Discussion
Home ‣ General Knowledge ‣ Chemistry Comments
- Question
Which of the following is used to preserve specimens in the biology laboratory?
Options- A. Phenol
- B. Benzaldehyde
- C. Formaldehyde
- D. Acetic acid
- Correct Answer
- Formaldehyde
ExplanationA 40% solution of Formaldehyde known as Formalin is used in the preservation of biological specimens because of its hardening action on proteins.
- 1. 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
- 2. "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
- 3. A mixture of sand and naphthalene can be seperated by __________
Options- A. Fractional distillation
- B. Sublimation
- C. Chromatography
- D. Any of them Discuss
- 4. Dust particles in the air of large industrial cities are removed by
Options- A. Sedimentation
- B. Electrophoresis
- C. Tyndall effect
- D. Brownian movement Discuss
- 5. Stainless steel contains steel and
Options- A. manganese
- B. vanadium
- C. nickel
- D. chromium Discuss
- 6. 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
- 7. Neutrino has
Options- A. charge +1, mass 1
- B. charge 0, mas 0
- C. charge -1,mass 1
- D. charge 0, mass 1 Discuss
- 8. 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
- 9. 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 Discuss
- 10. What is the heaviest noble gas?
Options- A. krypton
- B. radon
- C. helium
- D. xenon Discuss
Chemistry problems
Search Results
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.
Correct Answer: Zeroth law of thermodynamics
Correct Answer: Sublimation
Correct Answer: Electrophoresis
Explanation:
Dust particles such as coal dust(smoke) are fine particle of a solid (carbon in the case of smoke) dispersed in air. They are colloidal systems and the particles are charged either positive or negative. In an applied electrical field, they are attracted towards the opposite electrodes. Movement of the particles towards the electrodes is known as 'electrophoresis'. Hence electrophoresis is applied to remove smoke within the chimeny itself without allowing it to escape into the air and cause nuisance.
Correct Answer: chromium
Explanation:
Stainless steel contains 18% chromium and 82% steel
Correct Answer: Rutherford
Correct Answer: charge 0, mas 0
Correct Answer: Isobars
Correct Answer: Electrons orbit around the nucleus
Explanation:
Electrons orbit around the nucleus is correct about them.
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.
Comments
There are no comments.More in General Knowledge:
Programming
Copyright ©CuriousTab. All rights reserved.