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- Question
Number of moles of CO2 present in 24 grams of carbon is
Options- A. 0.5
- B. 1
- C. 2
- D. 0.25
- Correct Answer
- 2
Explanation1 mole of CO2 contain 12gms of carbon and 44 gms of CO2
therefore 24 gms of carbon is present in 88 gms of CO2 or 2 moles of CO2
- 1. Atomic weight of an element is given by
Options- A. sum of neutrons and electrons
- B. sum of neutrons and protons
- C. only neutrons
- D. only protons Discuss
- 2. A particle which is four times in mass and two times in charge that of proton is
Options- A. helium atom
- B. an alpha particle
- C. deuteron
- D. tritium Discuss
- 3. An alloy is
Options- A. a compound
- B. an allotropic form
- C. an isomer
- D. a mixture Discuss
- 4. Which of the following is NOT a primary green house gas in the earth's atmosphere?
Options- A. Methane
- B. Ozone
- C. Nitrous oxide
- D. Hydrogen Discuss
- 5. Triple point of water corresponds to
Options- A. 1 atm, 0°C
- B. 1 atm, 0.01°C
- C. 1 atm, 0 K
- D. 4.58 Torr, 0.01°C Discuss
- 6. Chloroform used as anaesthetic should be preserved in the dark in tightly stoppered bottles because otherwise
Options- A. it becomes coloured
- B. it gets evaporated in air
- C. it gets oxidised to phosgene
- D. it gets decomposed to chloropicrin Discuss
- 7. The main element used in the vulcanisation of rubber is
Options- A. nickel
- B. copper
- C. sulphur
- D. graphite Discuss
- 8. A particle which is similar to electron is
Options- A. positron
- B. beta particle
- C. photon
- D. mason Discuss
- 9. Which one of the following can be used to confirm wether drinking water contains a gamma emitting isotope or not
Options- A. Microscope
- B. Scintillation counter
- C. Lead plate
- D. pectrophotometer Discuss
- 10. The freezing point of water at 760mm pressure is
Options- A. 0 K
- B. 273 K
- C. 273 C
- D. -273 C Discuss
Chemistry problems
Search Results
Correct Answer: sum of neutrons and electrons
Explanation:
Atomic weight=number of neutrons+number of protons
Correct Answer: an alpha particle
Correct Answer: a mixture
Correct Answer: Hydrogen
Correct Answer: 4.58 Torr, 0.01°C
Correct Answer: it gets oxidised to phosgene
Explanation:
Chloroform, is easily oxidised to the highly poisonous gas known as phosgene or carbonyl chloride COCl2. Hence if it is used as anaesthetic it should be kept free from sunlight and air.
Correct Answer: sulphur
Explanation:
In vulcanization, cruder rubber is heated with 3% sulphur at about for for 2-3 hours.
Vulcanised rubber is a vastly improved product.
Correct Answer: beta particle
Correct Answer: Scintillation counter
Correct Answer: 273 K
Explanation:
K is degree kelvin
Zero K corresponds to -273 K = C + 273
The freezing point of water being 0 C, on the kelvin scale it is 0 C + 273 K
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