Which of the following releases brown gas on heating?

The aqueous solutions of lithium salts are poor conductors of electricity compared to other alkali metals because of:

Hydroxide of which alkali metal is used in the manufacture of soft soap?

The main oxides formed on combustion of $Li, Na$ and $K$ in excess of air are,respectively:

In what ways does lithium show similarities to magnesium in its chemical behaviour?

An ionic hydride of an alkali metal has significant covalent character and is almost unreactive towards oxygen and chlorine. This is used in the synthesis of other useful hydrides. Write the formula of this hydride. Write its reaction with $Al_2Cl_6$.