Chemistry problems
- 1. The electrochemical cell stops working after some time because ________
Options- A. Electrode potential of both the electrodes becomes zero
- B. One of electrodes completely vanishes
- C. Electrode potential of both electrodes equalizes
- D. The reaction reverses its direction Discuss
Correct Answer: Electrode potential of both electrodes equalizes
- 2. A ?breath test? used by traffic police to check drunken driving uses ____?
Options- A. Turmeric on filter paper
- B. Silica gel coated with silver nitrate
- C. potassium permanganate-sulphuric acid
- D. Potassium dichromatic-sulphuric acid Also asked in: AIEEE
Correct Answer: Potassium dichromatic-sulphuric acid
- 3. Cobalt - 60 is commonly used in radiation therapy because it emits
Options- A. alpha - rays
- B. beta rays
- C. gamma rays
- D. X - rays Discuss
Correct Answer: gamma rays
- 4. The M.K.S. system was first introduced by
Options- A. archimedes
- B. Eienstein
- C. Newton
- D. Giorgi Discuss
Correct Answer: Giorgi
- 5. The enzyme that converts glucose to ethyl alcohol is
Options- A. Maltase
- B. Zymase
- C. Diastase
- D. Invertase Also asked in: AIEEE, Bank Exams, Bank Clerk
Correct Answer: Zymase
- 6. Which one is not metal
Options- A. sulpher
- B. sugar
- C. nitogen
- D. all of these Discuss
Correct Answer: all of these
- 7. Among the following the maximum covalent character is shown by the compound (1) MgCl2 (2) FeCl2 (3) SnCl2 (4) AlCl3
Options- A. Option 1
- B. Option 2
- C. Option 3
- D. Option 4 Also asked in: AIEEE
Correct Answer: Option 4
Explanation:
According to Fajans rule, cation with greater charge and smaller size favours covalency.
- 8. A radioactive substance has a half life of four months, three-fourth of the substance would decay in
Options- A. 3 months
- B. 4 months
- C. 8 months
- D. 12 months Discuss
Correct Answer: 8 months
- 9. The isotopes of chlorine with mass number 35 and 37 exist in the ratio of
Options- A. 1:2
- B. 2:3
- C. 3:1
- D. 3:4 Discuss
Correct Answer: 3:1
- 10. Which one is the pure element
Options- A. glass
- B. cement
- C. sodium
- D. None of these Discuss
Correct Answer: sodium
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