Revision Exercise

What do all acids and all bases have in common? Explain?

Doctors use a paste of white substance in water to maintain a fractured bone fixed in its place. Identify this substance and write its chemical formula.

A white powdered solid when added to water produces a hissing sound. Identify the compound. How does this compound react with moist hydrogen chloride gas? Write the chemical equation.

_____ is a weak acid.

(A) $\mathrm{HCl}$                   (B) ${\mathrm{H}}_2{\mathrm{SO}}_4$                    (C) ${\mathrm{CH}}_3\mathrm{COOH}$

Enter your correct answer as A, B or C.

Potassium nitrate has $\mathrm{pH}$ value equal to _____.

Washing soda has a chemical formula _____.

(A) ${\mathrm{Na}}_2{\mathrm{CO}}_3.10{\mathrm{H}}_2\mathrm{O}$                        (B) ${\mathrm{Na}}_2{\mathrm{CO}}_3.{\mathrm{H}}_2\mathrm{O}$                      (C) ${\mathrm{Na}}_2{\mathrm{CO}}_3.2{\mathrm{H}}_2\mathrm{O}$

Enter your correct answer as A, B or C.

Plaster of Paris is obtained by heating _____.

Sodium hydroxide + _____ acid $\to$Sodium chloride + Water