IGCSE Chemistry: Specimen Questions with Answers 199 - 201 of 240

Question number: 199

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Question

is a:

Choices

Choice (4) Response

a.

Strong base

b.

Weak acid

c.

Weak base

d.

Strong acid

Answer

d.

Explanation

Strong acids completely ionise to produce a high concentration of ions.

being a strong acid, ionises completely to give and ions. As ion is unstable, so it combines with water to form ion.

Question number: 200

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Question

Which property of elements increases across a period of the Periodic Table?

Choices

Choice (4) Response

a.

Tendency to form positive ions

b.

Number of outer shell electrons

c.

Metallic character

d.

Number of electron shells

Answer

c.

Explanation

From right to left across a period, metallic character increases because the attraction between valence electron and the nucleus is weaker, enabling an easier loss of electrons. Metallic character increases as you move down a group because the atomic size is increasing

Question number: 201

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Question

Mass of 28 carbon atoms is equal to the mass of ________ hydrogen atoms.

Choices

Choice (4) Response

a.

333

b.

336

c.

332

d.

334

Answer

b.

Explanation

The atomic mass of carbon is while that of hydrogen is

Thus, mass of

Therefore, the mass of carbon atoms is equal to the mass of 336 hydrogen atoms.