IGCSE Chemistry Paper-1: Specimen Questions with Answers 93 - 94 of 99

Question number: 93

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Question

Locations of elements X, Y, Z, T and U are given in the picture below. Which one of the following statement are false for these elements.

Periodic table – Finding X, Y and Z

Periodic Table – Finding X, Y and Z

I. X is an alkaline metal

II. Z is a halogen

iii. Y is a noble gas

Choices

Choice (4)Response

a.

i) and iii)

b.

ii) and iii)

c.

i) ii) and iii)

d.

Only iii)

Answer

c.

Explanation

From the above table it can be seen that X is in 1A group, therefore it is alkaline metal.

Y belongs to group VIII A. All the noble gases belong to this group. Therefore Y is a noble gas.

The halogen belongs to group VII. Therefore Z is a halogen.

Therefore all the options are correct.

Question number: 94

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Question

Metal oxide when react with an acid forms a salt and water. A metal oxide ZnO (zinc oxide) is reacted with an acid to form ZnSO₄. What could be the acid used.

Metal oxide + Acid Salt + Water

Choices

Choice (4)Response

a.

H₂SO₄

b.

HNO₃

c.

HCl

d.

Question does not provide sufficient data or is vague

Answer

a.

Explanation

Metal oxides react with acid to give a salt and water. Metal replaces hydrogen and products formed are salt and water.

The reaction will be:

ZnO + H₂SO₄ ZnSO₄ + H₂O

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