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

Options

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

Answer

D

Explanation

`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.