Question

The diagram given below represents the set up for the laboratory prepration of carbon dioxide gas. Identify A, B and C.

• A. A - Marble chips, B - Dilute $\text{HCl}$, C - ${\text{CO}}_2$
• B. A - Marble chips, B - Dilute $\text{HCl}$, C - ${\text{O}}_2$
• C. A - Dilute $\text{HCl}$, B - Marble chips , C - ${\text{CO}}_2$
• D. A - Dilute $\text{HCl}$, B - Marble chips, C - ${\text{O}}_2$

Answer 1

The correct option is C A - Dilute $\text{HCl}$, B - Marble chips , C - ${\text{CO}}_2$

In the given set up, when dilute hydrochloric acid is poured through thistle funnel on the marble chips (${\text{CaCO}}_3$) in flask the gas is evolved. This gas is collected through the upward displacement of air. The gas evolved is carbon- dioxide. The reaction occurs as follows:

${\text{CaCO}}_3+\text{HCl}\to {\text{CaCl}}_2+{\text{CO}}_2+{\text{H}}_2\text{O}$

Hence, 'A' is Dilute $\text{HCl}$, 'B' is marble chips and 'C' is ${\text{CO}}_2$.