1.

Assertion : Electric conduction in gases is possible at normal pressure. Reason : The electricconduction ingases depends only upon the potential difference between the electrodes.

Answer»

If both assertion and reason are ture and the reason is the correct explanation of the assertion.
If both assertion and reason are TRUE but reason is not the correct explanation of the assertion.
If assertion is true but reason both are false.
If assertion is false but reason is true.

Solution :At normal pressure positive ions and electrons liberated by ionisation of gas atoms, DUE to cosmic rays are very small in number and they collide constantly with the gas atoms which are PRESENT in large numbers, and hence are UNABLE to move a long distance under the electric field and soon GET recombined i.e., flow of ions in the gas does not take place.


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