Question

During laboratory preparation, carbon dioxide gas is evolved with brisk effervescence.

• A. True
• B. False

Answer 1

The correct option is A True

• Some marble chips are taken and placed in Woulfe's bottle.
• A thistle funnel with a stopper is fitted in the bottle in such as way that it reaches the bottom of the bottle.
• Through the other mouth of the bottle, a delivery tube is introduced. Now dilute hydrochloric acid is poured onto the marble chips with the help of the thistle funnel.
• The other end of the delivery tube passes into a gas jar.
• Calcium carbonate reacts with dilute hydrochloric acid to form calcium chloride. In this reaction, carbon dioxide gas evolved with brisk effervescence.

$$\begin{gathered} {\mathrm{CaCO}}_3\left(\mathrm{s}\right)+2\mathrm{HCl}\left(\mathrm{aq}\right)\to {\mathrm{CaCl}}_2\left(\mathrm{s}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)\uparrow \\ \mathrm{Calcium}\mathrm{hydrochloric}\mathrm{calcium}\mathrm{water}\mathrm{carbon}\mathrm{dioxide} \\ \mathrm{carbonate}\mathrm{acid}\mathrm{chloride} \end{gathered}$$

Therefore, the given statement is true.