The compound which is used in glass, soap, and paper industries is:

Write balanced chemical equations for the following:
$(i)$ Carbon dioxide gas is passed through lime water.
$(ii)$ $NaOH$ solution is heated with zinc granules.

Dry hydrogen chloride gas does not turn blue litmus red whereas hydrochloric acid does. Give one reason.

In a basic aqueous solution,what happens to the basicity of the solution as the concentration of $[OH^-]$ increases?

Which of the following is a weak acid?

Equal lengths of magnesium ribbon are taken in two test tubes $A$ and $B$. $H_{2}SO_{4}$ is added to test tube $A$ and $H_{2}CO_{3}$ in test tube $B$ in equal amounts.
$(a)$ Identify the test tube showing vigorous reaction.
$(b)$ Give reason to support your answer.
$(c)$ Name the gas liberated in both the test tubes. How will you prove its liberation?