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(a) Write the chemical equation in the b...

(a) Write the chemical equation in the balanced form.
`Fe(s) + H_(2)O(g) to Fe_(3)O_(4)(s) + H_(2)(g)`
(b) Identify the type of reaction from the equation given below :
`Na_(2)SO_(4)(aq) + BaCl_(2) (aq) to BaSO_(4)(s) + NaCI(aq)`
(c) You could have noted that when copper powder is heated in a china dish, the surface of copper powder gets coated with black coloured substance.
(i) Why is this black coloured substance formed ? (ii) What is this black substance ?
(iii) Write the chemical equation of the reaction taking place.

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