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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Q. Give reason for the following:
(a) “Electrolysis of molten lead bromide is considered to be a reaction in which oxidation and reduction go side by side, i.e., a redox reaction”.

(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?

Q. I am a highly corrosive, fuming liquid. Put gold or platinum in me, and I will dissolve them, but both my constituent acid will not be able to do so. Who am I?

Q. Why are displacement reactions said to be redox reactions?

Answer the following:

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

(2) What do you observe when H₂S gas is passed through Cadmium Chloride solution? Name the type of reaction.

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

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

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