70g of a sample of magnesite on treatment with excess of HCl gave 11.2L of CO2 at STP. The percentage purity of the sample is

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Q.

70g of a sample of magnesite on treatment with excess of HCl gave 11.2L of CO₂ at STP. The percentage purity of the sample is

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a

80

b

70

c

60

d

50

answer is C.

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Detailed Solution

${MgCO}_{3} + 2 HCl \to {MgCl}_{2} + H_{2} O + {CO}_{2}$
84gm 2.2.4lit
42gm 11.2lit
$% purity {MgCO}_{3} = \frac{42}{70} \times 100 = 60$

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70g of a sample of magnesite on treatment with excess of HCl gave 11.2L of CO2 at STP. The percentage purity of the sample is