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MCQs

Total Questions : 273 | Page 26 of 28 pages
Question 251. Enthalpy of a system is measured in
  1.    Joule
  2.    Kilojoule
  3.    Electron volt
  4.    Kilowatt hour
 Discuss Question
Answer: Option A. -> Joule
Answer: (a).Joule
Question 252. In neutral or acidic solution, water or hydrogen ion may be added for balancing
  1.    Hydrogen and Oxygen atom
  2.    Oxygen and nitrogen atom
  3.    Oxygen and hydrogen
  4.    All of above
 Discuss Question
Answer: Option C. -> Oxygen and hydrogen
Answer: (c).Oxygen and hydrogen
Question 253. Enthalpy is equal to
  1.    E + PV
  2.    E - PV
  3.    E + RT
  4.    E + RT
 Discuss Question
Answer: Option A. -> E + PV
Answer: (a).E + PV
Question 254. To balance Al(OH)₃ + HNO₃ → Al(NO₃)₃ + H₂O, number of Al(OH)₃ molecules will be
  1.    1
  2.    2
  3.    3
  4.    4
 Discuss Question
Answer: Option B. -> 2
Answer: (b).2
Question 255. In Na₂CO₃.10H₂O, percentage of water is
  1.    0.5009
  2.    0.1699
  3.    0.6507
  4.    0.6294
 Discuss Question
Answer: Option D. -> 0.6294
Answer: (d).0.6294
Question 256. Formula of carbonic acid is
  1.    HCO₂
  2.    HCHO₃
  3.    H₂CO₂
  4.    H₂CO₃
 Discuss Question
Answer: Option D. -> H₂CO₃
Answer: (d).H₂CO₃
Question 257. All of these radicals have a valency of 1, except
  1.    OH
  2.    CO₃
  3.    NO₃
  4.    HCO₃
 Discuss Question
Answer: Option B. -> CO₃
Answer: (b).CO₃
Question 258. A white smoke consisting of fine white solid particles is formed by
  1.    propane
  2.    butane
  3.    magnesium oxide
  4.    tin oxide
 Discuss Question
Answer: Option C. -> magnesium oxide
Answer: (c).magnesium oxide
Question 259. The simplest whole number ratio of atoms of each element in the molecule of a compound is called
  1.    Empirical formula
  2.    Molecular formula
  3.    Atomic number
  4.    Mass number
 Discuss Question
Answer: Option A. -> Empirical formula
Answer: (a).Empirical formula
Question 260. Calorimeter is made up of
  1.    Silver
  2.    Iron
  3.    Gold
  4.    Copper
 Discuss Question
Answer: Option D. -> Copper
Answer: (d).Copper

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