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Question

A student heats 25g of reactant 'A' with 50g of reactant 'B'. He obtains 50g of product 'C' and recovers 25 g of unreacted 'B'. Which of the following law is confirmed in the following reaction?


A

Law of multiple proportion

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B

Law of constant proportion

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C

Law of conservation of mass and Law of constant proportion

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D

Law of conservation of mass

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Solution

The correct option is C

Law of conservation of mass and Law of constant proportion


First law is Law of definite proportion as follows: Here 25 g of reactant A reacts with 50 g of reactant B to produce 50 g of product C. That means 25 g of A consumes only 25 g of B. The ratio is 1:1. Even if there would have been say 75 g B is present, still only 25 g of B will react with 25 g of A. Or if 10 g of B is present then only 10 g of A will react and remaining 15 g of A will remain unreacted. Second law of is Law of conservation of mass as follows: There is 25 g of A and 50 g of B. That means total 75 g of reactant is present. On product side 50 g of C and 25 g of unreacted B is present. That means total 75 g of produt is present. Hence, the correct option will be "Law of conservation of mass and Law of constant proportion".


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