Question

certain chemical reaction are given below find the energy changes in them and write down type of chemical reaction take place there?(a)plating a copper ring with gold.(b)reaction between sodium hydroxide and sulphuric acid .(c)glowing of a firefly.​

Answer 1

Explanation:

This reaction is an example of double displacement and precipitation reaction In which a precipitate of silver chloride is obtained.

(II). FeSO

4

(S)→Fe

2

O

3

(s)+SO

2

(g)+SO

3

(g)

This reaction is an example of decomposition (thermal decomposition) reaction because a single substance (FeSO

4

) breaks down into three substances (Fe2O

3

SO

2

and SO

3

). Here, SO

2

gives the smell of burning sulphur.

Answer 2

endothermic

exothermic

exothermic

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