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UPSC CDS 2 2018 GK Paper
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© examsnet.com
Question : 1
Total: 120
Two reactants in a flask at room temperature are producing bubbles of a gas that turn limewater milky. The reactants could be
[2018 CDS-II]
zinc and hydrochloric acid
magnesium carbonate and hydrochloric acid
methane and oxygen
copper and dilute hydrochloric acid
Validate
Solution:
Magnesium carbonate and hydrochloric acid at room temperature produce bubbles of carbon dioxide gas, which turn limewater milky.
The reaction is as follows:
M
g
C
O
3
+
H
C
l
=
M
g
C
l
2
+
H
2
O
+
C
O
2
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