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(a) What is a chemical equation ?Example...

(a) What is a chemical equation ?Example with the help of an example.
(b) Giving examples, state the difference between balanced and unbalanced chemical equations.
(c ) Balance the following chemical equations :
(i) `NH_(3)to N_(2) + H_(2)`
(ii) `C+CO_(2) to CO`

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The correct Answer is:
`(c) (i)2NH_(3)toN_(2)+3H_(2)" "(ii)C+CO_(2)to2CO`
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