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MCQs

Total Questions : 204 | Page 15 of 21 pages
Question 141. Electrode is
  1.    the substance which conducts electricity but remains unchanged chemically
  2.    plate which carried electricity into the liquid
  3.    a fully ionized liquid that undergoes electrolysis
  4.    all of these
 Discuss Question
Answer: Option B. -> plate which carried electricity into the liquid
Answer: (b).plate which carried electricity into the liquid
Question 142. Duration of bright-bulb can be enhanced, if along with copper
  1.    magnesium is used
  2.    the acid is more dilute
  3.    zinc
  4.    graphite
 Discuss Question
Answer: Option C. -> zinc
Answer: (c).zinc
Question 143. In a dry cell, leaking occurs because
  1.    zinc electrode has dissolved away
  2.    carbon electrode has dissolved away
  3.    magnese oxide has been used up
  4.    polarization cannot more be prevented at carbon electrode
 Discuss Question
Answer: Option A. -> zinc electrode has dissolved away
Answer: (a).zinc electrode has dissolved away
Question 144. In electrolysis of concentrated HCl, Cl₂ is given off at cathode due to
  1.    difficulty of discharging hydroxide ions
  2.    difficulty of discharging chloride ions
  3.    due to high concentration of Chloride ions
  4.    ease of discharging chloride ions compared to the hydroxide ions
 Discuss Question
Answer: Option C. -> due to high concentration of Chloride ions
Answer: (c).due to high concentration of Chloride ions
Question 145. Electricity is measured through a device called as
  1.    Ammeters
  2.    Voltmeters
  3.    Barometers
  4.    Anemometers
 Discuss Question
Answer: Option A. -> Ammeters
Answer: (a).Ammeters
Question 146. Reactivity series of metals is also called as the
  1.    preferential series
  2.    electrochemical series
  3.    electrolytic series
  4.    selective discharge series
 Discuss Question
Answer: Option B. -> electrochemical series
Answer: (b).electrochemical series
Question 147. Any reaction at an anode involves
  1.    gain of electrons
  2.    loss of electrons
  3.    gain or loss depends upon the electrolyte
  4.    formation of gases
 Discuss Question
Answer: Option B. -> loss of electrons
Answer: (b).loss of electrons
Question 148. Aluminum (Al) is preferred in overhead power cables because
  1.    it is a good conductor
  2.    it acts as an insulator, in case of lightening
  3.    it prevents accidents
  4.    it is lighter in weight
 Discuss Question
Answer: Option D. -> it is lighter in weight
Answer: (d).it is lighter in weight
Question 149. If molten Lead Bromide (PbBr₂) is electrolyzed,
  1.    at anode, brown fumes of bromide gas are given off
  2.    at anode, molten lead can be seen
  3.    at cathode, brown fumes can be seen
  4.    at cathode, lead bromide can be seen
 Discuss Question
Answer: Option A. -> at anode, brown fumes of bromide gas are given off
Answer: (a).at anode, brown fumes of bromide gas are given off
Question 150. In electrolysis of aqueous Copper Sulfate CuSO₄, at cathode
  1.    pink deposit of copper metal is deposited
  2.    hydrogen gas is given off
  3.    hydrogen ions are easier to discharge than copper ions
  4.    Cu+2 forms crystals
 Discuss Question
Answer: Option A. -> pink deposit of copper metal is deposited
Answer: (a).pink deposit of copper metal is deposited

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