1)What is the standard state of A in a mixture of 5% A and 95% B (A and B are bo

Question

1)What is the standard state of A in a mixture of 5% A and 95% B (A and B are both volatile liquids)?

A)What is the standard state of A in a mixture of 5% A and 95% B (A and B are both volatile liquids)?

B)Pure liquid A

C)Pure liquid B

D)A solution where the activity of a was 1

2)Why does the conductivity of a strong electrolyte like NaCl decrease with increasing concentration

A)NaCl is not completely dissociated

B)The 'drag' of the ionic atmosphere increases with concentration

C)As concentration increases, ions start to pair up

D)The molar conductivity is found by dividing the conductivity by the concentration so as concnetration increase it is expected that molar conductivity would decrease

3)The transport number of H+ in a HCl solution is 0.815. Why does the hydrogen ion carry such a high proportion of the currrent?

A)The hydrogen ion has a positive charge

B)The hydrogen ion is smaller than the chloride ion

C)The proton can effectively move by moving electrons

D)The chloride ion is heavier

Explanation / Answer

Q 1) (B)

The standard state of each component A in the mixture is that of pure A. The activity of pure A is 1.

Q 2) (C)

When concentration increases, ions start to pair up,which decreases the conductivity of NaCl

Q 3) (B)

Hydrogen carries high poportion of current as the hydrogen ion is smaller than the chloride ion. This makes the ionic mobility of H+ higher than cl-.

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