Which of the following are ionic carbides?

What are the products formed when $AgNO_3$ is heated strongly?

Which compound on heating produces a coloured metal oxide finally?

$A$ metal $M$ and its compound can give the following observable changes in a sequence of reactions: $M$ $\xrightarrow{\text{dilute } HNO_3} \text{Colourless solution}$ $\xrightarrow{\text{aqueous } NaOH} \text{White precipitate}$ $\xrightarrow{\text{excess } NaOH_{(aq)}} \text{Colourless solution}$ $\xrightarrow{H_2S} \text{White precipitate}$. Identify the metal $M$.

What products are formed when $1 \ mol$ of calcium phosphide reacts with an excess of water?

$\underbrace{HgI_2}_{X}$ $\xrightarrow[\text{Sublimation}]{\Delta} \underbrace{HgI_2}_{Y}$ $\xrightarrow[\text{On rubbing}]{\text{Cooling}} \underbrace{HgI_2}_{Z}$