MCQ
Boric acid is an acid because its molecule
- ✓accepts $OH^-$ from water
- Bcombines with proton from water molecule
- Ccontains replaceable $H^+$ ion
- Dgives up a proton
✓
Answer
Correct option: A.
accepts $OH^-$ from water
a
$B(OH)_3 + OH^-\to [B(OH)_4]^-$
$B(OH)_3 + OH^-\to [B(OH)_4]^-$
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
In spectro chemical series, the positions occupied by the ligands $Cl^-, OH^-, CN^-$ in the increasing splitting power is
→For the reaction
→$C _{2} H _{6} \rightarrow C _{2} H _{4}+ H _{2}$
the reaction enthalpy $\Delta_{ r } H =...........{ kJ\, mol ^{-1}}$.
(Round off to the Nearest Integer).
[Given : Bond enthalpies in $kJ$ $mol$ $^{-1}:C-C : 347, C = C : 611 ; C - H : 414, H - H : 436]$
Consider the following four elements which are represented according to long form of periodic table- Here $W, Y$ and $Z$ are left, up and right elements with respect to the element $'X'\,'Y'$ belongs to $16^{th}$ group and $2^{nd}$ period. Then according to given information the incorrect statement regarding given element is
→Nernst equation is related with
Assertion : Alkylbenzene is not prepared by Friedel-Crafts alkylation of benzene.
Reason : Alkyl halides are less reactive than acyl halides.
Reason : Alkyl halides are less reactive than acyl halides.
Coal tar is main source of
The number of incorrect statement $/ s$ about the black body from the following is $........$.
→$(A)$ Emit or absorb energy in the form of electromagnetic radiation
$(B)$ Frequency distribution of the emitted radiation depends on temperature
$(C)$ At a given temperature, intensity vs frequency curve passes through a maximum value
$(D)$ The maximum of the intensity vs frequency curve is at a higher frequency at higher temperature compared to that at lower temperature
Assertion : $DNA$ as well as $RNA$ molecules are found in the nucleus of a cell.
Reason : On heating, the enzymes do not lose their specific activity.
→Reason : On heating, the enzymes do not lose their specific activity.
What is the relation between given compounds
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
→