CIE Chemistry Paper-1: Specimen Questions 93 - 95 of 99
Question number: 93
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.
I. X is an alkaline metal
II. Z is a halogen
iii. Y is a noble gas
i) and iii)
ii) and iii)
i) ii) and iii)
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
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
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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
Question number: 95
Which acid is known as the king of acids?
Sulphuric acid is called the king of chemicals because it has a large number of applications. It finds applications in manufacturing either directly or indirectly. Some of the uses of sulphuric acid are: 1. It is used in the production of lead-acid batteries. 2. It is used for production of fertilizers. 3. It is widely used in chemical labs. 4. It is used in the manufacture of phosphate fertilizers. 5. It is used in petroleum refining. 6. It is used for production of paper.
There are tons of other uses of Sulphuric acid.