What each test reveals about an unknown halide ion? Suggest another test which would confirm that identity.
1. Addition of Cl2 and CH2Cl2 to an aqueous solution of an unknown halide ion led to a dark CH2Cl2 layer.
2. Addition of 0.1M AgNO3 to another sample of the same halide ion solution generated a light yellow precipitate.
3. Addition of concentrated NH3 to the same halide solution left a cloudy solution
4. Addition of acidic 0.1M NaNO2, 0.5M HNO3 and CH2Cl2 to a unknown halide ion solution resulted in a colorless CH2Cl2 layer