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- Question
Which among the following is the most electronegative element?
Options- A. Flourine
- B. Bromine
- C. Iodine
- D. Oxygen
- Correct Answer
- Flourine
ExplanationFlourine is the most electro negative element due to its small atomic radius .It also has the tendency to accept an electron to complete octet configuration
- 1. Formation of anions occurs by
Options- A. loss of neutrons
- B. gain of protons
- C. gain of electrons
- D. none Discuss
- 2. The alpha-particles are
Options- A. high energy electrons
- B. positively charged hydrogen irons
- C. high energy x ray radiations
- D. double positively charged helium nuclei Discuss
- 3. The activity of rradioisotope change with
Options- A. temperature
- B. pressure
- C. chemical environment
- D. None of these Discuss
- 4. Cathode rays have
Options- A. mass only
- B. charge only
- C. no mass and no charge
- D. mass and charge both Discuss
- 5. The most abundant metal in earth crust is
Options- A. Iron
- B. magnesium
- C. calcium
- D. aluminium Discuss
- 6. Number of moles of solute present in 1 litre of solution is
Options- A. Normality
- B. Molarity
- C. Molality
- D. Formality Discuss
- 7. Milk is a
Options- A. mixture
- B. element
- C. metal
- D. None of these Discuss
- 8. Dimond is
Options- A. an element
- B. a compound
- C. a mixture
- D. a liquid Discuss
- 9. Stainless steel contains steel and
Options- A. manganese
- B. vanadium
- C. nickel
- D. chromium Discuss
- 10. Dust particles in the air of large industrial cities are removed by
Options- A. Sedimentation
- B. Electrophoresis
- C. Tyndall effect
- D. Brownian movement Discuss
Chemistry problems
Search Results
Correct Answer: gain of electrons
Correct Answer: double positively charged helium nuclei
Correct Answer: None of these
Correct Answer: mass and charge both
Correct Answer: aluminium
Correct Answer: Molarity
Explanation:
Moles of solute present in 1 litre or 1000ml of solution is called molarity
Correct Answer: mixture
Correct Answer: an element
Correct Answer: chromium
Explanation:
Stainless steel contains 18% chromium and 82% steel
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.
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