Question

Explain with the help of equation, what happens when:
a) Marble reacts with HCl.
b) Zinc reacts with sodium hydroxide on heating

Answer 1

SOLUTION:- (a)

• When a carbonate and bicarbonate reacts with an acid it forms Salt + CO2 + H2O
• Marble contains Calcium Carbonate, and HCl is acid.
• CaCO3+2HCl ---> CaCl2 + CO2 + H2O

SOLUTION:- (b)

• Not all metals raect with bases, but Zinc and Aluminium react with Sodium Hydroxide (NaOH)
• NaOH is a base which when reacts with zinc forms a compound known as Sodium Zincate (Na2ZnO2) with a release of H2 gas.
• 2NaOH + Zn ------> Na2ZnO2 + H2