Formation of a green-edged flame on igniting the vapors evolved by heating a given inorganic salt with a few ml of ethyl alcohol and conc. $H_{2} S O_{4}$ indicates the presence of a:

tartrate

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oxalate

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acetate

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borate

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Solution

The correct option is C borate
It indicates the presence of tartrate.
$2 N a_{3} B O_{3} + 3 H_{2} S O_{4} ⟶ 3 N a_{2} S O_{4} + 2 H_{3} B O_{3}$
$\begin{matrix} H_{3} B O_{3} & + & 3 C_{2} H_{5} O H & ⟶ & {(C_{2} H_{5})}_{3} B O_{3} & + & 3 H_{2} O . B u r n s w i t h g r e e n e d g e f l a m e \end{matrix}$

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