Write the chemical formula of the following salts:

• Baking soda
• Bleaching powder
• Washing soda
• Plaster of paris
• Gypsum

Complete the given equation by balancing

${\mathrm{Na}}_2{\mathrm{CO}}_3+{\mathrm{H}}_2\mathrm{O}+{\mathrm{CO}}_2\to$ _____

(A) $3{\mathrm{NaHCO}}_3$             (B) ${\mathrm{NaHCO}}_3$           (C) $2{\mathrm{NaHCO}}_3$

Enter your correct answer as A, B or C.

The formula of washing soda is _____.

(A) ${\mathrm{Na}}_2{\mathrm{CO}}_3.{\mathrm{H}}_2\mathrm{O}$             (B) ${\mathrm{Na}}_2{\mathrm{CO}}_3.10{\mathrm{H}}_2\mathrm{O}$             (C)${\mathrm{Na}}_2{\mathrm{CO}}_3.5{\mathrm{H}}_2\mathrm{O}$

Enter your correct answer as A, B or C.

_____ salt is poisonous, sometimes called sugar of lead.

(A) ${\mathrm{PbO}}_2$             (B)$\mathrm{Pb}({\mathrm{CH}}_3\mathrm{COO}{)}_2$           (C)${\mathrm{PbCO}}_3$

Enter your correct answer as A, B or C.