$10\,{\rm{mL}}$ of a solution contains $0.1\,M\,{\rm{N}}{{\rm{H}}_4}{\rm{Cl}} + 0.01\,M\,{\rm{N}}{{\rm{H}}_4}{\rm{OH}}{\rm{.}}$ Which addition would not change the ${\rm{pH}}$ of the solution?

Adding $5\,{\rm{mL}}$ of$ 0.1\,M\,{\rm{N}}{{\rm{H}}_4}{\rm{Cl}}$

Adding $5\,{\rm{mL}}$ of $0.1\,M\,{\rm{N}}{{\rm{H}}_4}{\rm{OH}}$

Adding$10\,{\rm{mL}}$ of $0.1\,M\,{\rm{N}}{{\rm{H}}_4}{\rm{Cl}}$

NEET UG CHEMISTRY MCQ: Equilibrium

1 Easy

1 of 1

Analyzing +4 | -1

10\,\mathrm{mL}

of a solution contains

0.1\,M\,\mathrm{N}{\mathrm{H}_4}\mathrm{Cl} + 0.01\,M\,\mathrm{N}{\mathrm{H}_4}\mathrm{OH}\mathrm{.}

Which addition would not change the

\mathrm{pH}

of the solution?

View answer and explanation

Correct option: A

Adding

1\,\mathrm{mL}

water

Option A (Adding

1\,{\mathrm{mL}

water) is correct because adding water to a buffer solution does not change the ratio of the weak acid/base and its conjugate, thus maintaining the pH.

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