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Class 10
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Single Displacement Reaction
Single Displacement Reaction
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1)
An iron nail is placed in a solution of copper sulphate. The nail is taken out after 10 minutes. The nail will be found to be covered with:
Brown deposit
Black deposit
White deposit
Yellow deposit
2)
When iron nails are kept in the solution of copper sulphate, the colour of the solution changes from ______.
green to yellow
blue to green
green to blue
yellow to green
3)
What happens when Cl₂ (g) reacts with KBr(aq)?
Cl₂ displaces Br-.
No chemical reaction.
Br- displaces Cl₂.
O₂(g) is evolved.
4)
What happens when a piece of Cu is put into a solution of magnesium chloride?
Cu displaces Mg.
Chlorine gas is liberated.
No chemical reaction.
Colour of the solution changes to light green.
5)
Which one of the following metals replaces hydrogen from acid?
Sodium
Gold
Silver
Platinum
6)
Which one of the following four metals would be displaced from its salt solution by the other three metals?
Li
Al
Ca
Pt
7)
Point out the correct statement about the reactivity of iron.
More reactive than potassium
More reactive than gold
Less reactive than copper
More reactive than aluminium
8)
Which among the following reactions represents the displacement of less reactive metal from its salt solution by a more reactive metal?
Silver Nitrate + Sodium Chloride
Sodium Bromide + Chlorine Water
Water + Sugar Solution
Copper Sulphate Solution + Iron nail
9)
Which among the following element changes the color of the knife in this experiment?
Oxygen
Copper
Sulphur
Iron
10)
Copper sulphate solution is added to a test tube containing clean iron nails. Where would the deposition of copper on the nail begin?
At the tip of the nail.
From the head of the nail.
In the middle of the nail.
Anywhere on the nail.