Why does dry HCl gas not change the colour of the dry litmus paper?

Why is it that the instantaneous rate of a reaction does not change when a part of the reacting solution is taken out?

Why does molarity of a solution change with temperature?

What changes will you observe if you test soap with litmus paper (red and blue)?

Why does a gas exert pressure on the wall of its container?What are the two factors on which this pressure depends?

Why does a gas not posses a single specific heat? Explain why C_p' is greater than C_v ?

Why does a dry cell become dead after a long time even if it has not been used?