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- Question
A mixture of sand and naphthalene can be seperated by __________
Options- A. Fractional distillation
- B. Sublimation
- C. Chromatography
- D. Any of them
- Correct Answer
- Sublimation
- 1. Dust particles in the air of large industrial cities are removed by
Options- A. Sedimentation
- B. Electrophoresis
- C. Tyndall effect
- D. Brownian movement Discuss
- 2. Stainless steel contains steel and
Options- A. manganese
- B. vanadium
- C. nickel
- D. chromium Discuss
- 3. Dimond is
Options- A. an element
- B. a compound
- C. a mixture
- D. a liquid Discuss
- 4. Milk is a
Options- A. mixture
- B. element
- C. metal
- D. None of these Discuss
- 5. Number of moles of solute present in 1 litre of solution is
Options- A. Normality
- B. Molarity
- C. Molality
- D. Formality Discuss
- 6. "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
- 7. 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
- 8. Which of the following is used to preserve specimens in the biology laboratory?
Options- A. Phenol
- B. Benzaldehyde
- C. Formaldehyde
- D. Acetic acid Discuss
- 9. 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
- 10. Neutrino has
Options- A. charge +1, mass 1
- B. charge 0, mas 0
- C. charge -1,mass 1
- D. charge 0, mass 1 Discuss
Chemistry problems
Search Results
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: an element
Correct Answer: mixture
Correct Answer: Molarity
Explanation:
Moles of solute present in 1 litre or 1000ml of solution is called molarity
Correct Answer: Zeroth law of thermodynamics
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: 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.
Correct Answer: Rutherford
Correct Answer: charge 0, mas 0
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