(vii)Consider the following reagents:

1. H₂O₂
2. H₂O
3. MnO₄
4. .MnO₂

Which reagents are involved in the preparation of oxygen gas in the laboratory?

1. I and 2
2. 3 and 4
3. CI and 3
4. 2 and 3
5. I and 4

   Which of the following substances represent a group of acidic oxides?

1. Carbon dioxide, carbon monoxide and sulphur dioxide
2. Sulphur trioxide, nitrogen dioxide and nnitrogen monoxide
3. Carbon dioxide, sulphur dioxide and dinitrogen oxide
4. Sulphur trioxide, carbon dioxide and nitrogen dioxide
5. Carbon monoxide, nitrogen oxide and sulphur dioxide.
   

An important property of oxygen which distinguishes it from other gases is that it:

1. Burns and supports combustion
2. Burns but does not support combustion 
3. Neither burns nor supports combustion
4. Supports combustion but does not burn

 Oxygen gas can be produced in a large scale by:

1. condensation of air.
2. condensation of liquefied air.
3. liquefaction of steam.
4. Fractional distillation of liquefied air.
5. evaporation of liquefied air.

Why oxygen differs from other gases?

1. It neither burns nor support combustion.
2. It supports combustion but does not burn.
3. It burns but does not support combustion.
4. It burns and supports combustion.
5. It explodes and support combustion.

The metal nitrate which will NOT give a metal oxide on heating is

1.  calcium nitrate 
2. silver nitrate 
3. lead nitrate 
4. copper nitrate 
5. zinc nitrate.

  When oxygen combines with metals they:

1. Form metallic oxides 
2. Form precipitates 
3. Rust
4. Sublime

9. (a) Differentiate between:

(i) A base and an alkali.

(ii) Atom and isotopes.

(c) In the following reaction, name a reducing agent substance and an oxidizing agent:

CuO₍ s₎ + H 2( g₎ ? Cu ( s₎ + H 2 O ( g)  (3 marks)

4. (a) By giving one reason, explain the following facts.

(i)     During laboratory preparation of oxygen gas, little manganese dioxide is added to hydrogen peroxide

………… ………… ……… …………… 

………… ……… …………… ……………

(ii)  Fish can obtain oxygen for respiration although spend their lives in water.

…………… …………… ……………

 ………………… …….......... ....... ....

(iii) Oxygen gas can be used for welding activities although it does not burn.

……………… ……………… …… 

…………… ……………………… 

 (c) Give two domestic uses of oxygen gas.

(i)     ……………… ……………………… 

(ii)  ……………… ……………………… 

9.Outline six common apparatus used in the laboratory preparation of oxygen gas using hydrogen peroxide.

(b) Outline four uses of oxygen in everyday life situation.

(a) Write the name and chemical formula of two important chemical substances used in the laboratory preparation of oxygen gas. (b) Mention four physical properties of oxygen gas.

(a) Define the following terms:

(i)Oxidation state

(ii)An element .......„

(iii)A compound

(iv)Fainting

4.Gas X can be prepared in the laboratory by the decomposition of hydrogen peroxide.

(a)Identify gas X ..

(b)State three physical properties of Gas X

Mention three chemical properties of gas X. (d) State three uses of gas X.

4.Draw a diagram to show laboratory preparation of oxygen using hydrogen peroxide. In the diagram, label all the compounds and elements involved in the preparation.

 Briefly explain how you would distinguish ordinary air from pure oxygen.

(c) List two chemical properties of oxygen gas.

6.(a) Define the following terms:

(i)Chemistry

(ii)Element

(iii)Catalyst

6. (a) List two classes of oxides. Give one example in each case.