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Team 2
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Score
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seesaw
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star
Double points!
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gift
Win 25 points!
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baam
Lose 25 points!
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15
×
The process of removing impurities from ores to increase the percentage of metal is called
Refining
Concentration
Reduction
Calcination
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15
×
Roasting converts sulphide ores into
Carbonates
Metals
Oxides
Alloys
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15
×
Refining is done to
Convert ores into oxides
Crush ores into powder
Extract ores from the earth
Remove remaining impurities from metals
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15
×
Which of the following is converted into ZnO by roasting
FeâOâ
ZnS
NaCl
CaCOâ
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boom
Lose 50 points!
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fairy
Take points!
5
10
15
20
25
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rocket
Go to first place!
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thief
Give points!
5
10
15
20
25
15
×
The unwanted impurities in ores such as mud sand and rocks are called
Mineral
Gangue
Slag
Alloy
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15
×
The metals obtained after electro-refining are approximately
90% pure
80% pure
99% pure
95% pure
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15
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The by-product formed when impurities combine during smelting is called
Alloy
Slag
Electrode
Gangue
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15
×
Which method is used if the ore and impurities differ in density
Hydraulic washing
Froth floatation
Roasting
Magnetic separation
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15
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Froth floatation is used when
Both substances have the same density
One substance is hydrophilic and the other hydrophobic
The ore is soluble in water
Both substances are magnetic
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15
×
Calcination converts carbonate ores into
Alloys
Oxides
Sulphides
Slags
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banana
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fairy
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5
10
15
20
25
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rocket
Go to first place!
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×
baam
Lose 10 points!
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15
×
Which refining method is used for metals with a low boiling point like mercury
Distillation
Electro-refining
Smelting
Calcination
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15
×
Which of the following is a pure substance made of only one type of atom
Salt water
Air
Oxygen (Oâ)
Sand and iron filings
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15
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In electro-refining the impure metal is connected to the
Anode
Both terminals
Cathode
None of these
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