Question

Assertion: Light is produced in gases in the process of electric discharge through them at high pressure.
Reason: At high pressure electrons of gaseous atoms collide and reach an excited state.
A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If the assertion is true but the reason is false.
D. If assertion and reason both are false.

Answer 1

Hint:To answer this question, we will first verify the accuracy of the supplied assertion and reason statements, and then we will determine whether or not the reason provides the proper justification for the assertion.

Complete step by step solution:
According to the question, we have given an assertion as Light is produced in gases in the process of electric discharge through them at high pressure which is incorrect because the light is produced at very low pressure and high potential difference due to which accelerated electrons collide with the atoms of the gases and in this atoms gets in an excited state and when they came back to their normal state they lose energy in the form of light energy so, the assertion is incorrect and the given reason that at high-pressure electrons of gaseous atoms collide and reach and excited state is also incorrect because phenomenon doesn’t happen at high pressure.

Hence, the correct answer is option D.

Note: It should be remembered that atoms gain energy during the collision with accelerated electrons and get into the excited state and during the transition between two states atoms always lose energy from a higher state to the lower state and vice versa, and this energy is in the form of light energy.