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

Question number: 27

MCQ▾

Question

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) Response

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 number: 28

MCQ▾

Question

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

Choices

Choice (4) Response

a.

No outer shell electrons in the molecule are depicted –Choice A

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

Which figure does not depict outer shell electrons

b.

No outer shell electrons in the molecule are depicted –Choice B

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

Which figure does not depict outer shell electrons

c.

No outer shell electrons in the molecule are depicted –Choice C

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

Which figure does not depict outer shell electrons

d.

 No outer shell electrons in the molecule are depicted Choice D

No Outer Shell Electrons in the Molecule Are Depicted Choice D

Which figure does not depict outer shell electrons

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.