States of Matte...

'a' moles of $$PCl_5$$, undergoes, the thermal dissociation as: $$PCl_5\rightleftharpoons PCl_3+Cl_2$$, the mole fraction of $$PCl_3$$ at equilibrium is $$0.25$$ and the total pressure is $$2.0$$ atmosphere. The partial pressure of $$Cl_2$$ at equilibrium is?

A open ended mercury manometer is used to measure the pressure exerted by a trapped gas as shown in the figure. Initially manometer shows no difference in mercury level in both columns as shown in figure.
After sparking $$A$$ dissociates according to following reaction 
$$A(g)\longrightarrow B(g)+3C(g)$$
If pressure of Gas $$A$$ decreases to $$0.9atm$$. Then
(Assume temperature to be constant and is $$300K$$)

The two bulbs of volume $$5$$ litre and $$10$$ litre containing an ideal gas at $$9\ atm$$ and $$6\ atm$$ respectively are connected. What is the final pressure in the two bulbs if the temperature remains constant ? 

If the pressure of gas contained in a closed vessel is increased by 0.4% when heated by 1 degree C its initial temperature must be _____

The $$K_p$$ for $$2SO_{2(g)+O_{2(g)}}\rightleftharpoons 2SO_{3(g)}$$ is $$5.0\,atm^{-1}$$.What is the equilibrium partial pressure of $$O_2$$ if the equilibrium pressure of $$SO_2$$ and $$SO_3$$ are equal?

The given diagram shows percentage composition of gases $$P, Q, R$$ and other gases present in air.
Which of the following statements is/ are correct regarding gases $$P, Q$$ and $$R$$?
(i) $$P$$ can be fixed in soil by certain bacteria present in roots of leguminous plants.
(ii) $$P$$ supports combustion whereas $$Q$$ and $$R$$ help in extinguishing fire.
(iii) Plants and animals release $$R$$ in respiration whereas plants use $$Q$$ in photosynthesis.
(iv) $$R$$ entraps sun's heat and makes earth warm and hospitable.

Which one of the following gases is lighter than air?

The molecular weights of $$O_2$$ and $$N_2$$ are $$32$$ and $$28$$ respectively. At $$15^0$$C, the pressure of $$1$$gm $$O_2$$ will be the same as that of $$1$$ gm $$N_2$$ in the same bottle at the temperature:

The molecular weight of $$O_2$$ and $$N_2$$ are 32 and 28 respectively. At $$15^0C$$, the pressure of 1 gm $$O_2$$ will be the same as that of 1 gm $$N_2$$ in the same bottle at the temperature ?

Lowering of vapour pressure in $$2$$ molal aqueous solution at $$373K$$ is____________.