Equilibrium Tes...

The dissociation constant of an acid HA is $$1 \times 10 ^ { - 5 }$$. The pH of 0.1 molar solution of the acid will be approximately:

The percentage of pyridine $$\left( { C }_{ 5 }{ H }_{ 5 }N \right) $$ that forms pyridinium ion $$\left( { C }_{ 5 }{ H }_{ 5 }{ N }^{ + }H \right) $$ in a 0.10 m aqueous pyridine solution $$\left( K_{ b } \ for\ { C }_{ 5 }{ H }_{ 5 }N=1.7\times { 10 }^{ -9 } \right) $$ is:

Densities of diamond and graphite are 3.5 and 2.3 gm/mL 

In the reaction, $$2SO_{ 2 }(g)\rightleftharpoons 2SO +O_2$$, an inert gas introduced at constant temperature and volume. The dissociation of $$SO$$ is:

A weak acid react with strong base, ionisation constant of weak acid is $${ 10 }^{ -4 }$$. Find out equilibrium constant for this reaction. 

For the reaction: $$ \cfrac {1}{2} N_{2(g)} + \cfrac {1}{2} O_{2(g)}  \leftrightharpoons NO_{2(g)} $$

At $$25^oC,$$ $$K_b$$ for $$BOH=1.0\times10^{-12}.$$  The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be:

Consider the following equilibrium.
Liquid $$\rightleftharpoons$$ Vapour
Which of the following relation is correct?

In the reaction: $$CO\left( g \right) +{ H }_{ 2 }O\left( g \right) \leftrightharpoons { CO }_{ 2 }\left( g \right) +{ H }_{ 2 }\left( g \right) +x\ kJ$$, the equilibrium will shift in the forward direction if:

The self ionisation constant of $$\mathrm { NH } _ { 3 }$$ at $$50 ^ { \circ } \mathrm { C }$$  is given by $$\mathrm { K } _ { \mathrm { NH } _ { 3 } } = \left[ \mathrm { NH } _ { 4 } ^ { + } \right] \left[ \mathrm { NH } _ { 2 } ^ { - } \right] = 10 ^ { - 30 }$$. How many $$N H _ { 2 } ^ { - }$$ ions are present per $$\mathrm { cm } ^ { 3 }$$ of pure liquid $$\mathrm { NH } _ { 3 }$$?