Published by:
CGP EDU Academic Team
Published on: August 12, 2026
For the following Assertion and Reason, the correct option is
Assertion
A
: When Cu (II) and sulphide ions are mixed, they react together extremely quickly to give a solid. Reason (R) : The equilibrium constant of 
is: high because the solubility product is low. is false and (R) is true. and (R) are true but (R) is not the explanation for . and (R) are true and (R) is the explanation for . and (R) are false.
is: high because the solubility product is low. is false and (R) is true. and (R) are true but (R) is not the explanation for . and (R) are true and (R) is the explanation for . and (R) are false.
B
Both
C
Both
D
Both
Text Solution
Verified by ExpertsThe correct answer is:
C
value of CuS is very low 
due to low 
value 
ion gets precipitated very quickly even with very low concentration of 
ion
Due to high value of K (equilibrium constant) CuS precipitated quickly.
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