Metals generally melt at very high temperatures. Amongst the following,the metal with the highest melting point will be $......$

When sodium bicarbonate is heated,the product obtained is:

Which of the following reactions does not liberate a gaseous product?

The following metal ion activates many enzymes,participates in the oxidation of glucose to produce $ATP$,and with $Na^+$,is responsible for the transmission of nerve signals.

Which among the following elements develops noble gas configuration in $+1$ state?

$A$ solution of sodium in liquid ammonia is blue in colour due to