Pressure and volume are inversely related. when the pressure on a gas is doubled, what happens to the volume

The volume of the gas will be halved when the pressure on a gas is doubled.

Explanation:

Boyle's Law: This law states that pressure is inversely proportional to the volume of the gas at constant temperature and number of moles.

    (At constant temperature and number of moles)

where,

= initial pressure of gas = p atm

= final pressure of gas = 2p atm

= initial volume of gas = v L

= final volume of gas = ?

Now put all the given values in the above equation, we get the final volume of gas.

Therefore, the volume of the gas will be halved when the pressure on a gas is doubled.

Acid is anything which will give H+ to other species.

Have a look at the equations given.

In A) HCl changes to Cl- by giving its H+ to H2O. So HCl is an acid.

In B) HCO3- changes to H2CO3^2- by accepting H+. It did Not give its H+ rather it takes from other species. So it is not an acid at all.

In C) H2O is just breaking to H+ and OH-. It is not giving H+ to other species. So it is also not an acid in this reaction.

In D) HCOOH is giving its H+ to H2O. So it is also an acid.

So out of all reactions with water. The only two species are acting as acid with water namely HCl and HCOOH.

Out of these two HCl is very strong acid but HCOOH is a weak acid.

So the answer is D