Assertion (A): Silver chloride turns grey when kept in sunlight. Reason (R): Silver chloride undergoes a decomposition reaction by sunlight. MCQ with Answer and Explanation

Question

Assertion (A): Silver chloride turns grey when kept in sunlight. Reason (R): Silver chloride undergoes a decomposition reaction by sunlight.

A. A is true but R is false.

B. A is false but R is true.

C. Both A and R are true and R is the correct explanation of A.

D. Both A and R are true but R is NOT the correct explanation of A.

Answer: Option C

Solution (By JKExamLibrary)

When exposed to sunlight, silver chloride (AgCl) undergoes photolytic decomposition to form silver metal (which is grey) and chlorine gas. The equation is 2AgCl(s) + sunlight → 2Ag(s) + Cl₂(g). Both statements are correct, and the decomposition reaction perfectly explains the color change observed.

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Which of the following isotopes is used in the treatment of blood cancers?

A. Sodium-24

B. Cobalt-60

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Correct Answer: Option B

Explanation:
Cobalt-60 is a radioactive isotope that emits strong gamma radiation. It is widely used in radiotherapy to treat various types of cancers, including blood cancers like leukemia. Iodine-131 is used for thyroid disorders, Carbon-14 for radiocarbon dating, and Sodium-24 for detecting blood clots.

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The metal that is extracted by the electrolytic reduction of its fused salt is:

A. Zinc

B. Sodium

C. Copper

D. Iron

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Correct Answer: Option B

Explanation:
Highly reactive metals (K, Na, Ca, Mg, Al) are extracted by electrolysis of their fused (molten) salts because chemical reducing agents cannot reduce their ores. For sodium, Down's process: electrolysis of molten NaCl with CaCl₂ to lower melting point. Iron is extracted by smelting (blast furnace). Copper and zinc can be extracted by reduction with coke or electrolytic refining of impure metal.

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The metal used in the manufacture of stainless steel is:

A. Zinc

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Correct Answer: Option C

Explanation:
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