Equilibrium Tes...

For the reaction $$PCl_{5}(g) \longrightarrow PCl_{3}(g)+Cl_{2}(g)$$

The total number of different kind of buffer obtained during the titration of $${ H }_{ 3 }{ PO }_{ 4 }$$ with NaOH are:- 

Select the correct acid-base equilibrium.

$$HCOOH$$ and $$CH_3COOH$$ solutions have equal $$pH$$. If $$\cfrac{K_1}{K_2}$$ (ratio of ionisation constants of acids) is 4, their molar concentration ratio will be:

At $$90 ^ { \circ } C ,$$ pure water has $$\left[ \mathrm { H } _ { 3 } \mathrm { O } ^ { + } \right] = 10 ^ { - 6 } \mathrm { mol }$$ litre $$^ { - 1 } .$$ The value of $$K _ { w }$$ at $$90 ^ { \circ } \mathrm { C }$$ is:

Which of the following salt solution will act as a buffer?

What will be the effect on the equilibrium constant on increasing temperature, if the reaction neither absorbs heat nor releases heat?

Hydrogen ion concentration of an aqueous solution is $$1 \times 10^{-4}M$$. The solution is diluted with equal volume of water. Hydroxyl ion concentration of the resultant solution in terms of mol $$dm^{-3}$$ is __________.

The dissociation constants for acetic acid  and HCN at $$25^{0}$$C are $$1 . 5 \times 10^{-5}$$  and $$4 . 5 \times 10 ^{-10} $$, respectively. The equilibrium constant for the equilibrium $$CN^{-} + CH_{3}COOH \leftrightharpoons HCN + CH_{3}COO^{-}$$ would be :

$$N_{2} + 3 H_{2} \leftrightharpoons 2NH_{3} $$ $$\quad \Delta H= - 21 . 9 Kcal $$