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Question: **Assertion:** Copper is used to make hot water tanks and not steel. Reason: Copper is a better co...

Assertion: Copper is used to make hot water tanks and not steel.
Reason: Copper is a better conductor of heat than steel and it is fairly resistant to corrosion than steel.
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is NOT the correct explanation of Assertion.
(c) Assertion is true but Reason is false.
(d) Assertion is false but Reason is true.

Explanation

Solution

Copper is a metal having good conductor of heat and electricity and Steel is an alloy of Iron as the main constituent, less than two percent of carbon and little amount of manganese, silicon, oxygen, phosphorus and sulphur.

Complete step-by-step answer: We start with the assertion and then verifying the reason:
Assertion states that Copper is used to make hot water tanks and steel is not used.
As steel is an alloy of having Iron and Iron is highly reactive to steam formed from hot water and leads to Rusting of Iron. Copper is not reactive to any form of water, not of steam, neither cold water nor hot water. Hence, the Copper does not react with the water it is used to make the hot water tanks and due to the presence of Iron in the steel, Steel is not used to make hot water tanks.
Hence, the Assertion is correct.
Now, moving forward to the Reason:
Reason states that Copper is a better conductor of heat than steel and it is fairly resistant to corrosion than steel. As Copper is a metal, it is a very good conductor of heat and also better conductor than Steel. Copper is also fairly resistant to corrosion, because it does not react with water and as in Steel there is presence of Iron which is highly reaction to steam.
Hence, the Reason is also correct and also the correct explanation of Assertion.
Hence, the Assertion and Reason both are correct and also Reason is the correct explanation of the Assertion.

Note: Copper does not react with water because the position of copper is lower than the hydrogen and as the copper is at lower position with comparison to hydrogen. Copper is less reactive than hydrogen and is not able to displace the hydrogen and results into no reaction.