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Standard VIII

Chemistry

Reaction of Metals with Acid

Assertion :In...

Question

Assertion :In alkaline version of dry cell, $N H_{4} C l$ is replaced by $K O H$ . Reason: Zinc container does not undergo corrosion in alkaline medium.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In dry cell,
zinc acts as anode and oxidation of zinc takes place,
in basic medium zinc anode corrode less rapidly than in acidic medium
and hence, cell lasts much longer time.

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Assertion

Lithium sulphate does not form alums.

Reason

$L i^{+}$ is too small to form a stable lattice required for double-salt/alum formation.

Assertion (A) Rate constant determined from Arrhenius equation are fairly accurate for simple as well as complex molecules.

Reason (R) Reactant molecules undergo chemical change irrespective of their orientation during collision.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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Assertion :In alkaline version of dry cell, NH4Cl is replaced by KOH. Reason: Zinc container does not undergo corrosion in alkaline medium.

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for AssertionIn dry cell, zinc acts as anode and oxidation of zinc takes place,in basic medium zinc anode corrode less rapidly than in acidic mediumand hence, cell lasts much longer time.

Assertion :In alkaline version of dry cell, $N H_{4} C l$ is replaced by $K O H$ . Reason: Zinc container does not undergo corrosion in alkaline medium.

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
In dry cell,
zinc acts as anode and oxidation of zinc takes place,
in basic medium zinc anode corrode less rapidly than in acidic medium
and hence, cell lasts much longer time.