The volume of a gas is halved and the temperature is unchanged. The pressure of the gas is

this is base don Boyle law

PV = constant at constant temperature

P1V1=P2V2

here the V2 = V1/2

P1 * V1 = P2 * V1/2

P1 * 2 = P2

it mean pressure of gas is doubled

The pressure will get doubled.

Explanation:

On the basis of the ideal gas equation, the pressure relies upon the gas constant, the number of moles, the volume of the gas, and the temperature. In the given case, the temperature is constant, and let us assume that the number of moles is also constant for a specific gas. Thus, the pressure only modifies with the change in volume. According to the equation, PV = nRT or P = nRT / V, the pressure is inversely proportional to the volume, thus, if the volume is reduced, the pressure will also get increase.