MCQ
In the dichromate dianion
- A$4\,Cr - O$ bonds are equivalent
- ✓$6\,Cr - O$ bonds are equivalent
- CAll $Cr - O$ bonds are equivalent
- DAll $Cr - O$ bonds are non-equivalent
${\left[ {O \leftarrow \mathop {\mathop {Cr}\limits_ \downarrow ^ \uparrow }\limits_O^O - O - \mathop {\mathop {Cr}\limits_ \downarrow ^ \uparrow }\limits_O^O \to O} \right]^{2 - }}$
$6,$ $Cr - O$ bonds are equivalent.
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$2{H_2}O \rightleftharpoons {H_3}{O^ + } + O{H^ - }$ ,
the value of $\Delta {G^o}$ at $298\,K$ is approximately .......$kJ\,mol^{-1}$
$I . C H_{3}^{+}$ $II.$ $H_{3} O ^{+}$ $III.$ $N H_{3}$ $I V\,\, C H_{3}^{-}$