Sodium reacts more vigorously with water than lithium because ....

$A$ person observes the top of a tower from a point $A$ on the ground. The angle of elevation of the tower from this point is $60^{\circ}$. He moves $60 \ m$ in the direction perpendicular to the line joining $A$ and the base of the tower. The angle of elevation of the tower from this new point is $45^{\circ}$. Then,the height of the tower (in metres) is

What is the vital capacity of our lungs?

An oxide of an element is a gas and dissolves in water to give an acidic solution. The element belongs to

Which one of the following reactions occurs at the anode in the Castner process of extracting sodium metal?

Assertion $(A)$: The aqueous solution of $CH_3COONa$ is alkaline in nature. Reason $(R)$: Acetate ion undergoes anionic hydrolysis. The correct answer is