Which is NOT a use of zinc?A)sacrificial protection B)galvanising C)making bronze D)making brass
C)bronze-(copper+tin)
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15
Which reaction is used to keep the blast furnace hot?
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eraser
Reset score!
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rocket
Go to first place!
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shark
Other team loses 25 points!
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baam
Lose 25 points!
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lifesaver
Give 15 points!
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shark
Other team loses 25 points!
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fairy
Take points!
5
10
15
20
25
banana
Go to last place!
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15
Most of metals which occur in their native state in nature:A)are very active B)do not form any compound C)are not reactive D)are moderately reactive
C)are not reactive
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20
What are the products formed from the reaction between sodium and cold water?
sodium hydroxide and hydrogen
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20
magnesium + steam â
magnesium oxide + hydrogen (magnesium very slowly with cold water)
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15
Iron is made by burning its ore, hematite. Hematite contains silica. What reacts with this impurity to remove it?
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15
Zinc granules give hydrogen gas when treated with dilute solution of:A)FeO B)HCl C)NaCl D)Ammonia
B) HCl
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15
Covering iron with zinc is called ______________, and the zinc stops the iron from rusting.
galvanisation
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15
What is the percentage of nitrogen in the atmosphere?
78%
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20
What is an alloy?
A mixture of a metal with one or more other elements.
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15
Copper is sometimes used to make cooking utensils.3 of properties of copper are shown below: 1. Good conductor of electricity 2. Corrosion resistant 3. Good conductor of heat .Which of these properties make it good for cooking utensils?
2&3
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15
The ability of metal to be hammered into sheets is called ________.
