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- Question
Permanent hardness of water may be removed by the addition of
Options- A. sodium carbonate
- B. alum
- C. potassium permanganate
- D. lime
- Correct Answer
- sodium carbonate
- 1. Heavy water is
Options- A. deuterium oxide
- B. PH7
- C. rain water
- D. tritium oxide Discuss
- 2. Bromine is a
Options- A. black solid
- B. red liquid
- C. colourless gas
- D. highly inflammable gas Discuss
- 3. Chlorophyll is a naturally occurring chelate compound in which central metal is
Options- A. copper
- B. magnesium
- C. iron
- D. calcium Discuss
- 4. Which of the following is used in pencils?
Options- A. Graphite
- B. Silicon
- C. Charcoal
- D. Phosphorous Discuss
- 5. Which of the following is not an isotope of hydrogen?
Options- A. Tritium
- B. Deuterium
- C. Protium
- D. Yttrium Discuss
- 6. Carbon, diamond and graphite are together called
Options- A. allotropes
- B. isomers
- C. isomorphs
- D. isotopes Discuss
- 7. Brass gets discoloured in air because of the presence of which of the following gases in air?
Options- A. Oxygen
- B. Hydrogen sulphide
- C. Carbon dioxide
- D. Nitrogen Discuss
- 8. Balloons are filled with
Options- A. nitrogen
- B. helium
- C. oxygen
- D. argon Discuss
- 9. Water is a good solvent of ionic salts because
Options- A. it has a high specific heat
- B. it has no colour
- C. it has a high dipole moment
- D. it has a high boiling point Discuss
- 10. The group of metals Fe, Co, Ni may best called as
Options- A. transition metals
- B. main group metals
- C. alkali metals
- D. rare metals Discuss
General Science problems
Search Results
Correct Answer: deuterium oxide
Correct Answer: red liquid
Correct Answer: magnesium
Correct Answer: Graphite
Correct Answer: Yttrium
Explanation:
http://en.wikipedia.org/wiki/Isotopes_of_hydrogen
Correct Answer: allotropes
Correct Answer: Hydrogen sulphide
Correct Answer: helium
Correct Answer: it has a high dipole moment
Correct Answer: transition metals
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