Assertion :Copper is used to make hot water tanks and not steel (an alloy of iron). Reason: Copper does not react with cold water, hot water or steam. However, iron reacts with steam. If the hot water tanks are made of steel (an alloy of iron), then iron would react vigorously with the steam formed from hot water.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$3 F e + 4 H_{2} O \to {F e}_{3} O_{4} + 4 H_{2} I r o n S t e a m I r o n (I I, I I I) o x i d e H y d r o g e n$
Copper does not react with cold water, hot water or steam. However, Iron reacts with steam. If the hot water tanks are made of steel (an alloy of Iron), then Iron would react vigorously with the steam formed from hot water.

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Question 16

Give reasons why copper is used to make hot water tanks and not steel (an alloy of iron).

{SiO}_{2}

{CaCO}_{3}

CaO

{CaCO}_{3}

{SiO}_{2}

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

Reason: $C a C O_{3}$ which decomposes into $C a O$ and $C O_{2}$ . The $C a O$ formed reacts with $S i O_{2}$ to remove silica

p H

H^{+}

O H^{-}

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