Oxygen gas can be prepared from solid $KMnO_4$ by

Which of the following compounds transforms baking soda into baking powder?

Alkali metals are powerful reducing agents because

The word 'alkali' used for alkali metals indicates:

Which of the following reactions is not involved in the Solvay process?

State True or False:
$(1)$ Half-life of $^{223}Fr$ is $21 \ s$.
$(2)$ $Li^{+}$ has a high hydration enthalpy and therefore its salts are usually hydrated in nature.
$(3)$ Among all the alkali metals,only $Na$ can react with nitrogen of air and form a nitride.
$(4)$ Except $LiF$,other halides of $Li$ are soluble in water.