Study of Gas Laws
ICSE · Class 9 · Chemistry
Most important questions from Study of Gas Laws for ICSE Class 9 Chemistry board exam 2026. MCQs, short answer, and long answer questions with marks.
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Which of the following are characteristics of gases?
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No fixed shape, No fixed volume, Highly compressible
Gases have no fixed shape or volume, are highly compressible due to large inter-particle spaces, and have low density with particles far apart.
Convert 27°C to Kelvin scale.
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300 K
To convert Celsius to Kelvin, add 273 to the Celsius value. So, 27°C + 273 = 300 K. Kelvin values are written without the degree sign.
At constant pressure, volume of a gas is directly proportional to temperature.
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True
This is Charles's Law - at constant pressure, volume is directly proportional to absolute temperature (V ∝ T).
Standard Temperature and Pressure (STP) conditions are:
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0°C and 760 mm Hg, 273 K and 1 atm, 0°C and 76 cm Hg
Standard temperature and pressure are given in the chapter as 0°C or 273 K for temperature and 1 atmospheric unit (atm) or 760 mm Hg for pressure. Since 1 atm is also equal to 76 cm Hg, that pair is included as well. The other options do not match the standard conditions stated for STP.
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