Chemistry problems
- 1. In nuclear reactor,Chain reaction is controlled by introducing
Options- A. cadmium rod
- B. iron rod
- C. platinum rod
- D. graphite rod Discuss
Correct Answer: cadmium rod
- 2. Which of the following processes is used to remove reducible oxides from the metal?
Options- A. liquation
- B. cupellation
- C. poling
- D. electro refining Discuss
Correct Answer: poling
- 3. Which of the following is a radioactive element
Options- A. Sulphur
- B. Polonium
- C. Tellurium
- D. Selenium Discuss
Correct Answer: Polonium
- 4. The credit for the discovery of transuranic element goes to
Options- A. Hahn
- B. Rutherford
- C. Seaborg
- D. Curie Discuss
Correct Answer: Seaborg
- 5. An element which is preserved under water is
Options- A. sodium
- B. sulphur
- C. red phosphorus
- D. white phosphorus Discuss
Correct Answer: white phosphorus
Explanation:
White phosphorus undergoes spontaneous combustion when exposed to air. In order to prevent this spontaneous ignition, it is preserved under water.
- 6. Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to
Options- A. dehydration
- B. oxidation
- C. reduction
- D. dehydrogenation Discuss
Correct Answer: oxidation
Explanation:
Saw dust contains carbon which is oxidised to carbon dioxide by concentrated nitric acid;
- 7. Which one among the following is the heaviest
Options- A. 1 mole of water molecules
- B. 1 mole of ammonia molecules
- C. 1 mole of sodium atoms
- D. 1 mole of hydrogen molecules Discuss
Correct Answer: 1 mole of sodium atoms
- 8. Which one of the following is a natural colloid ?
Options- A. Cane sugar solution
- B. Blood
- C. Sodium chloride solution
- D. Urea solution Also asked in: AIEEE, Bank Exams, CAT, Bank Clerk, Bank PO
Correct Answer: Blood
- 9. Silver Mirror test is given by which one of the following compounds? 1. Benzophenone 2. Acetaldehyde 3. Acetone 4. Formaldehyde
Options- A. Only 1
- B. Only 2
- C. 1 and 3
- D. 2 and 4 Also asked in: AIEEE
Correct Answer: 2 and 4
Explanation:
Both Formaldehyde and Acetaldehyde will give this test
- 10. What is the oxidation number of sulfur in H2S?
Options- A. 2
- B. -2
- C. 1
- D. -1 Also asked in: GATE, CAT, Bank Exams, AIEEE, Database Administrator, Bank PO, Bank Clerk, Analyst
Correct Answer: -2
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