- AEnantiomers
- BMesomers
- CTautomers
- ✓Diastereoisomers
$\mathop {\mathop {H - \mathop C\limits_|^| - OH}\limits_{H - \mathop C\limits_| - OH}^{\;\;\;\;\;COOH} }\limits_{\;\;\;\;COOH} $ and $\mathop {\mathop {H - \mathop C\limits_|^| - OH}\limits_{HO - \mathop C\limits_| - H\;\;\;\,}^{\;\;\;\;\;COOH} }\limits_{\;\;\;\;COOH} $
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Precipitate $X$ is
$(A)$ $Fe _4\left[ Fe ( CN )_6\right]_3$
$(B)$ $Fe \left[ Fe ( CN )_6\right]$
$(C)$ $K _2 Fe \left[ Fe ( CN )_6\right]$
$(D)$ $KFe \left[ Fe ( CN )_6\right]$
Among the following, the brown ring is due to the formation of
$(A)$ $\left[ Fe ( NO )_2\left( SO _4\right)_2\right]^{2-}$
$(B)$ $\left[ Fe ( NO )_2\left( H _2 O \right)_4\right]^{3+}$
$(C)$ $\left[ Fe ( NO )_4\left( SO _4\right)_2\right]$
$(D)$ $\left[ Fe ( NO )\left( H _2 O \right)_5\right]^{2+}$

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.