1.
Which of the following pairs will give displacement reactions?
A
solution and copper metal
B
solution and aluminium metal
C
solution and silver metal
D
solution and copper metal
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70 practice sets · Page 1 of 4
Which of the following pairs will give displacement reactions?
solution and copper metal
solution and aluminium metal
solution and silver metal
solution and copper metal
Food cans are coated with tin and not with zinc because?
zinc is costlier than tin
zinc has a higher melting point than tin
zinc is more reactive than tin
zinc is less reactive than tin
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
calcium
carbon
silicon
iron
Which of the following methods is suitable for preventing an iron frying pan from rusting?
Applying grease
Applying paint
Applying a coating of zinc
All of the above
Which of the following statements is correct?
All metals are ductile.
All non-metals are ductile.
Generally, metals are ductile.
Some non-metals are ductile.
Which of the following can be beaten into thin sheets?
Zinc
Phosphorous
Sulphur
Oxygen
The process of giving a coating of _____ to copper or brass is called tinning.
Zinc
Copper
Tin
Iron
Iron is galvanized when it is dipped in
Molten zinc
Molten copper
Molten carbon
Molten gold
Corrosion of metals can be prevented when contact between metal and _____is cut off.
Nitrogen
Hydrogen
Oxygen
Carbon
Total world production of iron destroyed by rusting is about
10%
50%
15%
40%
Eating away of metals by water, oxygen and other chemicals is called
Carbonization
Amalgamation
Oxidation
Corrosion
Metal surface reacts with oxygen and the moisture present in air and get coated with
Oxide
Carbonate
Hydroxide
Any of these
Gold is mixed with copper to
Make gold soft
Make gold hard
Make gold more yellowish
Give gold luster
Which of the following is not a heavy metal?
Cu
Hg
Pb
K
Metal which does not react even with steam
Potassium
Iron
Magnesium
Silver
Metals react with water to form oxides or hydroxides and ___
Hydrogen
Oxygen
Carbon dioxide
Carbon monoxide
Metals combine with oxygen to form _______ oxides.
Acidic
Basic
Amphoteric
None
The nonmetal which is a good conductor of electricity is
Silicon
Sulphur
Graphite
Phosphorous
Tungsten is used in electric bulbs because
It is sonorous
It is metallic
It has high tensile strength
It has high density
The metal which is liquid at room temperature is
Hg
Mg
Ag
Mn