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Standard XII

Chemistry

Reactivity with Halogens and Hydrogen (Group 2)

Assertion :Ma...

Question

Assertion :Magnesium is extracted by the electrolysis of fused mixture of $M g {C l}_{2}, N a C l$ and $C a {C l}_{2}$ Reason: Calcium chloride acts as a reducing agent

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 C Assertion is correct but Reason is incorrect
$N a C l$ and $C a {C l}_{2}$ are added to provide conductivity to the electrolyte and also to lower the fusion temperature of anhydrous $M g {C l}_{2}$ .

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ASSERTION: n-Pentane and n-Hexane belong to a homologous series.

REASON: n-Pentane and n-Hexane belong to the same class of hydrocarbons and they differ by a - $C H_{2}$ - group.

Assertion – The non-fusible impurities present in iron ore are removed by $C a C O_{3}$ .

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Assertion (A) Phenols give o-and p-nitrophenol on nitration with conc. $H N O_{3} a n d H_{2} S O_{4}$ mixture.
Reason (R) - OH group in phenol is o-,p-directing.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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Assertion :Magnesium is extracted by the electrolysis of fused mixture of MgCl2,NaCl and CaCl2 Reason: Calcium chloride acts as a reducing agent

The correct option is C Assertion is correct but Reason is incorrectNaCl and CaCl2 are added to provide conductivity to the electrolyte and also to lower the fusion temperature of anhydrous MgCl2.

Assertion :Magnesium is extracted by the electrolysis of fused mixture of $M g {C l}_{2}, N a C l$ and $C a {C l}_{2}$ Reason: Calcium chloride acts as a reducing agent

The correct option is C Assertion is correct but Reason is incorrect
$N a C l$ and $C a {C l}_{2}$ are added to provide conductivity to the electrolyte and also to lower the fusion temperature of anhydrous $M g {C l}_{2}$ .