IGCSE Chemistry: Specimen Questions with Answers 84 - 86 of 240

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Question 84

Question

MCQ▾

The relative vapour density is calculated with respect to ________.

Choices

Choice (4)

a.

Carbon

b.

Hydrogen

c.

Oxygen

d.

Nitrogen

Answer

b.

Explanation

The relative vapour density is calculated with respect to hydrogen.

Question 85

Question

MCQ▾

The first chemical basis for classifying acids was given by the scientist named ________.

Choices

Choice (4)

a.

Dalton

b.

Lavoisier

c.

None of the above

d.

Question does not provide sufficient data or is vague

Answer

c.

Explanation

The first chemical basis for classifying acids was given by the scientist named Arrhenius. He said that all those substances that give ions as the only positively charged ions in a solution are acids. As ion is unstable, so it combines with water to form ion. So all those substances that give ions as the only positively charged ions in a solution are acids.

Question 86

Question

MCQ▾

Conditions necessary during Haber process are ________.

Choices

Choice (4)

a.

Presence of molybdenum or iron as a catalyst

b.

High Temperature

c.

All the others

d.

High Pressure

Answer

c.

Explanation

Correct Option is C because haber process cannot be done without Presence of molybdenum or iron as a catalyst, high temperature, high pressure.

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