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System, Surroundings, Intensive, Extensive Properties

The symbols ...

Question

The symbols $F . H . S . V_{m}$ and $E^{o}$ denote Helmholtz free energy, enthalpy, entropy, molar volume and standard electrode potential, respectively. The correct classification of the properties is:

A

F . H . S

are intensive;

V_{m}

and

E^{o}

are extensive

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B

F . H . S

are extensive;

V_{m}

and

E^{o}

are intensive

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C

F . H . S

and

V_{m}

are intensive;

E^{o}

are extensive

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D

F . H . S

and

E^{o}

are extensive;

V_{m}

are intensive

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Solution

The correct option is B $F . H . S$ are extensive; $V_{m}$ and $E^{o}$ are intensive
Extensive properties :- The properties which depend on the amount of matter are called extensive properties.
Intensive properties :- The properties which depend only on the nature of matter but not on the quantity of matter are called intensive properties.
Here, F, H and S depend on the quantity of matter and are therefore extensive properties. $V_{m}$ and $E^{0}$ depends only on the nature of matter and are therefore intensive properties.

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Q. Pairs of electrodes and their corresponding standard electrode potentials are given. Arrange the cells constructed by these electrodes in increasing order of emf values.

(a) E l e c t r o d e \to A, E^{o} = - 2.92 V

E l e c t r o d e \to B, E^{o} = - 2.71 V

(b) E l e c t r o d e \to C, E^{o} = - 0.760 V

E l e c t r o d e \to D, E^{o} = - 0.44 V

(c) E l e c t r o d e \to B, E^{o} = - 2.71 V

E l e c t r o d e \to D, E^{o} = - 0.44 V

(d) E l e c t r o d e \to A, E^{o} = - 2.92 V

E l e c t r o d e \to C, E^{o} = - 0.76 V

Standard electrode potential is a intensive property or extensive property ? Give reasons.

Q. The standard electrode potentials of the electrodes are given below. Arrange them in decreasing order of ease of oxidation:

(a) E l e c t r o d e - I, E^{o} = - 2.89 V

(b) E l e c t r o d e - I I, E^{o} = - 0.16 V

(c) E l e c t r o d e - I I I, E^{o} = 0.77 V

(d) E l e c t r o d e - I V, E^{o} = - 2.93 V

(e) E l e c t r o d e - V, E^{o} = - 1.67 V

Q. Standard reduction potentials of the half reactions are given below:

F_{2 (g)} + 2 e^{-} \to 2 F_{(a q)}^{-}; E^{o} = + 2.85 V

{C l}_{2 (g)} + 2 e^{-} \to 2 {C l}_{(a q)}^{-}; E^{o} = + 1.36 V

{B r}_{2 (l)} + 2 e^{-} \to 2 {B r}_{(a q)}^{-}; E^{o} = + 1.06 V

I_{2 (g)} + e^{-} \to 2 I_{(a q)}^{-}; E^{o} = + 0.53 V

The strongest oxidising and reducing agents respectively are:

Q. The standard electrode potential values,

E^{o}

A l^{3 +} / A l

T l^{3 +} / T l

- 1.66 V

+ 1.26 V

respectively. Select the correct statement.

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