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Explain the following: In sodium fusio...

Explain the following:
In sodium fusion test, why excess of sodium is taken?

Text Solution

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If sulphur and nitrogen both are present sodium thiocyanate (NaCNS) may be produced this may give a red coloration with `Fe^(3+)` but will not respond to tests for cyanide or sulphide ions. With excess of sodium the thiocyanate if formed will be decomposed like this `NaCNS+2Na to NaCN+Na_(2)S`.
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