Question

35. a) Identify the types of reaction in the following
i) ZnCO3 + 2HCI —
ZnCl2 + H2CO3
ii) 2Cuo
2Cu + O2
Explain Corrosion and Rancidity with examples.​

Answer 1

Answer:

(i)double displacement reaction

(ii)decomposition reaction

Explanation:

Corrosion-It is the process of slow and gradual conversion of a metal into its compound by the attack of air and moisture present in the atmosphere.

Ex-rusting of iron

Rancidity- When food items are kept for a long period,the fats and oils present in them get oxidised and their smell and taste change.

Ex- Rancidity of onion

Answer 2

Ques 35

A) ZnCo3+2HCl(aq) ---->ZnCl2(aq)+ H2CO3(aq)

Ans Displacement reaction

B) 2Cuo(s)-----> 2Cu(s) +O2(g)

Ans Decomposition reaction or it can also be Oxidation reaction

Explain the following terms with one example each.

(a) Corrosion

(a) the phenomena due to which metals are slowly eaten by the reaction of air ,water,and chemical present in the atmosphere

Rusting, the formation of iron oxides is a well-known example

Rusting of iron - When iron articles are kept in moist place then a layer of iron oxide is formed on it . this process is known as rusting of iron

4Fe+3O2+H2O--->2Fe2O3.H2O (hyderated iron oxide )

(b) Rancidity

It is the process of slow oxidation of oils and fats present in the food materials resulting in the production of foul smell and taste in them

Example- flavour or smell in old cooking food

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