Question

Calcium burns in nitrogen to produce a white powder which dissolves in sufficient water to produce a gas $A$ and an alkaline solution. The solution on exposure to air the produces a thin solid layer of $B$ on the surface. Now that thin layer is peeled off and reacted with sulphuric acid and allowed to cool down and gain its water of hydration}. This compound is heated to $1000K$ to give a black coloured compound $X$ along with an acidic gas ($Y$).
$Y$ in aqueous solution along with $H_{2}S$ turn the solution yellow. Gas $A$ is :

• A. key ingredient for the formation of iodide of millions base
• B. belonging to group zero in analysis of cations
• C. carbon dioxide
• D. sulphur dioxide

Answer 1

Answer: (A), (B)

key ingredient for the formation of iodide of millions base
belonging to group zero in analysis of cations

The key ingredient is $N{H}_3$