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10 grams of $C a C O_{3}$ of 50 % impurity gave 2.24 L of $C O_{2}$ at STP

8.7 grams of Pyrolusite sample ( $M n O_{2} 80 %$ pure) on reaction with conc $H C l$ displaced 1.792 L of $C l_{2}$ at STP (Atomic mass $M n = 55$ )

Mixture of 1 mole of $N a_{2} C O_{3}$ and 1 mole of $N a H C O_{3}$ on heating gave 11.2 L $C O_{2}$ at STP.

Both $N a H C O_{3}$ and $N a_{2} C O_{3}$ give $C O_{2}$ on heating

answer is B, C.

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Detailed Solution

1. 5 gr of $C a C O_{3}$ gives 1.12 lit at STP
2. $M n O_{2} + 4 H C l \to M n C l_{2} + C l_{2} + 2 H_{2} O$
(IN 27 SOL: ONLY 2 OPTION m changed to M)

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