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Molarity and molality of a solution of c...

Molarity and molality of a solution of caustic soda are respectively `11.12 M` and `94.12 m`. The density of the solution is

A

` 0.556 g mL^(-1) `

B

` 5.56 g mL^(-1) `

C

` 55.6 gmL^(-1) `

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
` d = M((1)/(m)+("molar mass of solute")/(1000))`
`d = 11.12 ((1)/(94.12)+(40)/(1000))`
`=0.556 g mL^(-1) `
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Knowledge Check

  • Statement-1 : Molarity of a solution and molality of a solution both change with density. Statement-2 : Density of the solution changes when percentage by mass of solution changes.

    A
    Statement-1 : is True, Statement-2 : is True, Statement-2 : is a correct explanation for Statement-1 :
    B
    Statement-1 : is True, Statement-2 : is True, Statement-2 : is NOT a correct explanation for Statement-1 .
    C
    Statement-1 : is Ture, Statement-2 : is False.
    D
    Statement-1 : is False, Statement-2 : is True.

  • White P when boiled with strong solution of caustic soda produces

    A
    phosphine
    B
    Posh acid
    C
    Phosphorus acid
    D
    None

  • Assertion: For calculating the molality or the mole fraction of solute, if the molarity is known, it is necessary to know the density of the solution. Reason: Molality, molarity and the mole fraction of solute can be calculated from the weight percentage and the density of the solution.

    A
    (a)If both assertion and reason are true and the reason is the correct explanation of the assertion.
    B
    (b)If both assertion and reason are true and the reason is not the correct explanation of the assertion.
    C
    (c )If the assertion is true but reason is false.
    D
    (d)If assertion is false but reason is true.

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