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- Question
Which of the following is a radioactive element
Options- A. Sulphur
- B. Polonium
- C. Tellurium
- D. Selenium
- Correct Answer
- Polonium
- 1. 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
- 2. In nuclear reactor,Chain reaction is controlled by introducing
Options- A. cadmium rod
- B. iron rod
- C. platinum rod
- D. graphite rod Discuss
- 3. The hard Shell of an egg was dissolved in HCL. The egg was then placed in a concentration solution of NaCl. What will happens ______
Options- A. The egg will shrink
- B. The egg will swell
- C. The egg will become harder
- D. There will be hardly any visible change Discuss
- 4. Temporary hardness is due to the presence of
Options- A. Calcium carbonate
- B. calcium bicarbonate
- C. magnesium sulphate
- D. calcium sulphate Discuss
- 5. Ethanol is converted into ethoxy ethane,
Options- A. by heating excess of ethanol with conc. H2SO4 at 140°C
- B. by treating with conc. H2SO4 at room temperature
- C. by treating with conc. H2SO4 at 273 K
- D. by heating Ethanol with excess of conc. H2SO4 at 443 K Discuss
- 6. The credit for the discovery of transuranic element goes to
Options- A. Hahn
- B. Rutherford
- C. Seaborg
- D. Curie Discuss
- 7. An element which is preserved under water is
Options- A. sodium
- B. sulphur
- C. red phosphorus
- D. white phosphorus Discuss
- 8. 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
- 9. 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
- 10. Which one of the following is a natural colloid ?
Options- A. Cane sugar solution
- B. Blood
- C. Sodium chloride solution
- D. Urea solution Discuss
Chemistry problems
Search Results
Correct Answer: poling
Correct Answer: cadmium rod
Correct Answer: The egg will shrink
Correct Answer: calcium bicarbonate
Explanation:
Temporary hardness is due to the presence of soluble bicarbonates of calcium and magnesium in water. Permanent hardness is due to the presence of sulphates and chlorides of calcium and magnesium.
Correct Answer: by heating excess of ethanol with conc. H2SO4 at 140°C
Correct Answer: Seaborg
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.
Correct Answer: oxidation
Explanation:
Saw dust contains carbon which is oxidised to carbon dioxide by concentrated nitric acid;
Correct Answer: 1 mole of sodium atoms
Correct Answer: Blood
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