Madhya Pradesh Police Exam Model Paper 5

The Correct Answer is Lime.

• The chemical name of lime is Calcium oxide (CaO).
• Lime is a metal oxide.
• Metal oxides are basic in nature.
• They react with acids to produce salt and water.
• $\mathrm{CaO}+\mathrm{HCI}\to {\mathrm{CaCl}}_2+{\mathrm{H}}_2\mathit{O}$

• The chemical name of marble is calcium carbonate.
• It is an inorganic chemical compound with the chemical formula ${\mathrm{CaCO}}_3$ .
• When an acid reacts with a metal carbonate (or metal hydrogen carbonate), then a salt, carbon dioxide
  gas and water are formed
• ${\mathrm{CaCO}}_3+\mathrm{HCl}\to {\mathrm{CaCl}}_2+{\mathrm{H}}_2\mathrm{O}+{\mathrm{CO}}_2$
• The Chemical Formula for Baking soda is Sodium Bicarbonate.
• When baking soda reacts with acid it produces carbon dioxide.
• ${\mathrm{NaHcO}}_3+\mathrm{HCI}\to \mathrm{NaCI}+{\mathrm{CO}}_2+{\mathrm{H}}_2\mathrm{O}$