Question 1
Total removal of the pollutant sulfur dioxide, SO2, is difficult. The quantities emitted from furnace chimneys can be lowered by using desulfurisation plants. The gases are reacted with calcium hydroxide to remove the SO2.
What is the main product formed initially?
Ca(HSO4)2
CaS
CaSO3
CaSO4
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Question 2
Which oxide does not react with cold dilute sodium hydroxide to produce a salt?
Al2O3
P4O10
SO2
SiO2
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Question 3
X is the oxide of a period 3 element. X reacts with water to give an acidic solution.
A solution is prepared by reacting 0.100 g of X with excess water. This solution was neutralised by exactly 25.0 cm3
of 0.100 mol dm-3 sodium hydroxide solution.
What could be the identity of X?
Al2O3
MgO
P4O10
SO3
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Question 4
Which element of the third period requires the least number of moles of oxygen for the complete combustion of 1 mol of the element?
aluminium
magnesium
phosphorus
sodium
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Question 5
Which oxide is insoluble in aqueous sodium hydroxide?
MgO
Al2O3
P4O10
SO2
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Question 6
An element Y reacts according to the following sequence.
What could be element Y?
Al
Ca
Mg
P
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Question 7
Which is the equation for the reaction when steam passes over strongly heated magnesium?
Mg(s) + 2H2O(l) ➔ Mg(OH)2(aq) + H2(g)
Mg(s) + 2H2O(g) ➔ Mg(OH)2(s) + H2(g)
Mg(s) + H2O(l) ➔ MgO(s) + H2(g)
Mg(s) + H2O(g) ➔ MgO(s) + H2(g)
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Question 8
Which products are formed when magnesium reacts with steam?
magnesium hydroxide and hydrogen
magnesium hydroxide and oxygen
magnesium oxide and hydrogen
magnesium oxide and oxygen
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Question 9
Which element forms an ionic oxide that reacts with strong alkalis?
aluminium
magnesium
sodium
sulfur
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