MCQ
In laboratory nitric acid is prepared by heating :
- Apotassium nitrate and dil H2SO4
- ✓potassium nitrate and conc. H2SO4
- Cpotassium nitrate and conc. HCl
- Dpotassium nitrate and dil. HCI
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| Ion | Colour | |
| (a) | $Ni ^{+2}$ | Yellow |
| (b) | $Fe ^{+3}$ | Yellowish - brown |
| (c) | $CrO _4{ }^{2-}$ | Yellow |
| (d) | $Fe ^{+2}$ | Green |