Chemistry problems
- 1. "If a system A is in thermal equilibrium with B and B is in thermal equilibrium with C, then A and C are in equilibrium with each other". This is a statement of
Options- A. Cyclic rute
- B. Zeroth law of thermodynamics
- C. First law of thermodynamics
- D. Second law of thermodynamics Discuss
Correct Answer: Zeroth law of thermodynamics
- 2. A mixture of ethyl alcohol and water can be seperated by
Options- A. evaporation
- B. sublimation
- C. using a seperating funnel
- D. fractional distillation Discuss
Correct Answer: fractional distillation
Explanation:
Fractional distillation is the process of seperation of a mixture of two or more liquids into the different fractions, which differ fairly widely in their boiling points. The liquid with a lower boiling point will be vaporized first and hence would be the distillate (first fraction). Eg. Ethyl alcohol has a boiling point of and water . When a mixture of these two liquids is heated, alcohol vaporizes first and is collected separately as the distillate.
- 3. Which of the following is used to preserve specimens in the biology laboratory?
Options- A. Phenol
- B. Benzaldehyde
- C. Formaldehyde
- D. Acetic acid Discuss
Correct Answer: Formaldehyde
Explanation:
A 40% solution of Formaldehyde known as Formalin is used in the preservation of biological specimens because of its hardening action on proteins.
- 4. Discovery of the nucleus of an atom was due to the experiment carried out by
Options- A. Bohr
- B. Rutherford
- C. Moseley
- D. Thomson Discuss
Correct Answer: Rutherford
- 5. Neutrino has
Options- A. charge +1, mass 1
- B. charge 0, mas 0
- C. charge -1,mass 1
- D. charge 0, mass 1 Discuss
Correct Answer: charge 0, mas 0
- 6. The atoms of the elements having same mass number but different atomic number are called
Options- A. Isotopes
- B. Isobars
- C. Isotones
- D. Isomers Discuss
Correct Answer: Isobars
- 7. Which statement best describes electrons?
Options- A. Electrons orbit around the nucleus
- B. Electrons are composed of protons and neutrons
- C. Electrons reside in the nucleus
- D. Electrons have a positive charge Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk
Correct Answer: Electrons orbit around the nucleus
Explanation:
Electrons orbit around the nucleus is correct about them.
- 8. What is the heaviest noble gas?
Options- A. krypton
- B. radon
- C. helium
- D. xenon Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: radon
Explanation:
The seven elements ? helium, neon, argon, krypton, xenon, radon, and oganesson of Group 18 of the periodic table are Noble or Inert gases.
Radon is the heaviest and Helium is the lightest gases of the noble gases.
- 9. What is the primary component of natural gas?
Options- A. Nitrogen
- B. Ethane
- C. Propane
- D. Methane Also asked in: AIEEE, Bank Exams, Analyst, Bank Clerk, Bank PO
Correct Answer: Methane
Explanation:
Natural gas is primarily composed of methane, but also contains ethane, propane, and heavier hydrocarbons.
Natural gas is a colorless, tasteless, odorless, and non-toxic gas. Because it is odorless, mercaptan is added to the natural gas, in very small amounts to give the gas a distinctive smell of rotten eggs. This strong smell can alert you of a potential gas leak.
It also contains small amounts of nitrogen, carbon dioxide, hydrogen sulphide and trace amounts of water.
- 10. Which of the following is a false statement?
Options- A. As bond order increases the strength of the bond increases
- B. Bond order is proportional to the bond length
- C. Molecules with negative bond order are highly unstable
- D. Bond order is inversely proportional to the bond length Also asked in: Analyst, Bank Clerk, Bank PO, AIEEE, Bank Exams, CAT, GATE
Correct Answer: Bond order is proportional to the bond length
Explanation:
Bond order is proportional to the bond length is a False statement since Bond order is inversely proportional to the bond length.
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