The nitrate (A) can be confirmed by flame test .
The colour imparted by the salt to the flame is :

yellow

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green

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blue

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red

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Solution

The correct option is B green
The sequence of reactions is given below.
$B a (N O_{3})_{2} h e a t - - \to B a O d i l H C l - ----- \to B a C l_{2} A B B a O A m m o n i u m c a r b o n a t e - ------------ \to B a C O_{3} d i l H C l - --- \to B a C l_{2} P o t a s s i u m c h r o m a t e - ----------- \to B a C r O_{4} d i l H_{2} S O_{4} - ------- \to B a S O_{4} C D E$
The white precipitate is of barium carbonate. The yellow precipitate (D) is of barium chromate. Barium sulfate precipitate is also white in color. The metal nitrate is barium nitrate. Barium gives green colour in flame test.

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