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  • Please help! Choose the correct option :a) mercury batteries using a mercury oxide cathod have a flat discharge curveb) mercury battreies are used in voltage reference in electric instrument and in platographic light metersc) silver oxide batteries a

Choose the correct option : 

a) mercury batteries using a mercury oxide cathod have a flat  discharge curve

b) mercury battreies are used in voltage reference in electric instrument and in platographic light meters 

c) silver oxide batteries are used as an alternative to mercury batteries  

  • Option 1)

    a,b

  • Option 2)

    b

  • Option 3)

    a,b,c

  • Option 4)

    a,c

 

Answers (1)

best_answer

As we have learned

Mercury Cell -

Anode - Zn - Hg amalgam cathode - paste of (HgO + C)

- wherein

Electrolyte moist paste of KOH - ZnO cathode reaction HgO(s)+H_{2}O(l)+2e^{-}\rightarrow Hg(l)+2OH^{-}

Anode reaction Zn(Hg)+2\overline{O}H(aq)\rightarrow ZnO(s)+H_{2}(l)+2e^{-}

Cell potential 1.35V

 

 Mercury batteries using mercury oxide cathod have a flat discharge curve and provide a constant voltage of 1.35 v for 95% of their lifetime 

Rest are also correct 

 


Option 1)

a,b

Option 2)

b

Option 3)

a,b,c

Option 4)

a,c

Posted by

prateek

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