A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.
Correct Answer: D
Solution :
The discharge depends on both pressure of discharge tube and ionisation potential of gas. Since the ionisation potential of different gases are different, hence the discharge in different gases takes place at different potential.
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