IGCSE Chemistry: Specimen Questions with Answers 198 - 201 of 240

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Question 198

Question

MCQ▾

In Haber process, the catalyst used is

Choices

Choice (4)

a.

Nickel only

b.

Platinum or palladium

c.

Iron or molybdenum

d.

None of the above

Answer

c.

Explanation

In Haber process, the catalyst used is iron or molybdenum.

Question 199

Question

MCQ▾

is a:

Choices

Choice (4)

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 200

Question

MCQ▾

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

Choices

Choice (4)

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 201

Question

MCQ▾

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

Choices

Choice (4)

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.

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