Chemistry problems
- 1. Which of the following metal is generally used for making filaments of bulb?
Options- A. W
- B. Ag
- C. Fe
- D. Rh Also asked in: AIEEE, Bank Exams, CAT, GATE, Analyst, Bank PO
Correct Answer: W
Explanation:
W is the symbol for chemical element Tungsten or Wolfram.
It is used in making filaments of bulbs.
- 3. 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 Also asked in: Bank Exams
Correct Answer: Hydrogen
- 4. An alloy is
Options- A. a compound
- B. an allotropic form
- C. an isomer
- D. a mixture Discuss
Correct Answer: a mixture
- 5. 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
Correct Answer: an alpha particle
- 6. 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
Correct Answer: sum of neutrons and electrons
Explanation:
Atomic weight=number of neutrons+number of protons
- 7. Number of moles of CO2 present in 24 grams of carbon is
Options- A. 0.5
- B. 1
- C. 2
- D. 0.25 Discuss
Correct Answer: 2
Explanation:
1 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
- 8. 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 Also asked in: AIEEE
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.
- 9. The main element used in the vulcanisation of rubber is
Options- A. nickel
- B. copper
- C. sulphur
- D. graphite Also asked in: AIEEE, GATE
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.
- 10. A particle which is similar to electron is
Options- A. positron
- B. beta particle
- C. photon
- D. mason Discuss
Correct Answer: beta particle
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