MCQ
Which of the following is the weakest reducing agent
- A$Zn$
- ✓$Cu$
- C${H_2}$
- D$Li$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$I$ . $Zn +$ conc. $HNO_3$ (hot) $\to Zn(NO_3)_2 + X + H_2O$
$II$. $Zn +$ dil. $HNO_3$ (cold) $\to Zn(NO_3)_2 + Y + H_2O$
Compounds $X$ and $Y$ are respectively
$A : 1s^2\, 2s^2\, 2p^6$
$B : 1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^3$
$C : 1s^2\, 2s^2\, 2p^6\, 3s^2\, 3p^5$
${\left[ {Fe{{\left( {CN} \right)}_6}} \right]^{ - 4}}\xrightarrow{{MnO_4^ - /{H^ + }}}F{e^{ + 3}} + C{O_2} + NO_3^ - $

$A + B \rightleftharpoons C + D$ is $1 \times 10^{-2}$ at $298\, K$ and is
$2$ at $273\, K$. The chemical process resulting in the formation of $C$ and $D$ is