Color Reactions PDF

# Color Reactions ## Questions | Question | Option A | Option B | Option C | Option D | Answer | Explanation | |---|---|---|---|---|---|---| | 1. What is the color of Copper(II) sulfate solution? | Blue | Green | Yellow | Red | A | CuSO₄ (aq): Blue solution (copper(II) ions). | | 2. Wha...

# Color Reactions ## Questions | Question | Option A | Option B | Option C | Option D | Answer | Explanation | |---|---|---|---|---|---|---| | 1. What is the color of Copper(II) sulfate solution? | Blue | Green | Yellow | Red | A | CuSO₄ (aq): Blue solution (copper(II) ions). | | 2. What color does Barium chloride give in a flame test? | Green | Blue | Yellow | Red | A | BaCl₂(s): Green flame (barium ions). | | 3. The reaction of Silver nitrate with Sodium chloride produces which color? | White precipitate | Yellow precipitate | Blue precipitate | Red solution | A | AgNO₃ (aq) + NaCl (aq) → AgCl (s) + NaNO₃ (aq): White precipitate of AgCl. | | 4. What is the color of Iron(III) chloride solution? | Yellow | Blue | Green | Red | A | FeCl₃ (aq): Yellow-brown solution (iron(III) ions). | | 5. When Hydrochloric acid is added to Lead(II) iodide, what color precipitate forms? | Yellow | White | Red | Blue | A | PbI₂(s): Yellow precipitate of lead(II) iodide. | | 6. What color does Potassium chromate produce when it reacts with Barium chloride? | Yellow precipitate | Blue precipitate | Green solution | Red solution | A | K₂CrO₄ (aq) + BaCl₂ (aq) → BaCrO₄ (s) + 2KCl (aq): Yellow precipitate of BaCrO₄. | | 7. Which color does Ferric hydroxide appear in a reaction with NaOH? | Brown | Yellow | White | Green | A | FeCl₃ (aq) + 3NaOH (aq) → Fe(OH)₃ (s) + 3NaCl (aq): Brown precipitate of Fe(OH)₃. | | 8. The addition of Ammonium hydroxide to Copper(II) sulfate gives which color? | Blue | Green | Yellow | Red | A | CuSO₄ (aq) + 2NH₄OH (aq) → Cu(OH)₂ (s) + (NH₄)₂SO₄ (aq): Blue precipitate of Cu(OH)₂. | | 9. What color is observed when Calcium carbonate is treated with dilute HCI? | Fizzing | Green | Yellow | Red | A | CaCO₃ (s) + 2HCl (aq) → CaCl₂ (aq) + CO₂(g) + H₂O (l): Fizzing due to CO₂ gas release. | | 10. Which color does Manganese(II) sulfate react with Potassium permanganate? | Pink | Blue | Green | Yellow | A | MnSO4 (aq) + KMnO4 (aq) → MnO2 (s) + K2SO4 (aq): Pink color (KMnO4) is reduced to colorless Mn²⁺. | | 11. What color does Lead(II) chromate produce in solution? | Yellow | Blue | Green | Red | A | PbCrO₄ (s): Bright yellow solid (lead(II) chromate). | | 12. The reaction of Barium sulfate with dilute HCl results in which color? | No color change | Yellow | Blue | Green | A | BaSO₄ (s) + HCl (aq): No color change; BaSO4 is insoluble. | | 13. What color is observed when Silver chloride is exposed to light? | Dark gray | Yellow | Blue | Green | A | 2AgCl (s) → 2Ag (s) + Cl₂ (g): Dark gray due to silver metal formation. | | 14. What is the color of Zinc oxide when heated? | Yellow | Red | Green | Blue | A | ZnO (s): Yellow when heated, white when cooled. | | 15. When Nickel(II) sulfate is mixed with Ammonium hydroxide what color precipitate forms? | Green | Yellow | Blue | Red | A | NiSO₄ (aq) + 2NH₄OH (aq) → Ni(OH)₂ (s) + (NH₄)₂SO₄ (aq): Green precipitate of Ni(OH)₂. | | 16. The reaction of Potassium dichromate with dilute HCI gives which color? | Orange | Yellow | Blue | Red | A | K₂Cr₂O₇ (s) + 14HCl (aq) → 2CrCl₃ (aq) + 3Cl₂ (g) + 7H₂O (l): Orange solution changes to green. | | 17. What color is observed in the flame test for Lithium salts? | Crimson | Yellow | Blue | Green | A | Li⁺ (aq): Crimson flame. | | 18. The color of Magnesium sulfate solution is? | Colorless | Yellow | Blue | Red | A | MgSO₄ (aq): Colorless solution. | | 19. When Iron(II) ions are oxidized, what color do they turn? | Brown | Yellow | Green | Blue | A | Fe²⁺ (aq) → Fe³⁺ (aq): Green (Fe²⁺) to brown (Fe³⁺). | | 20. What is the color of Lead(II) acetate in solution? | Colorless | Yellow | Blue | Green | A | Pb(C₂H₃O₂)₂ (aq): Colorless solution. | | 21. The addition of H₂ SO₄ to Copper(II) carbonate gives which color? | Blue | Green | Yellow | Brown | A | CuCO₃ (s) + H₂SO₄ (aq) → CuSO₄ (aq) + CO₂ (g) + H₂O (l): Blue solution of CuSO₄.| | 22. What color is observed in the flame test for Sodium salts? | Yellow | Red | Blue | Green | A | Na⁺ (aq): Intense yellow flame. | | 23. The reaction of Calcium hydroxide with Phenolpht halein indicates which color? | Pink | Blue | Yellow | Red | A | Ca(OH)2 (aq) + phenolp hthalein → Pink solution: Indicates basicity. | | 24. What color does Silver bromide precipitate have? | Yellow | White | Blue | Red | A | AgBr (s): Light yellow precipitate. | | 25. When Ammonium sulfate is heated, what color is observed? | Yellow | White | Red | Blue | A | (NH₄)₂SO₄ (s) → products upon heating: No significant color change, can give off a slight white vapor. | | 26. The addition of Iodine to starch results in which color? | Blue-black | Red | Yellow | Green | A | I₂ + starch → Blue-black complex: Indicates the presence of starch. | | 27. What is the color of Iron(II) sulfate in solution? | Green | Yellow | Blue | Red | A | FeSO₄ (aq): Pale green solution (iron(II) ions). | | 28. The addition of Barium hydroxide to sulfuric acid gives which color? | White precipitate | Yellow | Blue | Green | A | Ba(OH)₂ (aq) + H₂SO₄ (aq) → BaSO₄ (s) + 2H₂O (l): White precipitate of BaSO₄. | | 29. When Potassium ferricyanide reacts with Iron(II) ions, what color is produced? | Blue| Red | Green | Yellow | A | K₃[Fe(CN)₆] (aq) + Fe²⁺ (aq) → Prussian Blue (Fe₃[Fe( CN)₆]₂ (s)): Blue precipitate. | | 30. The reaction of Ammonium thiocyanate with Iron( III) ions results in which color? | Blood red | Yellow | Blue | Green | A | Fe³⁺ (aq) + SCN^- (aq) → [Fe(SCN)]²⁺ (aq): Blood red complex. | | 31. What color does Lead(II) nitrate produce when heated? | Yellow| Brown | White | Blue | A | Pb(NO₃)₂ (s) → PbO (s) + 2NO₂ (g) + O₂ (g): Yellow lead(II) oxide. | | 32. The addition of NaOH to Calcium chloride gives which color precipitate? | White | Yellow | Green | Blue | A | CaCl₂ (aq) + 2NaOH (aq) → Ca(OH)₂ (s) + 2NaCl (aq): White precipitate of Ca(OH)₂. | | 33. What color is observed when Calcium phosphate reacts with dilute HCI? | White precipitate | Yellow | Blue | Green | A | Ca₃(PO₄)₂ (s) + 6HCl (aq) → 3CaCl₂ (aq) + 2H₃PO₄ (aq): White insoluble calcium phosphate. | | 34. The addition of Sulfuric acid to Copper(II) hydroxide produces which color? | Blue | Yellow | Brown | Green | A | Cu(OH)₂ (s) + H₂SO₄ (aq) → CuSO₄ (aq) + 2H₂O (l): Blue solution of CuSO4. | | 35. What is the color of Potassium bromide solution? | Colorless | Yellow | Blue | Green | A | KBr (aq): Colorless solution. | | 36. The reaction of Ammonium chloride with Sodium hydroxide results in which color? | No color change | Yellow | Blue | Green | A | NH₄Cl (s) + NaOH (aq) → NaCl (aq) + NH₃ (g) + H₂O (l): No color change. | | 37. What color does Strontium salts produce in a flame test? | Red | Yellow | Blue | Green | A | Sr²⁺ (aq): Bright red flame. | | 38. The reaction of Mercury(I) chloride with Potassium iodide forms which color? | Yellow precipitate | White precipitate | Blue | Green | A | Hg₂Cl₂ (s) + 2KI (aq) → 2HgI (s) + 2KCl (aq): Bright yellow precipitate of mercury(I) iodide. | | 39. What is the color of Sodium thiosulfate solution? | Colorless | Yellow | Blue | Green | A | Na₂S₂O₃ (aq): Colorless solution. | | 40. The reaction of Barium nitrate with Sulfuric acid results in which color? | White precipitate | Yellow | Blue | Green | A | Ba(NO₃)₂ (aq) + H₂SO₄ (aq) → BaSO₄ (s) + 2HNO₃ (aq): White precipitate of BaSO₄. |