MCQ
The active ion in Tollen's reagent is
- A$C{u^ + }$
- B$Cu(N{H_3})_2^ + $
- C$A{g^ + }$
- ✓$Ag(N{H_3})_2^ + $
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Reason : In a prism kept in air, a ray is incident on first surface and emerges out of second surface. Now if another ray is incident on second surface (of prism) along the previous emergent ray, then this ray emerges out of first surface along the previous incident ray. This particle is called principle of reversibility of light.