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If $0.228 \, g$ of silver salt of a dibasic acid gave a residue of $0.162 \, g$ of silver on ignition,then the molecular weight of the acid is:

Match the following substances in List-$I$ with their equivalent weights in List-$II$ ($M$ = Formula weight):
List-$I$ (Substance) List-$II$ (Equivalent weight)
$A. Na_2CO_3$ $I. M/5$
$B. KMnO_4 / H^+$ $II. M/3$
$C. K_2Cr_2O_7 / H^+$ $III. M/2$
$D. KMnO_4 / H_2O$ $IV. M/6$

The mass of $500 \, cm^3$ of a gas at $STP$ is $0.581 \, g$. If the gas is a hydrocarbon,what is the gas?

Which of the following properties of an element is not variable?

$2 \ g$ of metal carbonate is neutralized completely by $100 \ mL$ of $0.1 \ N$ $HCl$. The equivalent weight of metal carbonate is:

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