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Q.

Six grams each of magnesium and oxygen were allowed to react. Assuming that the reaction is complete, the mass of MgO formed in the reaction is

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a

21 grams

b

28 grams

c

10 grams

d

42 grams

answer is D.

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Detailed Solution

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        2Mg+ O2→2MgO       2×24g  32g     2×40g given, 6g      6g           ?

Here, Mg is limiting reagent

The mass of MgO formed= 648×2×40=10gm

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