of dilute solution of acetic acid. 

$13$. This indicator gives magenta pink colour in alkaline solution.

$14$. Acids and bases react to give _____ reaction.

$15$. Plaster of Paris is obtained by heating this substance.

Down:

$1$. The gas released in the process of electrolysis of aqueous sodium chloride.

$2$. Change in colour of litmus in sodium hydroxide solution ($3$ words).

$4$. Chemical name of washing soda.

$5$. Medicine for acidity and indigestion.

$6$. Common name of sodium bicarbonate.

$7$. Change in colour of litmus in hydrochloric acid. ($3$ words) 

$8$. Gas released when an active metal reacts with an acid.

$9$.  Common name of calcium sulphate hemihydrate. 

$12$. Acids and bases react to produce _____ and water.