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K and Cs are used in photoelectric cells...

`K` and `Cs` are used in photoelectric cells.
`K` and `Cs` emit electrons on exposure to light.

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 assertion is false but reason is true.

Text Solution

Verified by Experts

The correct Answer is:
a
`K` and `Cs` emit electrons on exposure of light due to low ionisation potential.
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A2Z-S BLOCK ELEMENTS ( GROUP 13 - 14)-Section B - Assertion Reasoning
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  8. Assertion : Solubilities of alkali metal fluorides and carbonates incr...

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  9. Assertion : All alkali metals do not form superoxides as one of the ma...

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  13. Assertion : The crystalline salts of alkaline earth metals contain mor...

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  14. Assertion : Sodium bicarbonate generally precipitates normal carbonate...

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  15. Assertion : The decahydrated form of sodium carbonate on standing in a...

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  16. Assertion : Solution of sodium hydroxide can be stored in a vessel mad...

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  17. Assertion : White precipitate of BaSO(4) is insoluble in water but rea...

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  18. Assertion : The dissolution of alkali metal hydroxides in water is an ...

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  19. Assertion : Potassium is not obtained by the electrolysis of fused KCl...

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