Question

what is meant by :-
(a.) Displacement reaction.
(b) Reduction reaction.
(C) Combination reaction.​

Answer 1

Answer:

c)Displacement reactions -The chemical reactions in which a more reactive element displaces a less reactive element from a compound are known as displacement reactions. For example,

i) Zn (s) + CuSO4 (aq)  –>  ZnSO4 (aq) + Cu (s).

ii) Cu (s) + 2AgNO3 (aq) –> Cu (NO3)2 (aq) +2Ag (s).

2.

Explanation:

Reduction: Reaction that shows the loss of oxygen or gain of hydrogen.

Both oxidation and reduction take place simultaneously and hence called redox reaction.

ZnO + C –> Zn + CO

ZnO reduce to Zn —- reduction

C oxidize to CO ——oxidation

a)Combination reaction – The reactions in which two or more substances combine to form a new substance are called combination reaction. For example,

2Mg(s) + O2 (g) –> 2 MgO (s)

Answer 2

Answer:

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Explanation:

(i) When two or more reactants combine in a reaction to form a single product, it is called a combination reaction.

(ii) e.g.: When a Magnesium strip is burnt in air, it combines with oxygen, to form white ash of magnesium oxide.

(iii) 2Mg(s) + O2(g)→ 2MgO(s) (white ash) Magnesium Magnesium oxide