CBSE Class 10 Science 2019 · Paper 31/4/1 · Question 22(b)
- (a)Arrange the following metals in the increasing order of their reactivities : Copper, Zinc, Aluminium and Iron
- (b)List two observations you would record in your notebook 30 minutes after adding iron filings to copper sulphate solution.
Answer
Reactivity increases as ; iron filings get a reddish-brown copper coat and the blue solution turns light green.
(a) Copper, iron, zinc, aluminium (from the least to the most reactive), that is, .
(b) (i) A reddish-brown coating of copper is deposited on the iron filings. (ii) The blue colour of the copper sulphate solution fades and it turns light green.
(Iron is more reactive than copper and displaces it: .)
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