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Define molal elevation constant or ebull...

Define molal elevation constant or ebullioscopic constant.

A

the elevation in b.p. which would be produced by dissolving one mole of solute in `100`g of solvent

B

the elevation in b.p. which would be produced by dissolving `1` mole of solute in `10`g of solvent

C

the elevation in b.p. which would be produced by dissolving `1` mole of solute in `1000`g of solvent

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
`DeltaT_(b)=(1000K'_(b)xxw)/(m.W),if w//m=1`
`W=1000g.`
`DeltaT_(b)=K'_(b)`
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The boilingpoint of water in a 0.1 molal silver nitrate solution(solutionA) is x^@C . To this solution A, an equal volume of 0.1 molal aqueous barium chloride solution is added to make a mew solution B. The difference in the boiling points of water in the two solutions A and B is yxx10^(-2)"^@C (Assume: Densities of the solutions A and B are the same as that of water and soluble salts dissociate completely. Use:molal elevation constant (Ebullioscopic constant), K_b= 0.5Kkgmol^(-1) Boiling point of pure water as 100^@C ) The value of x is ---------.

The boilingpoint of water in a 0.1 molal silver nitrate solution(solutionA) is x^@C . To this solution A, an equal volume of 0.1 molal aqueous barium chloride solution is added to make a mew solution B. The difference in the boiling points of water in the two solutions A and B is yxx10^(-2)"^@C (Assume: Densities of the solutions A and B are the same as that of water and soluble salts dissociate completely. Use:molal elevation constant (Ebullioscopic constant), K_b= 0.5Kkgmol^(-1) Boiling point of pure water as 100^@C ) The value of abs(y) is ---------.

Knowledge Check

  • The units of ebullioscopic constant is.

    A
    ` K kg mol^(-1)`
    B
    ` mol kg k^(-1)`
    C
    `k mol kg^(-1)`
    D
    none of the above

  • The unit of ebullioscopic constant is

    A
    `Kg " mol"^(-1)`
    B
    K kg mol
    C
    K kg `"mol"^(-1)`
    D
    K g mol

  • The unit of ebullioscopic constant is _

    A
    `K kg "mol"^(-1) " or " K ("molality")^(-1)`
    B
    Mol `kg K^(-1) " or " K^(-1) ` (molality)
    C
    `kg "mol"^(-1)K^(-1) " or " K^(-1) ("molality")^(-1)`
    D
    K mol `kg^(-1)` or K (molality)

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    Calculate molal elevation constant for a solution containing 1.5 g solute dissolved in 250g g solvent,having elevation of boiling point 0.01. [ molecular wt. = 60]

    The unit of ebullioscopic constant is …………….. .

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