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E^(@) (Ni^(2+)//NI) = -0.25 "volt", E^(@...

`E^(@) (Ni^(2+)//NI) = -0.25 "volt", E^(@) (Au^(3+)//Au) = 1.50 "volt"`. The emf of the voltaic cell, `Ni|Ni^(2+) (1.0M) || Au^(3+) (1.0 M)|Au` is :

A

1.25 volt

B

`-1.75 "volt"`

C

1.075 volt

D

4.0 volt

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The correct Answer is:
C
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E^(@)(Ni^(2+)//Ni) =- 0.25 volt, E^(@)(Au^(3+)//Au) = 1.50 volt. The emf of the voltaic cell Ni|Ni^(2+) (1.0M)||Au^(3+)(1.0M)|Au is:-

The potential of the cell V(s)|V^(3+)(aq., 0.0011 M) ||Ni^(2+)(aq., 0.24 M)||Ni(s) is

The emf of the cell, Ni|Ni^(2+)(1.0M)||Ag^(+)(1.0M)|Ag [E^(@) for Ni^(2+)//Ni =- 0.25 volt, E^(@) for Ag^(+)//Ag = 0.80 volt] is given by : [E^(@) for Ag^(+)//Ag = 0.80 volt]

These question consist of two statements each, printed as Assertion and Reason. While answering these questions you are required to choose any one of the following four responses : Ni//Ni^(2+) (1.0 M) || Au^(3+) (1.0 M) | Au , for this cell emf is 1. 75 V if E_(Au^(3+)//Au)^@ =1.50 and E_(Ni^(3+)//Ni)^2 =0.25 V . Emf of the cell =E_("cathode")^@- E_("anode")^@ .

Given E_(Ag^(+)//Ag)^(@) = +0.8V , E_(Ni^(+2)//Ni)^(@) = -0.25V . Which of the folowing statements is true?

Ni|Ni^(2+)(1.0M)||Au^(3+)(1.0M)| Au (where E^(@) for Ni^(2+)//Niis -0.25and V and E^(@) for Au^(3+)//Au is (0.150V). What is the emf of the cell ?

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