Some Basic Concepts Of Chemistry Question 200

Question: $ 12g $ of $ Mg $ (at. mass 24) on reacting completely with acid gives hydrogen gas, the volume of which at STP would be [CPMT 1978]

Options:

A) $ 22.4\ L $

B) $ 11.2\ L $

C) $ 44.8\ L $

D) $ 6.1\ L $

Show Answer

Answer:

Correct Answer: B

Solution:

$ Mg+2HCl\to MgCl _2+H _2 $ $ \because $ 24g Mg evolves 22.4L $ H _2 $ at STP
$ \therefore $ 12g Mg evolves $ H _2 $ at STP $ \frac{22.4}{24}\times 12 $

=11.2L at STP.



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