MCQ
Which one is oxidising substance
- A${C_2}{H_2}{O_2}$
- B$CO$
- C${H_2}S$
- ✓$C{O_2}$
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$(A)$ Hydrated $Al _2 O _3$ precipitates, when $CO _2$ is bubbled through a solution of sodium aluminate.
$(B)$ Addition of $Na _3 AlF _6$ lowers the melting point of alumina.
$(C)$ $CO _2$ is evolved at the anode during electrolysis.
$(D)$ The cathode is a steel vessel with a lining of carbon.

$A.$ Chlorophyll - Co
$B.$ Water hardness - EDTA
$C.$ Photography $-\left[ Ag ( CN )_2\right]^{-}$
$D.$ Wilkinson catalyst - $\left[\left(P h_3 P\right)_3 R h C l\right]$
$E.$ Chelating ligand - D - Penicillamine
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