The metal-pair that can produce nascent hydrogen in alkaline medium is

The reaction between sodium and water can be made less vigorous by

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

Choose the correct order of density of the alkali metals.

Metals dissolve in liquid ammonia giving coloured solutions which are conducting in nature. The colour of the solution and reason of its conductance is

$NO_2$ is not obtained on heating: