Discussion
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- Question
Activated Charcoal is used to remove colouring matter from pure substances by_______
Options- A. Bleaching
- B. Oxidation
- C. Adsorption
- D. Reduction
- Correct Answer
- Adsorption
- 1. What is the common name of CaOCl2?
Options- A. Baking Powder
- B. Baking Soda
- C. Bleaching Powder
- D. Washing Soda Discuss
- 2. Nitric acid does not react with
Options- A. Gold
- B. Copper
- C. Zinc
- D. Iron Discuss
- 3. All isotopes of the same element have ____________
Options- A. different atomic numbers and different atomic mass
- B. different atomic numbers and the same atomic mass
- C. the same atomic number but different atomic masses
- D. the same atomic number and the atomic mass Discuss
- 4. Phosphorus is kept in water because
Options- A. its ignition temperature is very high
- B. its ignition temperature is very low
- C. its critical temperature is high
- D. its critical temperature is low Discuss
- 5. Removal of oil and grease from sewage [waste water]
Options- A. Skimming
- B. Filtration
- C. Screening
- D. None of the above Discuss
- 6. Nitrogen fixation is a process of
Options- A. Assimilation of nitrate
- B. Utilisation of nitrogen gas
- C. Conversion of organic nitrogen to proteins
- D. Conversion of molecular nitrogen to ammonia Discuss
- 7. The biogas used for cooking is a mixture of which of the following ?
Options- A. Carbon dioxide & oxygen
- B. Isobutane & propane
- C. Methane & carbon monoxide
- D. Methane & carbon dioxide Discuss
- 8. On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because ________
Options- A. Mercury is a metal
- B. Density of mercury is greater than that of water
- C. Cohesion of mercury is greater than its adhesion with glass
- D. Cohesion of water is greater than its adhesion with glass Discuss
- 9. The property of metals by which they can be beaten into thin sheets is called _______________.
Options- A. ductility
- B. malleability
- C. viscosity
- D. tensile strength Discuss
- 10. The passage of an electric current through a conducting liquid causes ___________.
Options- A. Galvanisation
- B. Evaporation
- C. Physical Reaction
- D. Chemical Reaction Discuss
Chemistry problems
Search Results
Correct Answer: Bleaching Powder
Correct Answer: Gold
Correct Answer: the same atomic number but different atomic masses
Correct Answer: its ignition temperature is very high
Correct Answer: Skimming
Explanation:
Skimming is the removal of any material or particles that are floating on the surface. Hence, Removal of oil and grease from sewage - waste water is called as skimming.
Correct Answer: Conversion of organic nitrogen to proteins
Correct Answer: Methane & carbon dioxide
Correct Answer: Cohesion of mercury is greater than its adhesion with glass
Correct Answer: malleability
Correct Answer: Chemical Reaction
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