MCQ
$pH$ of a solution is $ 5$ . Its hydroxyl ion concentration is
- A$5$
- B$10$
- C${10^{ - 5}}$
- ✓${10^{ - 9}}$
✓
Answer
Correct option: D.
${10^{ - 9}}$
(d) $pH = 5\,\,{\rm{means}}\,\,[{H^ + }] = {10^{ - 5}}$
$pOH = 14 - pH = 14 - 5 = 9$
$[O{H^ - }] = {10^{ - pOH}} = {10^{ - 9}}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The reaction of propene with $H_3O^+$ will proceed with which of the following intermediates ?
→For an exothermic reaction
The energy required to break one mole of $Cl- Cl$ bonds in $Cl_2$ is $242\, kJ \,mol^{- 1}.$ The longest wavelength of light capable of breaking a single $Cl - Cl$ bond is ............ $\mathrm{nm}$
→$(C= 3 \times 10^8 \,ms^{-1}$ and $N_A =6.02 \times mol^{-1}).$
What is the maximum numbers of electrons that can be associated with the following set of quantum numbers?
→$n = 3, l = 1$ and $m = {-1}$
Which has the highest value of ionic radius ?
Write the products of the addition reaction $\,\,\,\,\,>C = C<\,\, + XY \to $
→Appearance of blood red colour, on treatment of the sodium fusion extract of an organic compound with $\mathrm{FeSO}_4$ in presence of concentrated $\mathrm{H}_2 \mathrm{SO}_4$ indicates the presence of element/s
→A solution of sulphur dioxide in water reacts with ${H_2}S$ precipitating sulphur. Here sulphur dioxide acts as
→End product of the reaction is
For the reaction,
→$C(s)\, + \,C{O_2}(g)\, \rightleftharpoons \,2CO(g),$
the partial pressure of $CO_2$ and $CO$ are $2.0$ and $4.0 \,atm$, respectively, at equilibrium. The $k_p$ of the reaction is