MCQ
Which of the Phosphorus oxoacid can create silver mirror from $AgNO _3$ solution ?
- A$\left( HPO _3\right)_{ n }$
- ✓$H _4 P _2 O _5$
- C$H _4 P _2 O _6$
- D$H _4 P _2 O _7$

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$Ni^{2+} | Ni = -0.25\, V$
$Cu^{2+} | Cu = 0.34\, V$
$Ag^+ | Ag = 0.80\, V$
$Zn^{2+} | Zn = -0.76\, V$
Which of the following reactions under standard condition will not take place in the specified direction
Product will be
$(i)$ $C{H_3}\mathop {\mathop C\limits_{||} }\limits_O - {O^ - }$ $(ii)$ $C{H_3}{O^ - }$
$(iii)$ $C{N^ - }$ $(iv)$ $Image$
is