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MCQs

Total Questions : 217 | Page 22 of 22 pages
Question 211. In Copper Oxide (CuO) and Carbon Monoxide (CO) reaction, oxidizing agent is
  1.    CuO
  2.    CO
  3.    Cu
  4.    CO₂
 Discuss Question
Answer: Option A. -> CuO
Answer: (a).CuO
Question 212. Change of orange color of Chromium(VI) (Cr+6) to green color of Chromium(III) (Cr+3) indicates presence of a
  1.    reducing agent
  2.    oxidizing agent
  3.    reagent
  4.    drying agent
 Discuss Question
Answer: Option A. -> reducing agent
Answer: (a).reducing agent
Question 213. Exothermic reactions are
  1.    making of chemical bond
  2.    more common reactions
  3.    burning of carbon
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Answer: (d).all of these
Question 214. If Potassium Iodide (KI) acts as oxidizing agent, change occurs from, indicates presence of
  1.    colorless to brown
  2.    colorless to blue
  3.    brown to colorless
  4.    blue to colorless
 Discuss Question
Answer: Option A. -> colorless to brown
Answer: (a).colorless to brown
Question 215. Reducing agents does not include
  1.    chlorine
  2.    carbon
  3.    potassium iodide
  4.    carbon monoxide
 Discuss Question
Answer: Option A. -> chlorine
Answer: (a).chlorine
Question 216. At high temperatures, enzymes...
  1.    act very rapidly
  2.    get denatured
  3.    form cations
  4.    form anions
 Discuss Question
Answer: Option B. -> get denatured
Answer: (b).get denatured
Question 217. When dichromate (VI) ion becomes reduced to chromium (III) ion, a change of color occurs from
  1.    purple to pink
  2.    purple to colorless
  3.    orange to purple
  4.    orange to green
 Discuss Question
Answer: Option D. -> orange to green
Answer: (d).orange to green

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