Assertion (A) : Group-15-doped crystal o...

Assertion (A) : Group-`15`-doped crystal of `Si` are called `n`-type semiconductors.
Reason (R ) : Neutrons are responsible for the semi-conducting properties.
(a)If both `(A)` and `(R)` are correct, and `(R)` is the correct explanation of `(A)`
(b)If both `(A)` and `(R)` are correct, but `(R)` is not the correct explanation of `(A)`
(c)If `(A)` is correct, but `(R)` is incorrect.
(d)If both `(A)` is incorrect, but `(R)` is correct.

If both `(A)` and `(R)` are correct, and `(R)` is the correct explanation of `(A)`

If both `(A)` and `(R)` are correct, but `(R)` is not the correct explanation of `(A)`

If `(A)` is correct, but `(R)` is incorrect.

If both `(A)` is incorrect, but `(R)` is correct.

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The correct Answer is:

To solve the question, we need to analyze both the assertion (A) and the reason (R) provided. ### Step 1: Analyze the Assertion (A) The assertion states that "Group-15-doped crystal of Si are called n-type semiconductors." - Silicon (Si) has four valence electrons. - When we dope silicon with Group 15 elements (like phosphorus, arsenic), which have five valence electrons, one extra electron is introduced into the silicon lattice. - This extra electron is free to move and contributes to electrical conduction, thus forming an n-type semiconductor. **Conclusion for Step 1**: The assertion (A) is correct. ### Step 2: Analyze the Reason (R) The reason states that "Neutrons are responsible for the semi-conducting properties." - Neutrons are neutral particles found in the nucleus of an atom and do not participate in electrical conduction. - The semiconducting properties arise from the movement of charge carriers, which are electrons (in n-type) or holes (in p-type). - Therefore, neutrons do not play any role in the conduction process. **Conclusion for Step 2**: The reason (R) is incorrect. ### Final Conclusion Based on the analysis: - Assertion (A) is correct. - Reason (R) is incorrect. Thus, the correct answer is (c): If (A) is correct, but (R) is incorrect. ---

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CENGAGE CHEMISTRY ENGLISH-SOLID STATE-Exercises (Assertion-Reasoning)

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Assertion (A) : CsCl crystal, the coordination number of Cs^(o+) ion i...
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Assertion (A) : In sodium chloride crystal, Na^(o+) ions occupy OVs wh...
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STATEMENT -1 : Electrical consuctivity of semi -conductors incresase ...
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Assertion (A) : Group-13-doped crystals of Si are called p-type semico...
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Assertion (A) : Non-stoichiometric compounds are called Bertholide com...
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