MCQ
Which is most reactive metal
- ✓$Fe$
- B$Pt$
- C$Ni$
- D$Co$
$Fe\,\xrightarrow[{H_2}O/{H^ + }]{air} \mathop {}\limits_{} \, \mathop {F{e_2}{O_3}.x\,{H_2}O}\limits_{{\rm{Rust}}} $
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Assertion $A:$ $3.1500\,g$ of hydrated oxalic acid dissolved in water to make $250.0\,mL$ solution will result in $0.1\,M$ oxalic acid solution.
Reason $R:$ Molar mass of hydrated oxalic acid is $126\,g\,mol ^{-1}$.
In the light of the above statements, chose the correct answer from the options given below:

$C{H_3} - C{H_2} - \mathop S\limits_{ \bullet \,\, \bullet }^{ \bullet \,\, \bullet } - \mathop C\limits^* {H_2} - C{H_2} - Br\xrightarrow{{HOH}}[X]$
$[X]$ will be :

