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An element A burns with golden flame in ...

An element A burns with golden flame in air. It reacts with another element B, atomic number 17 to give a product C. An aqueous solution of product C on electrolysis gives a compound D and liberates hydrogen. Identify A, B, C and D. Also write down the equations for the reactions involved. 

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Since the element 'A' catches fire in water and burns with golden yellow flame, it is sodium (Na). The element 'B' with atomic number 17 is chlorine (Cl). Both these combine to form sodium chloride (NaCl) which is designated as 'C'. Upon electrolysis, sodium chloride gives soldium hydroxide (D) and evolves hydrogen along with chlorine.
`2NaCl(aq) + 2H_(2)O(l) overset("Electrolysis")rarr 2NaOH(aq)+ H_(2)(g) + Cl_(2)(g)`
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