Chemistry problems
- 1. During which change is energy absorbed?
Options- A. Exothermic
- B. Endothermic
- C. Both A & B
- D. Neither A nor B Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: Endothermic
Explanation:
Endothermic reaction is the reaction in which energy is obserbed for the change.
- 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- Also asked in: AIEEE, Bank Exams, GATE, Analyst, Bank Clerk
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.
- 3. 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 Also asked in: CAT, Analyst, Bank Clerk, Bank PO, AIEEE, Bank Exams
Correct Answer: a large amount of solute
Explanation:
In a concentrated solution there is a large amount of solute.
- 4. 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 Also asked in: AIEEE, Bank Exams, GATE, Analyst, Bank Clerk, Bank PO
Correct Answer: Number of protons and neutrons
Explanation:
The number of protons in an isotope or an atom gives its atomic number whereas the number of protons and neutrons gives its mass number.
- 5. 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 Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
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.
- 6. Dry distillation of calcium formate gives
Options- A. HCOOH
- B. CH3COOH
- C. HCHO
- D. CH3CHO Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: HCHO
Explanation:
Dry distillation of calcium acetate and calcium formate leads to the formation of aldehydes and ketones.
- 7. Choose the pure substance from the list below.
Options- A. Sugar
- B. Lemonade
- C. Air
- D. Sea water Also asked in: AIEEE, Bank Exams, CAT, Analyst, Bank Clerk, Bank PO
Correct Answer: Sugar
- 8. 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 Also asked in: Bank Exams, GATE, Bank Clerk, Bank PO
Correct Answer: Same number of neutron
- 9. 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 Also asked in: Bank Exams
Correct Answer: a beta particle
- 10. An ? particle is _____.
Options- A. A hydrogen molecule
- B. A helium nucleus
- C. An atom of hydrogen
- D. A proton Also asked in: Bank Exams
Correct Answer: A helium nucleus
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