IGCSE Chemistry Paper-1: Specimen Questions with Answers 27 - 28 of 99

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Question 27

Question

MCQ▾

The chemical formulae of two substances, W and X, are given.

W NaAl Si3O8

X CaAl2Si2O8

Which statements are correct?

1 W and X contain the same amount of oxygen.

2 W contains three times as much silicon as X.

3 X contains twice as much aluminium as W.

Choices

Choice (4)

a.

2 and 3

b.

1 and 2

c.

1 and 3

d.

1,2 and 3

Answer

c.

Explanation

It can be seen that both the substance contains same amount of Oxygen i.e. O8 and W have one Al atom whereas X have 2.

Question 28

Question

MCQ▾

Which diagram does not show the outer shell electrons in the molecule correctly?

Choices

Choice (4)

a.

No Outer Shell Electrons in the Molecule Are Depicted – Choice A

b.

No Outer Shell Electrons in the Molecule Are Depicted – Choice B

c.

No Outer Shell Electrons in the Molecule Are Depicted – Choice C

d.

No Outer Shell Electrons in the Molecule Are Depicted Choice D

Answer

d.

Explanation

As we know the atomic no of chlorine is 17

Electronic configuration will be 2,8, 7 . That means 7 electrons will be there in the outer most shell of the atom. In figure 4 one Cl satisfies the no of electrons whereas the other has only one left in the outer most shell.

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