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${Na}_{2} C_{2} O_{4} + conc. H_{2} {SO}_{4} \overset{Warmed}{\to}$ Gases evolved :
Which of the following characteristic (s) is/ are correct regarding gases evolved above?

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It can turn the lime water milky

It can decolourise the acidic ${KMnO}_{4}$ solution

It can burn with blue flame

It can turn the ${PdCl}_{2}$ solution black

answer is A, C, D.

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Detailed Solution

$C_{2} O_{4}^{2 -} \underset{warm}{\overset{C_{2} {HO}_{4}}{⟶}} CO + \frac{{CO}_{2} ↑}{Ca (OH)_{2}} + H_{2} O$ $\to$

${CaCO}_{3}$ milky

${PdCl}_{2} + CO \to {CO}_{2} + {Pd}_{spongy} Black + HCl$ .

Hence , correct option are A, C, D.

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