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SSC CGL
mediumQ. No. 14869

According to Boyle's law, how are pressure and volume related at constant temperature?

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Boyle’s law states that, for a fixed amount of gas at constant temperature, pressure is inversely proportional to volume. If the volume is reduced to half while temperature and the number of gas molecules remain unchanged, the pressure becomes twice as large. The change occurs because gas molecules have less space and collide with the container walls more frequently. Boyle’s law applies most accurately to ideal gases and is a useful approximation for real gases at low pressure. Always check that temperature and amount of gas are constant.

AP is directly proportional to V
BP is inversely proportional to V
CP is independent of V
DP is equal to V
Correct Answer: P is inversely proportional to VYour Answer: B

Explanation

Correct answer: Option B — P is inversely proportional to V. At constant temperature and fixed gas quantity, PV remains constant. Therefore, increasing volume lowers pressure, and decreasing volume raises pressure. Direct proportionality, independence and numerical equality between P and V do not describe Boyle’s law. Option analysis: Direct proportionality would mean pressure and volume increase together, which contradicts compression behaviour. Independence would mean volume changes without any pressure response, and numerical equality P = V is dimensionally meaningless because pressure and volume have different units. Only inverse proportionality describes Boyle's law.

Important Notes

  • At constant temperature, pressure is inversely proportional to volume.
  • Boyle’s law equation is P₁V₁ = P₂V₂.
  • Temperature and amount of gas must remain constant.

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FAQ

SSC CGL Chemistry FAQs

Common questions and clear answers for this topic.

What is Boyle's law formula?

The formula is P₁V₁ = P₂V₂ at constant temperature.

What happens to pressure when volume doubles?

Pressure becomes half if temperature and gas quantity stay constant.

What is the graph of pressure versus volume for Boyle’s law?

A rectangular hyperbola.

What happens to pressure if volume is reduced to one-third?

Pressure becomes three times as large at constant temperature.

How many chemistry questions typically appear in the SSC CGL exam?

Chemistry usually contributes a handful of questions within the General Awareness section, generally covering basic concepts rather than calculation-heavy problems.

Which chemistry topics are most important for SSC CGL preparation?

Atomic structure, periodic table trends, acids-bases-salts, metals and non-metals, and carbon compounds are the areas that appear most consistently across past papers.

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