MCQ
Which of the following ions form most stable complex compound[
- ✓$C{u^{ + 2}}$
- B$N{i^{ + 2 }}$
- C$F{e^{ + 2 }}$
- D$M{n^{ + 2 }}$
$M{n^{2 + }} < F{e^{2 + }} < C{o^{2 + }} < N{i^{2 + }} < C{u^{2 + }} < Z{n^{2 + }}$
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$A.$ $Sm ^{2+}$ $B.$ $Ce ^{2+}$ $C.$ $Ce ^{4+}$ $D.$ $Tb ^{4+}$
Choose the most appropriate answer from the options given below :
Assertion $A$ : Boric acid is a weak acid
Reason $R$ : Boric acid is not able to release $H ^{+}$ion on its own. It receives $OH ^{-}$ion from water and releases $H ^{+}$ion.
In the light of the above statements, choose the most appropriate answer from the options given below.
(Molar mass of $\mathrm{H}_3 \mathrm{PO}_4=98 \mathrm{~g} \mathrm{~mol}^{-1}$ )