Equilibrium — JEE Main PYQs

Four species are listed below
i. ${\mathrm{HCO}}_3^{-}$
ii. ${\mathrm{H}}_3{\mathrm{O}}^{+}$
iii. ${\mathrm{HSO}}_4^{-}$
iv. ${\mathrm{HSO}}_3\mathrm{F}$

Which one of the following is the correct sequence of their acid strength?

The ${\mathrm{pK}}_{\mathrm{a}}$ of a weak acid, HA, is 4.80. The ${\mathrm{pK}}_{\mathrm{b}}$ of a weak base, BOH, is 4.78. The pH of an aqueous solution of the corresponding salt, BA, will be

The pKa of a weak acid (HA) is 4.5. The pOH of an aqueous buffered solution of HA in which $50\%$ of the acid is ionized is

In a saturated solution of the sparingly soluble strong electrolyte ${\mathrm{AgIO}}_3$ (Molecular mass $=283$) the equilibrium which sets in is
${\mathrm{AgIO}}_{3(\mathrm{s})}\rightleftharpoons {\mathrm{Ag}}_{(\mathrm{aq})}^{+}+{\mathrm{IO}}_{3(\mathrm{aq})}^{-}$
If the solubility …

The first and second dissociation constants of an acid ${\mathrm{H}}_2\mathrm{A}$ are $1.0\times 10^{-5}$ and $5.0\times 10^{-10}$ respectively. The overall dissociation constant of the acid will be

Phosphorus pentachloride dissociates as follows, in a closed reaction vessel,
${\mathrm{PCl}}_5(\mathrm{g})\rightleftharpoons {\mathrm{PCl}}_3(\mathrm{g})+{\mathrm{Cl}}_2(\mathrm{g})$
If total pressure at equilibrium of the reaction mixture is P and degree of dissociation o …

The equilibrium constant for the reaction

is ${\mathrm{K}}_{\mathrm{c}}=4.9\times 10^{-2}$. The value of ${\mathrm{K}}_{\mathrm{c}}$ for the reaction …

The solubility product of a salt having general formula ${\mathrm{MX}}_2$, in water is: $4\times 10^{-12}$. The concentration of ${\mathrm{M}}^{2+}$ ions in the aqueous solution of the salt is

The exothermic formation of ${\mathrm{ClF}}_3$ is represented by the equation:
${\mathrm{Cl}}_{2(\mathrm{g})}+3{\mathrm{F}}_{2(\mathrm{g})}\rightleftharpoons 2{\mathrm{ClF}}_{3(\mathrm{g})};\Delta \mathrm{rH}=-329\mathrm{kJ}$
Which of the following will increase the quant …

For the reaction
$2{\mathrm{NO}}_{2(\mathrm{g})}\rightleftharpoons 2{\mathrm{NO}}_{(\mathrm{g})}+{\mathrm{O}}_{2(\mathrm{g})}$,
( ${\mathrm{K}}_{\mathrm{c}}=1.8\times 10^{-6}$ at $184^{\circ }$ C )
( $\mathrm{R}=0.0831$ kJ/(mol.K) )
When ${\mathrm{K}}_{\mathrm{p}}$ and …

Hydrogen ion concentration in mol/L in a solution of pH = 5.4 will be

What is the conjugate base of ${\mathrm{OH}}^{-}$?

An amount of solid ${\mathrm{NH}}_4\mathrm{HS}$ is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm . Pressure. Ammonium hydrogen sulphide decomposes to yield ${\mathrm{NH}}_3$ and ${\mathrm{H}}_2\mathrm{S}$ gases in the flask. When the de …

The conjugate base of ${\mathrm{H}}_2{\mathrm{PO}}_4^{-}$ is

To neutralize completely 20 mL of 0.1 M aqueous solution of phosphorous acid $({\mathrm{H}}_3{\mathrm{PO}}_3)$, the volume of 0.1 M aqueous KOH solution required is

What is the equilibrium expression for the reaction ${\mathrm{P}}_{4(\mathrm{s})}+5{\mathrm{O}}_{2(\mathrm{g})}\rightleftharpoons {\mathrm{P}}_4{\mathrm{O}}_{10(\mathrm{s})}$ ?

For the reaction, $\mathrm{CO}(\mathrm{g})+{\mathrm{Cl}}_2(\mathrm{g})\rightleftharpoons {\mathrm{COCl}}_2(\mathrm{g})$ the $\frac{{\mathrm{K}}_{\mathrm{p}}}{{\mathrm{K}}_{\mathrm{c}}}$ is equal to

The equilibrium constant for the reaction ${\mathrm{N}}_2(\mathrm{g})+{\mathrm{O}}_2(\mathrm{g})\rightleftharpoons 2\mathrm{NO}(\mathrm{g})$ at temperature T is $4\times 10^{-4}$. The value of Kc for the reaction …

For a sparingly soluble salt of the type $\mathrm{A}{\mathrm{B}}_4$ (dissociating as $\mathrm{A}{\mathrm{B}}_4\rightleftharpoons {\mathrm{A}}^{4+}+4{\mathrm{B}}^{-}$) whose molar solubility is $s$ and whose solubility product is ${\mathrm{K}}_{\mathrm{sp}}$, the value of $s$ in terms of ${\mathrm{K}}_{\mathrm{sp}}$ is given b …