IGCSE Chemistry: Specimen Questions with Answers 164 - 166 of 240

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Question 164

Question

MCQ▾

Strontium has ________ shells

Choices

Choice (4)

a.

2

b.

3

c.

4

d.

5

Answer

d.

Explanation

Correct option is D because it has atomic number and electronic configuration having shell.

Question 165

Question

MCQ▾

The diagram shows one period of the Periodic Table

The Diagram Shows One Period of the Periodic Table

Which two elements form acidic oxides?

Choices

Choice (4)

a.

Carbon and Lithium

b.

Carbon and Neon

c.

Carbon and Nitrogen

d.

Nitrogen and Neon

Answer

c.

Explanation

Correct option is C i.e.. nitrogen and carbon because nitrogen forms dinitrogen trioxide, nitrogen dioxide, and nitrogen pentoxide which is acidic in nature. Carbon forms carbon mono oxide which is slightly acidic in nature. Lithium forms oxide but the oxide is basic and neon is noble gas so it do not forms oxide.

Question 166

Question

MCQ▾

The number of oxygen molecules present in of oxygen gas is ________.

(Given that the Relative Atomic Mass of oxygen is )

Choices

Choice (4)

a.

120

b.

110

c.

140

d.

130

Answer

a.

Explanation

Relative

Number of molecules in

atoms of oxygen combine to form a stable oxygen molecule.

Relative

Gram Molecular Mass of a substance is its Relative Molecular Mass expressed in grams.

Thus

Now .

So

So .

Therefore 640 g of oxygen has molecules

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