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Inspired by Alfred Werner (1866-1919), a...

Inspired by Alfred Werner (1866-1919), a KOTA student decided to reconduct a similar experiment on unknown salt samples of `MCl_(3).xNH_(3)`. The student found that some of the chloride ions could be prdipitated as AgCl on adding silver nitrate solution. He found that this salt was of 4 years (based on colour). He labelled these complexes as A (yellow complex) B( purple complex), C (Green complex), D (violet complex).
He found that moles of AgCl precipitated (per mole of salt) in one case was 3, one case it was 2, and in two cases it was one.
He then measured the electrical conductivity of various salt solutions and found that D had the lowest value.
He then measured the boiling point of solutions of A, B, C, D and found that B had the 2nd highest boiling point, Based on the above information, answer the following questions.
The student took 2.675 g sample of A (Atomic weight of central atom=59) and dissolved it in water to form 1 L solution whose molar conductance was found to be `200" "Omega^(-1)cm^(2)mol^(-1)` What is the specific conductance of the solution ?

A

`2xx10^(-3) Omega^(-1)cm^(-1)`

B

`2xx10^(-4) Omega^(-1)cm^(-1)`

C

`0.2" "Omega^(-1)cm^(-1)`

D

`0.4" "Omega^(-1)cm^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
`A implies "M.W".=59+17xx6+35.5xx3=267.5`
`M=((2.675)/(267.5))/(1)=0.01" M",Lambda_(m)=kxx(1000)/(M)`
`k=(2000xx0.01)/(1000)=2xx10^(-3)`
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