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Standard XII

Chemistry

Zone Refining

Assertion :Zo...

Question

Assertion :Zone refining method is used to produce pure metals which are used as semiconductors. Reason: Semiconductors are used in highly pure form.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
In zone refining the impure metal rod is electrically heated till the metal in the heated zone melts. Pure metal is collected at one end of the rod. Repeating the metal with the product obtained each time highly pure metal is obtained.
This method is very useful for producing semiconductor and other metals with high purity.
For example- Germanium, Silicon, Boron, Gallium and Indium.

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Assertion

Lithium sulphate does not form alums.

Reason

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In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct answer out of the following choices.

(a) Assertion and Reason both are correct statements an Reason is correct explanation for Assertion.

(b) Assertion and Reason both are correct satements but Reason is not correct explanation for Assertion.

(d) Assertion is wrong statement but Reason is correct statement.

Assertion (A) Semiconductors are solids with conductivities in the intermediate range from $10^{-} 6 - 10^{4} o h m^{-} 1 m^{-} 1$ .

Reason (R) Intermediate conductivity in semiconductor is due to partially filled valence band.

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