Gases & Solutions
States of Matter
At constant pressure, a sample of helium gas has a volume of 800 ml at 27oC. Calculate the temperature at which the volume will become 20% of its initial volume.
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50mL of each gas A and of gas B takes 150and200 seconds respectively for effusing through a pin hole under the similar conditon. If molecular mass of gas B is 36, then the molecular mass of gas A will be
A person needs a lens of power −5.5 dioptres for correcting his distance vision. For correcting his near vision he needs a lens of power +1.5 dioptre. What is the focal length of the lens required for correcting (i) distance vision, and (ii) near vision?
Equal volumes of oxygen gas and a second gas weigh 1.00 and 2.375 grams respectively under the same experimental conditions. Which of the following is the unknown gas?
A He atom at 300 K is released from the surface of the earth to travel upwards. Assuming that it undergoes no collision with other molecules, how high will it be before coming to the rest?
The human eye can focus objects at different distances by adjusting the focal length of the eye.This is due to:
Why does a small piece of camphor dance about on the water surface?
If P, V, M, T and R are symbols of pressure, volume, molecular weight, temperature and Gas contstant, what is the equation of density of ideal gas
Copper crystallises in fcc with a unit cell length of 361 pm. What is the radius of copper atom?