Which of the following statement is correct?

  • Zinc is more reactive than sodium

  • Copper is more reactive than zinc

  • Zinc is more reactive than iron

  • Iron is more reactive than zinc


C.

Zinc is more reactive than iron

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 The best electrical conductor is

  • gold

  • copper

  • silver

  • aluminium


C.

silver

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The most reactive metal is

  • Iron

  • Gold

  • Zinc

  • Potassium


D.

Potassium

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(a) Observe the following figure,(a) and (b) and complete the reaction and tell in which beaker/beakers displacement reactions take place.





(ii) Arrange Zinc, Aluminium, Iron and Copper in the decreasing order of reactivity.


(a)
Beaker A : Copper Sulphate (CuSO4) + Zinc granite (Zn)

Beaker B : Copper Sulphate (CuSO4) + Iron nail (Fe)

Beaker C : Zinc Sulphate (ZnSO4) + Copper turnings (Cu)

Beaker D : Iron Sulphate (FeSO4) + Copper turnings (Cu)

Beaker E : Zinc Sulphate ZnSO4) + Iron nail (Fe)

(b)
Beaker A : Copper Sulphate + Zinc → Zinc Sulphate + Copper

Beaker B : Copper Sulphate + Iron → Ferrous Sulphate + Copper

Beaker C : Zinc Sulphate + Copper → No reaction

Beaker D : Iron Sulphate (FeSO4) + Copper turnings → No reaction

Beaker E : Zinc Sulphate (ZnSO4) + Iron (Fe) → No reaction

In beakers A and B displacement reaction takes place.

(ii)

Aluminium > Zinc > Iron > Copper

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Metals react with acids to give

  • Oxygen gas

  • Hydrogen gas

  • Sulphur dioxide gas

  • Carbon dioxide gas


B.

Hydrogen gas

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