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NaCl and NaCN can be distinguished by us...

`NaCl` and `NaCN` can be distinguished by using the following reagents in the given sequence ?

A

`(i) H_(2)O_(2)//Delta (ii) AgNO_(3)//HNO_(3)`

B

`HgNO_(3)(aq)`

C

(i) Conc. `H_(2)SO_(4)` (ii) combustion of gas evolved

D

By all of A, B & C

Text Solution

Verified by Experts

The correct Answer is:
D
`CH^(-) + H_(2)O_(2) rarr HCO_(3)^(3) + NH_(3)`,
`Cl^(-) + AgNO_(3)//HNO_(3) rarr AgCl darr`
`CN^(-) + Hg_(2)^(2) rarr underset("Grey")Hg darr + Hg underset(("Soluble"))(CH)_(2)`,
`Cl^(-) + hg_(2)^(2+) rarr underset(("White"))Hg_(2)Cl_(2) darr`,
`NaCH + "conc." H_(2)SO_(4) rarr CO uarr +(NH_(4))_(2) SO_(4) + Na_(2)SO_(4)`,
`Cl^(-) + "conc."H_(2)SO_(4) rarr HCl + HSO_(4)^(-)`
`CO(g)` burns with blue flame.
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