IGCSE Chemistry: Specimen Questions with Answers 222 - 225 of 240

Question number: 222

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MCQ▾

Question

Iron rusts when it reacts with …… ……

Rusting can be prevented by covering the iron with a more reactive metal, such as …… …… Which words correctly complete gaps 1 and 2?

Choices

Choice (4) Response

a.

Image of Iron rust:Choice A

Image of Iron Rust: Choice A

Image of Iron rust: Choice A

b.

Image of Iron rust:Choice B

Image of Iron Rust: Choice B

Image of Iron rust: Choice B

c.

Image of Iron rust:Choice C

Image of Iron Rust: Choice C

Image of Iron rust: Choice C

d.

Image of Iron rust:Choice D

Image of Iron Rust: Choice D

Image of Iron rust: Choice D

Answer

d.

Explanation

Correct option is D because iron rust when it react with oxygen and water and it can be prevented by magnesium not copper better because magnesium is more reactive than copper.

Question number: 223

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Short Answer Question▾

Write in Short

Complete the symbol equation for this reaction.

…….

Explanation

Question number: 224

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MCQ▾

Question

The reactants for Haber process are:

Choices

Choice (4) Response

a.

hydrogen and nitrogen

b.

iron and nitrogen

c.

oxygen and nitrogen

d.

molybdenum and nitrogen

Answer

a.

Explanation

The reactants for Haber process are hydrogen and nitrogen. Under high pressure, in the presence of iron catalyst (molybdenum being the promoter), they react to form ammonia which is then collected by dissolving in water.

Question number: 225

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Short Answer Question▾

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State one use of aluminum other than as an electrical conductor.

…………………………………………………………………………………………………………………….

Explanation

Other than as electrical conductor aluminum is used as Aluminium is used in a huge variety of products including cans, foils, kitchen utensils, window frames, beer kegs and aeroplane parts.