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Fuel cell - class-XI

fuel cell

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Questions

Question 1 Multiple Choice (Single Answer)

The overall reaction of a hydrogen-oxygen fuel cell is:

  1. $2H _{2(g)}+O _{2(g)}\rightarrow 2H _2O _{(l)}$
  2. $2H _{2(g)}+4OH^- _{(aq)}\rightarrow 4H _2O _{(l)}+4e^-$
  3. $O _{2(g)}+2H _2O _{(l)}+4e^-\rightarrow 4OH^- _{(aq)}$
  4. $4OH^- _{(aq)}+4e^-\rightarrow 2H _2O _{(l)}$
Question 2 Multiple Choice (Single Answer)

$H _{2}-O _{2}$ fuel cell is:

  1. primary cell
  2. secondary cell
  3. both
  4. cant be predicted
Question 3 Multiple Choice (Single Answer)

Hydrogen -Oxygen fuel cells are used in space craft to supply:

  1. power for heat and light
  2. electrical power
  3. oxygen
  4. water
Question 4 Multiple Choice (Single Answer)

In which reactants are not contained within the cell but are continuously supplied from external source?

  1. Fuel cell
  2. Dry cell
  3. Lithium battery
  4. Lead storage battery
Question 5 Multiple Choice (Single Answer)

Which one of the following cells can convert chemical energy of $O _{2}$ and $H _{2}$ directly into electrical energy:

  1. mercury cell
  2. danicell cell
  3. fuel cell
  4. lead storage cell
Question 6 Multiple Choice (Single Answer)

Which of the following statements is true for fuel cells ?

  1. They are more efficient
  2. They are free from pollution
  3. They run till reactants are active
  4. All of the above
Question 7 Multiple Choice (Single Answer)

In fuel cell oxidants used are:

  1. $O _{2}$
  2. $H _{2}O _{2}$
  3. $HNO _{3}$
  4. All
Question 8 Multiple Choice (Single Answer)

The efficiency of a fuel cell is given by:

  1. $\frac{\Delta S}{\Delta G}$
  2. $\frac{\Delta H}{\Delta G}$
  3. $\frac{\Delta G}{\Delta S}$
  4. $\frac{\Delta G}{\Delta H}$
Question 9 Multiple Choice (Single Answer)

If a fuel cell methanol is used as fuel and oxygen gas is used as an oxidiser. The reaction is $CH _3OH _{(l)} +\frac{3}{2}O _{2(g)} \rightarrow CO _{2(g)}+2H _2O _{(g)}$ at 298 K standard Gibb's energies of formation for $CH _3OH(l)H _2O(l)$ and $CO _2(g)$ are $-166.2$, $-237.2$ and $394.4$ $KJ \ mol^{-1}$ respectively. If standard enthalpy of combustion of methanol is -726 KJ $mol^{-1}$, efficieny of the fuel cell will be 

  1. 80%
  2. 87%
  3. 90%
  4. 97%
Question 10 Multiple Choice (Single Answer)

What is the approximate value of $ \Delta S^{\circ} $ for the fuel cell reaction at $ 25^{\circ}$? 

  1. $ -0.1624\,JK^{-1}$
  2. $ -162.4\,JK^{-1} $
  3. $ +162.4\,JK^{-1} $
  4. $ +0.1624\,JK^{-1} $
Question 11 Multiple Choice (Single Answer)

Which of the following is an example of simple fuel cell?

  1. Lead storage battery
  2. Leclanche cell
  3. $H _2 O _2$
  4. All of the above
Question 12 Multiple Choice (Single Answer)

Identify the reaction taking place at cathode in fuel cell.

  1. ${O} _{2}+2{H} _{2}O+4{e}^{-}\rightarrow 4{OH}^{-}$
  2. $2{H} _{2}+4{OH}^{-}\rightarrow 4{H} _{2}O+4{e}^{-}$
  3. ${O} _{2}+2{H} _{2}O+4{e}^{-}\rightarrow 4{OH}^{-}+{H}^{+}$
  4. $4{H} _{2}O+4{e}^{-}\rightarrow 2{H}^{2}+4{OH}^{-}$
Question 13 Multiple Choice (Single Answer)

Which of the following reactions is used to make a fuel cell?

  1. $Cd(s) + 2Ni(OH) _{3} (s) \rightarrow CdO(s) + 2Ni(OH) _{2} (s) + H _{2}O(l)$
  2. $Pb(s) + PbO _{2}(s) + 2H _{2} SO _{4}(aq) \rightarrow 2PbSO _{4}(s) + 2H _{2}O(l)$
  3. $2H _{2}(g) + O _{2}(g) \rightarrow 2H _{2}O(l)$
  4. $2Fe(s) + O _{2}(g) + 4H^{+} (aq) \rightarrow 2Fe^{2+}(aq) + 2H _{2}O(l)$
Question 14 Multiple Choice (Single Answer)

An examples of a simple fuel cell is:

  1. lead storage battery
  2. $H _{2} - O _{2}$ cell
  3. daniell cell
  4. lechlanche cell
Question 15 Multiple Choice (Multiple Answers)

Fuel cell involves which of the following reaction(s) ?

  1. $O _{2}(g) + 2H _{2}O(l) + 4e^{-} \rightarrow 4OH^{-}(aq.)$ (at cathode)
  2. $O _{2}(g) + 2H _{2}O(l) + 4e^{-}\rightarrow 4OH^{-}(aq.)$ (at anode)
  3. $2H _{2}(g) + 4OH^{-}(aq.) \rightarrow 4H _{2}O(l) + 4e^{-}$ (at anode)
  4. $2H _{2}(g) + 4OH^{-}(aq.) \rightarrow 4H _{2}O(l) + 4e^{-}$ (at cathode)
Question 16 Multiple Choice (Single Answer)

In a fuel cell the fuel is fed to which compartment?

  1. Anode compartment
  2. Cathode compartment
  3. Both the compartments
  4. None of the above
Question 17 Multiple Choice (Single Answer)

In _________ cells, reactants are continuously supplied energy which can be withdrawn indefinately until outside supply of reactant is maintained. These cells are more efficient than conventional batteries and moreover, these are eco-friendly. 

  1. fuel
  2. galvanic
  3. primary
  4. secondary
Question 18 Multiple Choice (Multiple Answers)

In hydrogen fuel cell the catalyst used is/are:

  1. $Ag$
  2. $Fe$
  3. $Pt$
  4. $Zn$
Question 19 Multiple Choice (Multiple Answers)

Which of the following statements regarding fuel cell is (are) true?

  1. They have efficiency of about 60-70%
  2. There efficiency is less then conventional methods
  3. They do not cause pollution
  4. They can supply indefinite amount of energy until outside supply of reactants is maintained
Question 20 Multiple Choice (Single Answer)

In a $H _2 - O _2$ fuel cell, combustion of hydrogen occurs to:

  1. remove adsorbed oxygen from electrode surface
  2. create potential difference between the two electrodes
  3. produce high purity water
  4. generate heat
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