Analytical chemistry — Practice Quiz
ICSE · Class 10 · Chemistry
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What is the color of Cu²⁺ ions in aqueous solution?
When NH₄OH is added to CuSO₄ solution, what color precipitate is initially formed?
What happens when excess NH₄OH is added to the pale blue precipitate of Cu(OH)₂?
What color is Fe(OH)₃ precipitate?
Sample Questions
Which of the following ions are colorless?
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Na⁺, Zn²⁺, Ca²⁺, Al³⁺
Ions of normal elements (groups IA-VIIA) are generally colorless. Na⁺, Zn²⁺, Ca²⁺, and Al³⁺ are colorless ions. Cu²⁺ is blue and Fe³⁺ is pale yellow, both being transition metal ions.
Which metal hydroxide precipitates are soluble in excess NH₄OH?
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Cu(OH)₂, Zn(OH)₂
Cu(OH)₂ and Zn(OH)₂ dissolve in excess NH₄OH to form soluble complexes. Fe(OH)₃, Pb(OH)₂, and Ca(OH)₂ remain insoluble in excess NH₄OH.
When NaOH is added to Pb(NO₃)₂ solution, what happens in excess NaOH?
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White precipitate dissolves to form colorless solution
Initially, white Pb(OH)₂ precipitate forms. In excess NaOH, it dissolves to form sodium plumbite (Na₂PbO₂), a colorless soluble complex.
Which of the following are amphoteric oxides?
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ZnO, Al₂O₃, PbO
ZnO, Al₂O₃, and PbO are amphoteric oxides that react with both acids and bases. CaO and Na₂O are basic oxides that only react with acids.
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