Give suitable reasons for the following- (1). Can displacement reaction be a Redox reaction. (2). Gold and Platinum do not get affected even if there is presence of moist air or acidic gases . Why ? (3). Corrosion of Aluminium is considered to be advantageous.

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(a) Aluminium is a more active metal than iron, but suffers less corrosion. Why?
(b) Explain and give reasons why aluminium vessels should not be cleaned with powders containing alkalis.
(c) Why is the food containing iron salts should not be cooked in aluminium utensils?

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(1) What is the importance of a chemical equation?

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(3) What do you understand by the term “Redox Reactions” Explain with one example.

(4) What is corrosion? Do gold ornaments corrode? Justify.

Q. Assertion :Gold and silver are used to make jewellery. Reason: Gold and silver are highly inactive metals. Therefore, they do not undergo corrosion due to attack by moisture and atmospheric gases.

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