1.
A metal (M) burns with dazzling brilliance in air above 1000C1000\,^\circ\text{C} to give a white powder. The white powder reacts with water to form a white precipitate (P) and a colourless gas (G) with a characteristic smell. The metal (M) dissolves in conc. NaOH\text{NaOH} to liberate another gas (H). (H) may also be obtained on heating (G). Then: