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Chemistry Past Questions and Answers

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Chemistry Questions

Question 121:

Which of the following contains two amphoteric oxides?

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A Sodium oxide, Zinc oxide , Magnesium oxide
B Aluminium oxide, Calcium oxide, Zinc oxide
C Potassium oxide, Lithium oxide, Carbon monoxide
D Silver oxide, Lead oxide, Sodium oxide
E Sulphur dioxide, Aluminium oxide, Carbon monoxide

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Question 122:

Helium atoms are chemically unreactive because

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A There are no electrons around the nucleus
B The number of protons equals the number of electrons
C There are equal number of protons and neutrons in the nucleus
D The outer electron shell is completely filled
E The atoms contain only protons

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Question 123:

\(50cm^{3}\) of hydrogen are sparked with \(20cm^{3}\) of oxygen at \(100°C\) and \(1atm\) . The total volume of the residual gases in

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A 50 cm³
B 10 cm³
C 40 cm³
D 30 cm³
E 70 cm³

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Question 124:

How many grams of HBr would exactly be required to react with 2 g of propyne? (C =12, H=1, Br = 80)

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A 4. 1 g
B 6. 1 g
C 8. 1g
D 16.2g

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Question 125:

When ammonium, potassium and calcium carbonates are each separately heated

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A None of them will decompose
B Each of them will decompose to give carbondioxide and the respective oxide
C Ammonium carbonate and potassium carbonate will not decompose
D Only ammonium carbonate and the respective oxide
E Ammonium carbonate will decompose to give carbondioxide, water and ammonia

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