These question consist of two statements each, printed as Assertion and Reason. While answering these questions you are required to choose any one of the following four responses :
For a cell raction ` Zn(s) + Cu^(2+) (aq) rarr Zn^(2+) (aq) + Cu (s)` , at the equilibrium, voltmeter gives zero reading.
At the equilibrium, there is no change in teh concentration of `Cu^(2+)` and `Zn^(2+)` .

Options

A. If both the assertion and reason are true but the reason is the correct explanation of assertion
B. If both the assertion and reason are true but the reason is not the correct explanation of assertion.
C. If the assertion is true but reason is false.
D. If assertion is false but reason is rue

Answer

A

Explanation

` Zn(s) + Cu^(2+) (aq) rarr Zn_(aq)^(2+) + Cu (s)`
An the time passes, the concetation of ` Zn^(2+)` keeps on increasing while the concentration of `Cu^(2+)` keeps on decreasing . At the same time voltage os he cell deeps on decreasing . When there is no cahange in concentration of `Cu^(2+) ` and ` Zn^(2+) ` ions, voltmeter gives zero reading and this .