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MCQs

Total Questions : 740 | Page 69 of 74 pages
Question 681. Volatile CFCs are used as
  1.    aerosols
  2.    propellants
  3.    solvents
  4.    all of above
 Discuss Question
Answer: Option D. -> all of above
Answer: (d).all of above
Question 682. Chlorofluorocarbon (CFC) is non-toxic and non-flammable was said by chemist
  1.    Thomas Medley
  2.    Thomas jenny
  3.    J.J Thomson
  4.    Albert Einstein
 Discuss Question
Answer: Option A. -> Thomas Medley
Answer: (a).Thomas Medley
Question 683. Chlorine reacts with cold hydroxides ions in a disproportionation reaction and results in
  1.    lowering the acidity of soil
  2.    killing the bacteria and germs in drinking water
  3.    formation of commercial bleach
  4.    none of above
 Discuss Question
Answer: Option C. -> formation of commercial bleach
Answer: (c).formation of commercial bleach
Question 684. The monomer which is used to make Poly Vinyl Chloride (PVC) is called
  1.    chloroethene
  2.    chloromethane
  3.    chloropropane
  4.    chlorobutane
 Discuss Question
Answer: Option A. -> chloroethene
Answer: (a).chloroethene
Question 685. The bond breakage in Chlorofluorocarbons (CFC) molecules releases highly reactive
  1.    chlorine radicals
  2.    chlorine free radicals
  3.    free electrons
  4.    free ions
 Discuss Question
Answer: Option B. -> chlorine free radicals
Answer: (b).chlorine free radicals
Question 686. In the periodic table, element in the second row of transition elements beneath titanium is
  1.    Zinc (Zn)
  2.    Zirconium (Zr)
  3.    Scandium (Sc)
  4.    Copper (Cu)
 Discuss Question
Answer: Option C. -> Scandium (Sc)
Answer: (c).Scandium (Sc)
Question 687. Each transition element have more than one
  1.    ion only
  2.    oxidation state only
  3.    nucleus
  4.    ion and oxidation state
 Discuss Question
Answer: Option D. -> ion and oxidation state
Answer: (d).ion and oxidation state
Question 688. Transition elements are
  1.    cobalt
  2.    zinc
  3.    scandium
  4.    chlorine
 Discuss Question
Answer: Option A. -> cobalt
Answer: (a).cobalt
Question 689. Oxidation state +2 is obtained by losing 2 electrons from
  1.    2s
  2.    4s
  3.    2p
  4.    d
 Discuss Question
Answer: Option B. -> 4s
Answer: (b).4s
Question 690. Elements found in D-block of the periodic table are known as
  1.    noble gases
  2.    transition elements
  3.    alkalis
  4.    acids
 Discuss Question
Answer: Option B. -> transition elements
Answer: (b).transition elements

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