Short Answer TypeState two relevant observation for each of the following;
Ammonium hydroxide solution is added to copper (II) nitrate solution in small quantities and then in excess.
State two relevant observation for each of the following;
Ammonium hydroxide solution is added to zinc nitrate solution in minimum quantities and then in excess.
State two relevant observation for each of the following;
Lead nitrate crystal are heated in a hard glass test tube.
State one appropriate observation for each of the following:
Electricity is passed through molten lead bromide.
|
|
X |
Y |
|
Normal electronic configuration |
2,8,7 |
2,8,2 |
|
Nature of oxide |
Dissolves in water and turns blue litmus red |
Very low solubility in water. Dissolves in hydrochloric acid |
|
Tendency for oxidising and reducing reaction |
Tends to oxidise element and compounds |
Tends to act as a reducing agent |
|
Electrical and thermal conductivity |
Very poor electrical conductor poor thermal conductivity |
Good electrical conductor Good thermal conductor |
|
Tendency to form alloys and amalgums |
No tendency to form alloys |
Forms alloys |
Using the information above, complete the following:
(i) ......... is the metallic element.
(ii) Metal atoms tend to have maximum of ........ electrons in the outermost energy level
(iii) Non-metallic elements tends to form ………. Oxides while metal tends to form ……..oxides.
(iv) Non-metallic elements tend to be ……… conductors of heat and electricity.
(v) Metals tend to ……….. electrons and act as agents in their reactions with element and compounds.
A few drops of dilute hydrochloric acid are added to silver nitrate solution, followed by addition of ammonium hydroxide solution.
Give a chemical test to distinguish between the following pair of compounds:
Hydrogen chloride gas and hydrogen sulphide gas.
Identify the following substance which is underlined:
A gas which does not conduct electricity in the liquid state but conducts electricity when dissolved in water.
State one appropriate to observation for each of the following:
Excess of chlorine gas is reacted with ammonia gas.
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