NEET Chemistry: Gases questions with solutions

Q1. Avogadro's law shows the relationship between which two variables?

1. Volume and number of moles
2. Pressure and number of moles
3. Volume and pressure
4. Temperature and pressure E. Temperature and number of moles

Answer: Volume and number of moles

Avogadro’s law states that, at constant temperature and pressure, a gas’s volume is directly proportional to the number of moles. So increasing moles increases volume in the same ratio.

Q2. When we inhale helium gas funny sound appear which is due to:

1. high density of helium than air
2. low density of air than helium
3. low density of helium than air
4. reaction between air and helium

Answer: low density of helium than air

Helium is much less dense than air, so sound travels faster through it and the resonant frequencies of the vocal tract increase. That shifts the voice to a higher pitch, creating the funny sound.