Q2 of 28 Page 14

Fe203 + 2Al → Al203 + 2Fe

The above reaction is an example of a:

When an element displaces another element from its compound, a displacement reaction occurs.

In this reaction, aluminium displaces the iron from its compound. Thus, this is an example of displacement reaction.

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3

Identify the substances that are oxidised and the substances that are reduced in the following reactions:

(i) 4Na (s) + O2 (g) → 2Na20 (s)


(ii) CuO (s) + H2 (g) → Cu (s) + H2O (l)

 1

Which of the statements about the reaction below are incorrect?

2Pb0 (s) + C (s) → 2Pb (s) + CO2(g)

(a) Lead is getting reduced

(b) Carbon dioxide is getting oxidised

(c) Carbon is getting oxidised

(d) Lead oxide is getting reduced

 3

What happens when dilute hydrochloric acid is added to iron filings? Tick the correct answer.

 4

What is a balanced chemical equation? Why should chemical equations be balanced?