####24. The correct option(s) to distinguish nitrate salts to and taken separately is (are)
(2018 Adv.) (a) shows the characteristic green colour in the flame test
(b) Only shows the formation of precipitate by passing in acidic medium
(c) Only shows the formation of precipitate by passing in faintly basic medium
(d) has higher reduction potential than (measured under similar conditions)
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Solution:
- Statement wise explanation is
Statement (a) produces yellow-green colour in flame test while produces bluish-green colour in flame test. Thus, due to the presence of green colour in both the cases, flame test is not the suitable method to distinguish between nitrate salts of and . Hence this statement is wrong.
Statement (b) belong to group II of cationic or basic radicals. It gives black ppt. of if is passed through it in the presence of acid (e.g HCl). does not show this
property hence this can be considered as a suitable method to distinguish between and .
Hence, this statement is correct.
Statement (c) In faintly basic medium when is passed both and forms precipitates. Thus, it is not suitable method to distinguish between them.
Hence, this statement is incorrect
Statement (d) The standard reduction potential of is while that of is . This can be used to distinguish between and . In general less electropositive metals have higher SRP.
Hence, this statement is correct.
