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JEE Advanced 2018Paper 2
Exam
JEE Advanced
Year
2018
Paper
Paper 2
Subject
Chemistry
Chapter
Practical Chemistry

JEE Advanced 2018 · Paper 2 · Chemistry · Practical Chemistry

The correct option(s) to distinguish nitrate salts of M n ^ 2 +...

The correct option(s) to distinguish nitrate salts of Mn2+andCu2+M{n}^{2 +}andC{u}^{2 +} taken separately is(are)

Options

  1. AMn2+M{n}^{2 +} shows the characteristic green colour in the flame test
  2. BOnly Cu2+C{u}^{2 +} shows the formation of precipitate by passing H2S{H}_{2}S in acidic medium
  3. COnly Mn2+M{n}^{2 +} shows the formation of precipitate by passing H2S{H}_{2}S in faintly basic medium
  4. DCu2+/CuC{u}^{2 +} / Cu has higher reduction potential than Mn2+/MnM{n}^{2 +} / Mn (measured under similar conditions)

Correct answer

B. Only Cu2+C{u}^{2 +} shows the formation of precipitate by passing H2S{H}_{2}S in acidic medium

Step-by-step solution

(A)( A ) Cu+2andMn+2C{u}^{+ 2}andM{n}^{+ 2} both gives green colour in flame test and cannot distinguished
(B)( B ) Cu+2C{u}^{+ 2} belongs to group-II of cationic radical will gives ppt. of CuS in acidic medium
(C)( C ) Cu+2andMn+2C{u}^{+ 2}andM{n}^{+ 2} both form ppt. in basic medium
(D)( D ) Cu+2/Cu=+0.34v(SRP)C{u}^{+ 2} / Cu = + 0.34v\left(SRP\right)
Mn+2/Mn=−0.1.18v(SRP)M{n}^{+ 2} / Mn = - 0.1 . 18v\left(SRP\right)
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