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- Question
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
- Correct Answer
- Hydrogen sulphide
- 1. Carbon, diamond and graphite are together called
Options- A. allotropes
- B. isomers
- C. isomorphs
- D. isotopes Discuss
- 2. Permanent hardness of water may be removed by the addition of
Options- A. sodium carbonate
- B. alum
- C. potassium permanganate
- D. lime Discuss
- 3. Heavy water is
Options- A. deuterium oxide
- B. PH7
- C. rain water
- D. tritium oxide Discuss
- 4. Bromine is a
Options- A. black solid
- B. red liquid
- C. colourless gas
- D. highly inflammable gas Discuss
- 5. Chlorophyll is a naturally occurring chelate compound in which central metal is
Options- A. copper
- B. magnesium
- C. iron
- D. calcium Discuss
- 6. Balloons are filled with
Options- A. nitrogen
- B. helium
- C. oxygen
- D. argon Discuss
- 7. 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
- 8. 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
- 9. Among the various allotropes of carbon,
Options- A. coke is the hardest, graphite is the softest
- B. diamond is the hardest, coke is the softest
- C. diamond is the hardest, graphite is the softest
- D. diamond is the hardest, lamp black is the softest Discuss
- 10. Which of the following is in liquid form at room temperature?
Options- A. Lithium
- B. Sodium
- C. Francium
- D. Cerium Discuss
General Science problems
Search Results
Correct Answer: allotropes
Correct Answer: sodium carbonate
Correct Answer: deuterium oxide
Correct Answer: red liquid
Correct Answer: magnesium
Correct Answer: helium
Correct Answer: it has a high dipole moment
Correct Answer: transition metals
Correct Answer: diamond is the hardest, graphite is the softest
Correct Answer: Francium
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