Qualitative Analysis: Test For Cations! Trivia Quiz

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    Forms a Blue Precipitate when aqueous Ammonia is added, that redissolve in the excess reagent to form a dark blue solution.  

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About This Quiz

Explore the fascinating world of cation testing in this trivia quiz. Identify various cations like Fe 2+, Fe 3+, and Cu 2+ based on their reactions with Sodium Hydroxide and aqueous Ammonia. This quiz enhances your understanding of qualitative analysis, crucial for chemistry students and professionals.

Qualitative Analysis: Test For Cations! Trivia Quiz - Quiz

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  • 2. 

    Forms a Reddish-Brown Precipitate when aqueous Ammonia is added, that does not redissolve in the excess reagent. 

    Explanation
    When aqueous ammonia is added to a solution containing Fe3+, it forms a reddish-brown precipitate. This precipitate does not redissolve even when excess ammonia is added. This indicates the presence of Fe3+ in the solution.

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  • 3. 

    Forms a Reddish Brown Precipitate when Sodium Hydroxide is added, which does not redissolve in the excess reagent. 

    Explanation
    When sodium hydroxide is added to a solution containing Fe 3+, it forms a reddish-brown precipitate. This precipitate does not redissolve when excess sodium hydroxide is added. This is due to the formation of a complex compound called iron(III) hydroxide, which is insoluble in water. The reddish-brown color of the precipitate is characteristic of Fe 3+ ions. Therefore, the presence of a reddish-brown precipitate that does not redissolve confirms the presence of Fe 3+ ions in the solution.

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  • 4. 

    Forms a Blue Precipitate when Sodium Hydroxide is added, which does not redissolve in the excess reagent. 

    Explanation
    Cu2+ forms a blue precipitate when Sodium Hydroxide is added. This indicates the presence of Cu2+ ions in the solution. The blue precipitate does not redissolve in the excess reagent, suggesting that it is insoluble. Therefore, Cu2+ is the correct answer.

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  • 5. 

    Forms a Dirty Green Precipitate when Sodium Hydroxide is added, which does not redissolve in the excess reagent. 

    Explanation
    When Sodium Hydroxide is added to a solution containing Fe2+, it forms a dirty green precipitate. This precipitate does not redissolve when excess Sodium Hydroxide is added. Therefore, the correct answer is Fe2+.

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  • 6. 

    Forms a Dirty Green Precipitate when aqueous Ammonia is added, that does not redissolve in the excess reagent. 

    Explanation
    When aqueous ammonia is added to Fe2+, it forms a dirty green precipitate. This precipitate does not redissolve in the excess reagent. Based on this information, the correct answer is Fe2+.

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  • 7. 

    Forms a White Precipitate when aqueous Ammonia is added, that redissolves in the excess reagent. 

    Explanation
    When aqueous ammonia is added to a solution containing Zn 2+, a white precipitate is formed. This white precipitate is the result of the reaction between Zn 2+ and the hydroxide ions (OH-) from the ammonia. However, the precipitate redissolves when excess ammonia is added because it forms a complex ion with Zn 2+, which is soluble in excess ammonia. Therefore, the presence of a white precipitate that redissolves in excess reagent confirms the presence of Zn 2+ in the solution.

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  • 8. 

    Forms a White Precipitate when Sodium Hydroxide is added, which does not redissolve in the excess reagent. 

    Explanation
    When Sodium Hydroxide is added to a solution containing Mg2+ and Ca2+, a white precipitate is formed. This precipitate does not redissolve in the excess reagent. Therefore, the correct answer is Mg2+, Ca2+, Ca2+, Mg2+.

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  • 9. 

    Forms NO Precipitate when aqueous Ammonia is added

    Explanation
    When aqueous ammonia is added to a solution containing Ca2+ and NH4+, no precipitate forms. This is because Ca2+ and NH4+ ions do not react with ammonia to form an insoluble compound. In other words, the combination of Ca2+ and NH4+ ions with ammonia does not result in the formation of a solid that would precipitate out of the solution. Therefore, the correct answer is Ca2+, NH4+, NH4+, Ca2+.

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  • 10. 

    Forms a White Precipitate when Sodium Hydroxide is added, that redissolves in the excess reagent. 

    Explanation
    When sodium hydroxide is added to a solution containing Pb2+, Zn2+, and Al3+, it forms a white precipitate. However, this precipitate redissolves in the excess reagent. Therefore, the correct answer is Pb2+, Zn2+, Al3+.

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  • 11. 

    Forms a White Precipitate when aqueous Ammonia is added, that does not redissolve in the excess reagent. 

    Explanation
    When aqueous ammonia is added to a solution containing Pb2+, Mg2+, and Al3+, a white precipitate is formed. This precipitate does not redissolve in the excess reagent, indicating that it is insoluble. Therefore, the correct answer is Pb2+, Mg2+, Al3+.

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  • 12. 

    Forms NO Precipitate when Sodium Hydroxide is added. 

Quiz Review Timeline (Updated): Mar 22, 2023 +

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • May 05, 2013
    Quiz Created by
    Oex314159
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