DifferenceModerate1 mark
8(ii)
Differentiate between the following pairs of compounds using the reagent given in the bracket:
Zinc Nitrate solution and Calcium Nitrate solution (using excess sodium hydroxide solution)
Topic: Qualitative analysis using NaOH and NH₄OH
Previous-year question practice database
Answer
Exam answer
Add NaOH and then excess NaOH. Zn(NO₃)₂ gives a white precipitate soluble in excess; Ca(NO₃)₂ gives a white precipitate insoluble in excess.
Comparison
| Zinc nitrate | Calcium nitrate |
|---|---|
| White Zn(OH)₂ precipitate dissolves in excess NaOH. | White Ca(OH)₂ precipitate remains insoluble in excess NaOH. |
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