The equilibrium constant, $K$ for the reaction $2{\rm{HI}}\left( {\rm{g}} \right)\;\leftrightharpoons\;{{\rm{H}}_2}\left( {\rm{g}} \right) + {{\rm{I}}_2}\left( {\rm{g}} \right)$ At room temperature is 2.85 and that at $698\;K$, it is $1.4 \times {10^{ - 2}}$. This implies that

${\rm{HI}}$ is less stable than ${{\rm{H}}_2}$ and ${{\rm{I}}_2}$

${\rm{HI}}$ is resonance stabilised

${\rm{HI}}$ is exothermic compound

${\rm{HI}}$ is stable at room temperature

Back to Equilibrium

NEET UG CHEMISTRY MCQ: Equilibrium

1 Easy

1 of 1

Analyzing +4 | -1

The equilibrium constant,

K

for the reaction

2\mathrm{HI}\left( \mathrm{g} \right)\;\leftrightharpoons\;{\mathrm{H}_2}\left( \mathrm{g} \right) + {\mathrm{I}_2}\left( \mathrm{g} \right)

At room temperature is 2.85 and that at

698\;K

, it is

1.4 \times {10^{ - 2}}

. This implies that

View answer and explanation

Correct option: D

\mathrm{HI}

is less stable than

{\mathrm{H}_2}

and

{\mathrm{I}_2}

Option D is correct because the equilibrium constant decreases with increasing temperature, indicating that the reverse reaction (formation of HI) is exothermic, meaning HI is less stable than H2 and I2.

More Questions from Equilibrium

Practice All Chapter MCQs →

Given below are two statements: One is labelled as Assertion A and the other labelled as Reason R.
Assertion A: During the boiling of water having temporary hardness,

Mg{(HC{O_3})_2}

is converted to

MgC{O_3}

.
Reason R The solubility product of

Mg{(OH)_2}

is greater than that of

MgC{O_3}

.
In the light of the above statements, choose the most appropriate answer from the options given below At a certain temperature,

K_{\mathrm{P}}

for the dissociation of solid

\mathrm{CaCO}_3

4.5 \times 10^{-2}

atm and for the reaction

\mathrm{C}(\mathrm{s})+\mathrm{CO}_2(\mathrm{g}) \rightleftharpoons 2 \mathrm{CO}(\mathrm{g}),

the

K_{\mathrm{P}}

value is

2.0 \mathrm{~atm}.

The pressure of carbon monoxide at this temperature, when solid carbon

\mathrm{CaO}

and

\mathrm{CaCO}_3

are mixed together and allowed to attain equilibrium is Phenolphthalein shows … in acid medium. At the state of dynamic equilibrium, for solute

+

solvent

\leftrightharpoons

solution. For

\mathrm{PC}{\mathrm{l}_5}\leftrightharpoons\mathrm{PC}{\mathrm{l}_3} + \mathrm{C}{\mathrm{l}_2}

, initial concentration of each reactant and product is 1 M. If

{K_{\mathrm{eq}}} = 0.41

then Select the

\mathrm{p}{K_a}

value of the strongest acid from the following