How much calcium oxide will be formed on decomposition of $350 g$ of limestone.
(Given: Atomic mass of $C a = 40 u$ )

224 g

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220 g

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196 g

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320 g

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Solution

The correct option is C $196 g$
We know that, $C a C O_{3} h e a t - - \to C a O + C O_{2} (g)$
Molar mass of limestone, $C a C O_{3} = 40 + 12 + 48 = 100 g/mol$
Molar mass of lime, $C a O = 40 + 16 = 56 g/mol$
$∵ 100 g C a C O_{3} produces 56 g C a O$
$∴ 350 g C a C O_{3} produces \frac{56 \times 350}{100} = 196 g C a O$

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