Question

1gm alloy of Cu and Zn is treated with dilute H2SO4. as a consequence 112 ml of a gaseous product was produced at STP. what is the percentage composition of Cu in alloy



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Answer 1

CHEMISTRY

26 g of an alloy of copper and zinc reacts with H

2

SO

4

releasing 4.48L of H

2

at STP. The percentage of zinc in the alloy is:

A .

10.2%

B .

76.5%

C .

25.5%

D .

48.8%

December 27, 2019

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Soumya Hirani

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ANSWER

Reaction of zinc(in alloy) with sulphuric acid can be written as:

Zn+H

2

SO

4

→ZnSO

4

+H

2

Therefore 22.4 of 4H

2

is produced from = 63.5g of Zn

4.48 of H

2

is produced from = 63.522.4×4.48 = 12.7g of Zn

Weight of alloy = 26g

%age composition of Zn in alloy = 12.726×100

=48.8

answer is D

December 27, 2019

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hope its help plese mark as brainly

hope ots