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- Question
What determines the mass number of an element?
Options- A. Number of protons
- B. Number of electrons and protons
- C. Number of protons and neutrons
- D. Number of neitrons
- Correct Answer
- Number of protons and neutrons
ExplanationThe number of protons in an isotope or an atom gives its atomic number whereas the number of protons and neutrons gives its mass number.
- 1. In a concentrated solution there is
Options- A. no solute
- B. a large amount of solvent
- C. no solvent
- D. a large amount of solute Discuss
- 2. Which ionization process requires the most energy?
Options- A. C3+ (g) ? C4+ (g) + e-
- B. C (g) ? C+ (g) + e-
- C. C2+ (g) ? C3+ (g) + e-
- D. C+ (g) ? C2+ (g) + e- Discuss
- 3. During which change is energy absorbed?
Options- A. Exothermic
- B. Endothermic
- C. Both A & B
- D. Neither A nor B Discuss
- 4. Which of the following elements is used for vulcanizing rubber?
Options- A. Sulphur
- B. Chlorine
- C. Bromine
- D. Phosphorus Discuss
- 5. Which of the following has the highest boiling point?
Options- A. 2,3-dimethylbutane
- B. 2-methylpentane
- C. 2,2-dimethylbutane
- D. 1,2-methylpentane Discuss
- 6. The principal quantum number indicates what property of an electron?
Options- A. energy of electron
- B. distance of electron from nucleus
- C. both a & b
- D. number of subshells Discuss
- 7. Dry distillation of calcium formate gives
Options- A. HCOOH
- B. CH3COOH
- C. HCHO
- D. CH3CHO Discuss
- 8. Choose the pure substance from the list below.
Options- A. Sugar
- B. Lemonade
- C. Air
- D. Sea water Discuss
- 9. Isotones have always ______
Options- A. Same number of protons
- B. Same atomic number
- C. Same number of neutron
- D. Same number of proton and same numbe of neutron Discuss
- 10. A proton is identical to _____.
Options- A. the nucleus of helium
- B. the nucleus of a hydrogen atom
- C. an alpha-particle
- D. a beta particle Discuss
Chemistry problems
Search Results
Correct Answer: a large amount of solute
Explanation:
In a concentrated solution there is a large amount of solute.
Correct Answer: C3+ (g) ? C4+ (g) + e-
Explanation:
We know that each successive IE is greater than the previous one, because each ionization process removes one electron and hence increases the total attractive force on the remaining electrons from the nucleus. Hence, C3+ (g) ? C4+ (g) + e- needs more energy.
Correct Answer: Endothermic
Explanation:
Endothermic reaction is the reaction in which energy is obserbed for the change.
Correct Answer: Sulphur
Explanation:
Vulcanization of rubber is a process of improvement of the rubber elasticity and strength by heating it in the presence of sulfur rubber much stronger, more flexible, and more resistant to heat and other environmental conditions.
Correct Answer: 2,2-dimethylbutane
Explanation:
Due to the molecules present in the 2,2-dimethylbutane are closely packed, it has the highest boiling point.
Correct Answer: both a & b
Explanation:
The principal quantum number is the property of an electron which determines the energy of electron and the distance of electron from the nucleus of an atom.
Correct Answer: HCHO
Explanation:
Dry distillation of calcium acetate and calcium formate leads to the formation of aldehydes and ketones.
Correct Answer: Sugar
Correct Answer: Same number of neutron
Correct Answer: a beta particle
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