Veera Bala Rastogi and Shalini Mahajan Solutions for Chapter: Acids, Bases and Salts, Exercise 4: PRACTICE TIME

Identify the chemical formula of sulphuric acid.

$$\begin{gathered} \mathrm{A}: {\mathrm{H}}_2{\mathrm{SO}}_4 \\ \mathrm{B}: {\mathrm{H}}_2{\mathrm{SO}}_3 \\ \mathrm{C}: {\mathrm{H}}_{2}S \end{gathered}$$

(Enter your correct answer as $\mathrm{A}, \mathrm{B} \mathrm{or} \mathrm{C}$)

Identify chemical formulae of the following:
Nitric acid

$$\begin{gathered} \mathrm{A}: {\mathrm{H}}_2{\mathrm{SO}}_4 \\ \mathrm{B}: {\mathrm{HNO}}_3 \\ \mathrm{C}: {\mathrm{HNO}}_2 \end{gathered}$$

(Enter your correct answer as $\mathrm{A}, \mathrm{B} \mathrm{or} \mathrm{C}$)

Write the chemical formula of caustic soda.

Identify the chemical formula of sodium bicarbonate.

$$\begin{gathered} \mathrm{A}: {\mathrm{Na}}_2{\mathrm{CO}}_3 \\ \mathrm{B}: {\mathrm{NaHCO}}_3 \\ \mathrm{C}: {\mathrm{HNO}}_2 \end{gathered}$$

(Enter your correct answer as $\mathrm{A}, \mathrm{B} \mathrm{or} \mathrm{C}$)

Which substances turn blue litmus paper red?

Name the salt obtained by the reaction between $\mathrm{HCl}$ and $\mathrm{NaOH}$. (Sodium carbonate/ Sodium bicarbonate/ Sodium chloride)

You were provided with five solutions labelled as A, B, C, D and E to test them with natural indicators, blue and red litmus papers. You noted down your observations in the given table. Think and answer the following question:

Why does a turmeric stain on a white shirt turn red when washed with a soap?