Discussion
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- Question
Elements A, B and C occur as Dobereiners triads. If the atomic mass of A is 7 and that of C is 39, what will be the atomic mass of B?
Options- A. 20
- B. 40
- C. 23
- D. 12
- Correct Answer
- 20
- 1. Who among the following laid the foundation of chemical sciences by establishing two important laws of chemical combination?
Options- A. Joseph L. Proust
- B. Antoine L. Lavoisier
- C. Ernest Rutherford
- D. Democritus Discuss
- 2. Chlorine gas is used in the manufacture of:
Options- A. Baking powder
- B. Bleaching powder
- C. Baking soda
- D. Washing soda Discuss
- 3. If the atomic number of Krypton is 36, then its electronic configuration is:
Options- A. 2,8,18,8
- B. 2,8,20,6
- C. 2,18,16
- D. 2,18,8,8 Discuss
- 4. The main cause of rancidity in foods is the ____ of fats and oils.
Options- A. hydrolysis
- B. clarification
- C. reduction
- D. oxidation Discuss
- 5. Which of the following is essential for the synthesis of thyroxin?
Options- A. Potassium
- B. Calcium
- C. Iodine
- D. Sodium Discuss
- 6. Metals reacts with acids to give:
Options- A. a salt and chlorine
- B. a salt and hydrogen
- C. a salt and water
- D. a salt and base Discuss
- 7. What is the percentage of oxygen in Al2(SO4)3 ?
Options- A. 57.7%
- B. 56.1%
- C. 53.1%
- D. 52.6% Discuss
- 8. ........... as is used as an illuminating gas.
Options- A. Methyl
- B. Propane
- C. Butene
- D. Ethyne Discuss
- 9. ............. elements have the largest atoms
Options- A. F
- B. O
- C. H
- D. Li Discuss
- 10. ....... is displaced when zinc is added to the solution of copper sulphate
Options- A. Copper
- B. Hydrogen
- C. Zinc
- D. Sulphate Discuss
Chemistry problems
Search Results
Correct Answer: Antoine L. Lavoisier
Correct Answer: Bleaching powder
Correct Answer: 2,8,18,8
Correct Answer: oxidation
Correct Answer: Iodine
Correct Answer: a salt and hydrogen
Correct Answer: 56.1%
Correct Answer: Propane
Correct Answer: Li
Correct Answer: Copper
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