$Ca + 2C$ $\rightarrow CaC_2$ $\xrightarrow{N_2, \Delta} A$
Compound $(A)$ is used as a/an:

Fluorosis disease is caused due to the reaction of ...... with excess of fluoride in the body.

Alkali metal hydrides react with water to give:

Which of the following pairs will produce the same products upon reaction with water?

Statement $I$: An alloy of lithium and magnesium is used to make aircraft plates.
Statement $II$: The magnesium ions are important for cell-membrane integrity.
In the light of the above statements,choose the correct answer from the options given below.

Which chloride does not exist as hydrate?