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Which of the following statements "is"//...

Which of the following statements `"is"//"are"` correct?

A

In Lassaigne's test for halogens, conc. `HNO_(3)` is used to remove HCN and `H_(2)S`

B

When an organic compound is heated with dry CuO and the gases evolved are passed through lime water which turns milky, the gas may be `CO_(2)` or `SO_(2)`

C

In Carius method, sulphur is oxidised to `SO_(4)^(2-)` ion with fuming `HNO_(3)`

D

In Lassaigne's test, N present in the organic compound is converted into CN-'' ions

Text Solution

Verified by Experts

The correct Answer is:
A, B, C, D
a) = Conc. -`HNO_(3)` removing `CN^(-), S^(-2)`, other wise these ions also giving test with `AgNO_(3)` solution
b) White precipitation due to formation of `CaCO_(3)` or `CaSO_(3)`
c) Due to oxidizing power of Conc. `HNO_(3)`
d) Due to oxidizing power of Conc. `HNO_(3)`
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