We have three test tubes having aqueous solutions of Ca(NO3)2, Ba(NO3)2 and K2CO3 respectively. On addition of dil H2SO4. Which test tube solution turns milky?
Correct answer: A. Ca(NO3)2 solution
- A. Ca(NO3)2 solution
- B. Ba(NO3)2 solution
- C. K2CO3 solution
- D. All turned milky
Explanation
When sulfuric acid is added to calcium nitrate, calcium sulfate is produced, which is slightly soluble and often forms a fine precipitate that appears milky. This contrasts with barium nitrate, which forms a dense white precipitate of barium sulfate, and potassium carbonate, which releases carbon dioxide gas causing bubbling but no precipitate. Thus, only the calcium nitrate solution turns milky due to the formation of a fine calcium sulfate precipitate.
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The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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