Which of the following statement(s) is /are false ?

Chemistry Enviromental Chemistry ( Not In Syllabus ) Practical Chemistry Single Correct MCQ

Published on: August 12, 2026

Fe 3+ gives red precipitate with dimethyl glyoxime in alkaline solution.

Cu 2+ ion with potassium iodide solution gives a dirty brownish white precipitate which turns white on adding hypo solution.

A filter paper soaked in mercurous nitrate turns black in contact with ammonia gas.

Ag 2 O does not dissolve in nitric acid as well as ammonia solution.

Text Solution

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The correct answer is:

CHECK THE SOLUTION.

(a,d)

Fe 2+ responds to this test but not Fe 3+ ; Fe(II) gives soluble red iron(II) dimethylglyoxime in alkaline solution.

Ag 2 O ↓ + 4NH 3 + H 2 O 2[Ag(NH 3 ) 2 ] + + 2OH –

Ag 2 O ↓ + 2H + 2Ag + + H 2 O

and are correct statements.

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