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| 1. |
In sodium fusion tests why excess of sodium is taken? |
| Answer» Solution :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`. | |