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.
