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Colourless salt (A) + dil. `H_(2)SO_(4) " or" CH_(3)CO OH+KI to `blue colour with starch. (A) can be

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Colourless salt (A) + dil. `H_(2)SO_(4) " or" CH_(3)CO OH+KI to `blue colour with starch. (A) can be
A. `K_(2)SO_(3)`
B. `Na_(2)CO_(3)`
C. `NH_(4)NO_(2)`
D. `NH_(4)Cl`
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Correct Answer - C
`2NO_(2)^(-) +3I^(-) +4CH_(3)CO OH to I_(3)^(-) +2NO uarr + 4CH_(3)CO O^(-) + 2H_(2)O`.
`I_(3)^(-) + " starch" to `blue colouration.
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