Magnesium reduces the oxide of a metal Y, and Y displaces copper from its salts. Which one of the following is the order of reactivity of the metals starting with the most reactive?
Cu > Y > Mg
Mg > Cu > Y
Mg > Y > Cu
Y > Mg > Cu
Which one of the following oxides can react with potassium hydroxide?
CuO
CaO
FeO
PbO
Which one of the following metal oxides cannot be converted to the metal by heating the oxide together with coke?
Zinc oxide
Iron(II) oxide
Aluminium oxide
Lead (II) oxide
Which one of the following oxides is soluble in both dilute nitric acid and dilute sodium hydroxide solution?
Copper (II) oxide.
Magnesium oxide.
Calcium oxide.
Zinc oxide.
Which one of the following substances does not change its mass when heated?
Sodium chloride
Copper turnings
Manganese ribbon
Potassium chlorate
Which one of the following processes increases the concentration of oxygen in the atmosphere?
Photosynthesis
Fermentation
Decaying of organic matter
Combustion
State whether the following oxides are acidic, basic, neutral or amphoteric.
ZnO
SO2
CuO
CO
An atom of element R, has 12 neutrons and mass number 23. Write the formula of the oxide of R.
The oxides of some elements are listed below.
State the oxides(s) which will react with
(i) acid only.
(ii) alkalis only.
(iii) both acids and alkalis.
Oxygen was prepared from hydrogen peroxide in the presence of manganese (IV) oxide as a catalyst.
(i) Write equation for the reaction that took place.
(ii) State the conditions under which oxygen can be produced from hydrogen peroxide at a fast rate without a catalyst.
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