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ICSE Class 9 Chemistry Question 8 of 18

Chemical Changes & Reactions — Question 16

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Question 16

Define the term – double decomposition – neutralization reaction with a suitable representation.

Convert :

(a) an insoluble base (b) a soluble base

to their respective soluble salts by neutralization reaction.

Answer

Reaction between a base and an acid to give two new compounds — salt & water — by interchange of radicals is termed double decomposition neutralization reaction.

It is represented as :

Define the term double decomposition – neutralization reaction with a suitable representation. Chemical Changes and Reactions, Simplified Chemistry Dalal Solutions ICSE Class 9

For example,

NaOH [Base] + HCl [Acid] ⟶ NaCl [Salt] + H2O [Water]

(a) Insoluble base [oxide] — Copper [II] oxide reacts with sulphuric acid and forms Copper sulphate :

CuO + H2SO4 ⟶ CuSO4 + H2O

(b) A soluble base — Sodium hydroxide reacts with HCl and forms soluble salt (sodium chloride) and water:

NaOH + HCl ⟶ NaCl + H2O