JEE CHEMISTRY UNIT 20
QUIZ NO 2
TOTAL QUESTIONS = 20
1. Which compound is used as a primary standard in acid-base titrations
A. Sodium carbonate
B. Potassium hydrogen phthalate
C. Sodium hydroxide
D. Ammonium chloride
2. What is the color of Fe3+ ions in aqueous solution
A. Red
B. Blue
C. Green
D. Yellow
3. Which flame color is observed for potassium in a flame test
A. Purple
B. Red
C. Green
D. Blue
4. Which reagent is used to confirm the presence of phenol
A. Sodium hydroxide
B. Sulfuric acid
C. Ammonium molybdate
D. Neutral ferric chloride
5. Which gas is evolved when zinc reacts with dilute hydrochloric acid
A. Nitrogen gas
B. Oxygen gas
C. Chlorine gas
D. Hydrogen gas
6. What is the purpose of washing a precipitate with water during filtration
A. To enhance color
B. To reduce size
C. To remove soluble impurities
D. To increase yield
7. Which compound is used in the iodometric titration
A. Barium sulfate
B. Sodium thiosulfate
C. Potassium permanganate
D. Sodium carbonate
8. Which acid is used in the preparation of hydrogen gas in the laboratory
A. Sulfuric acid
B. Nitric acid
C. Hydrochloric acid
D. Acetic acid
9. Which method is used to separate immiscible liquids
A. Distillation
B. Chromatography
C. Filtration
D. Separating funnel
10. What is the function of potassium permanganate in redox titrations
A. Catalyst
B. Reducing agent
C. Indicator
D. Oxidizing agent
11. What is the color of the precipitate formed when barium chloride reacts with dilute sulfuric acid
A. Yellow
B. Green
C. White
D. Red
12. What is the role of silica gel in chromatography
A. Mobile phase
B. Product
C. Reactant
D. Stationary phase
13. What is the color of the precipitate formed when AgNO3 reacts with NaCl
A. Yellow
B. Brown
C. Green
D. White
14. Which technique is used to separate pigments from plant extracts
A. Sublimation
B. Distillation
C. Chromatography
D. Filtration
15. What is the role of activated charcoal in purification processes
A. Reduction
B. Adsorption
C. Catalysis
D. Oxidation
16. Which compound is used to test for the presence of carbonate ions
A. Barium chloride
B. Sodium hydroxide
C. Silver nitrate
D. Dilute HCl
17. Which reagent is used to detect the presence of carbonyl compounds
A. Hydrogen peroxide
B. Iodine
C. 2,4-Dinitrophenylhydrazine
D. Conc. sulfuric acid
18. Which reagent is used to test the presence of unsaturation in hydrocarbons
A. Bromine water
B. Silver nitrate
C. Potassium permanganate
D. Sodium hydroxide
19. Which compound is used to detect the presence of phenols
A. Neutral ferric chloride
B. Silver nitrate
C. Concentrated HCl
D. Potassium iodide
20. What is the role of sodium hydroxide in the preparation of soap
A. Reducing agent
B. Base catalyst
C. Oxidizing agent
D. Indicator
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