How much amount of air can be inspired or expired during normal breathing (in $, l$)?

The pressure of $H_{2}$ required to make the potential of $H_{2}$ electrode zero in pure water at $298 \ K$ is

$A$ vessel is filled with an ideal gas at a pressure of $10 \ atm$ and temperature $27^\circ C$. Half of the mass of the gas is removed from the vessel and the temperature of the remaining gas is increased to $87^\circ C$. Then the pressure of the gas in the vessel will be ...... $atm$.

Consider the set of all triangles $OPQ$ where '$O$' is the origin and $P$,$Q$ are distinct points in the plane with non-negative integral coordinates $(x, y)$ such that $5x + y = 99$. The number of such distinct triangles whose area is a positive integer is:

Which of the following is $NOT$ a ketone body?

Plants that produce seeds but do not bear flowers are classified into which of the following groups?