MCQ
What is the conjugate base of $O{H^ - }$
- A${O_2}$
- B${H_2}O$
- C${O^ - }$
- ✓${O^{2 - }}$
✓
Answer
Correct option: D.
${O^{2 - }}$
(d) $O{H^ - } \to \mathop {{O^{2 - }} + {H^ + }}\limits_{{\rm{Conjugate}}\,{\rm{base}}\,{\rm{of}}\,O{H^ - }} $
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
One mole of $1,2$ -dibromopropane on treatment with $X \,moles$ of $NaNH_2$ followed by treatment with ethyl bromide gave a pentyne. The value of $X$ is
→The de Broglie wavelength of a tennis ball of $60\, g$ moving with a velocity of $10$ meters per second is approximately
→Which of the following is a simple ether
Arrange the following metal complex / compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system.
→(Atomic numbers $Ce =58, Gd =64$ and $Eu =63 .)$
$(a)$ $\left( NH _{4}\right)_{2}\left[ Ce \left( NO _{3}\right)_{6}\right]$
$(b)$ $Gd \left( NO _{3}\right)_{3}$ and
$(c)$ $Eu \left( NO _{3}\right)_{3}$
Answer is :
Bottles containing ${C_6}{H_5}I$ and ${C_6}{H_5}C{H_2}I$ lost their original labels.
→They were labelled $ A$ and $B$ for testing.
$A$ and $ B $ were separately taken in test tubes and boiled with $NaOH$ solution.
The end solution in each tube was made acidic with dilute $HN{O_3}$ and then some $AgN{O_3}$ solution was added.
Substance $B$ give a yellow precipitate.
Which one of the following statements is true for this experiment
Which among the following molecules have $sp^3d$ hybridisation with one lone pair of electrons on the central atom ?
$(i)\, SF_4$ $(ii)\, [PCl_4]^+$
$(iii)\, XeO_2F_2$ $(iv)\, ClOF_3$
→$(i)\, SF_4$ $(ii)\, [PCl_4]^+$
$(iii)\, XeO_2F_2$ $(iv)\, ClOF_3$
The standard electrode potential for the two electrode ${A^ + }/A$ and ${B^ + }/B$ are respectively $0.5$ $V$ and $0.75$ $V$. The $emf$ of the given cell $A\,\,|\,\,{A^ + }(a = 1)\,\,||\,\,{B^ + }(a = 1)\,\,|\,\,B$ will be ........... $\mathrm{V}$
→In the above reaction product $B$ is:
→The half-life of a first order reaction $X \to Y$ , is $100\,\min$. The concentration of $X$ would be reduced to $10\%$ of the initial concentration in .......... $\min$
→$\begin{array}{*{20}{c}}
{C{H_3} - CH - C - O - C{H_3} + 2C{H_3}MgBr\, \to \,A} \\
{||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$
→{C{H_3} - CH - C - O - C{H_3} + 2C{H_3}MgBr\, \to \,A} \\
{||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$
$\xrightarrow[\Delta ]{{{H^ \oplus }}}\,B$
The product $"B"$ is