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For a reaction, aA+bBhArrcC+dD, the reac...

For a reaction, `aA+bBhArrcC+dD`, the reaction quotient `Q=([C]_(0)^(c)[D]_(0)^(d))/([A]_(0)^(a)[B]_(0)^(b))`, where `[A]_(0)`, `[B]_(0)`, `[C]_(0)`, `[D]_(0)` are initial concentrations. Also `K_(c)=([C]^(c)[D]^(d))/([A]^(a)[B]^(b))` where `[A]`, `[B]`, `[C]`, `[D]` are equilibrium concentrations. The reaction proceeds in forward direction if `Q lt K_(c)` and in backward direction if `Q gt K_(c)`. The variation of `K_(c)` with temperature is given by: `2303log(K_(C_(2)))/(K_(C_(1)))=(DeltaH)/(R)[(T_(2)-T_(1))/(T_(1)T_(2))]`.
For gaseous phase reactions `K_(p)=K_(c)(RT)^(Deltan)` where `Deltan=` moles of gaseous products `-` moles of gaseous reactants. Also `-DeltaG^(@)=2.303RT log_(10)K_(c)`.
(`A`) A hydrated salt show efflorescent nature by lossing water molecule . Under what pressure of moisture in atmosphere, `CuSO_(4)*5H_(2)O` will show efflorescence bature if
`CuSO_(4)*5H_(2)O_((s))hArrCuSO_(4)*3H_(2)O+2H_(2)O_((v))` , `K_(p)=62.72 mm^(2)`?

A

`P'_(H_(2)O)gt62.72 mm`

B

`P'_(H_(2)O)lt62.72 mm`

C

`P'_(H_(2)O)lt7.92 mm`

D

`P'_(H_(2)O)gt7.92 mm`

Text Solution

Verified by Experts

`K_(p)=(P_(H_(2)O))^(2)`
`:. P_(H_(2)O)=sqrt(62.72)=7.92mm`
If `P'_(H_(2)O lt K_(p)`, reaction will show forward reaction.
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For a reaction, aA+bBhArrcC+dD , the reaction quotient Q=([C]_(0)^(c)[D]_(0)^(d))/([A]_(0)^(a)[B]_(0)^(b)) , where [A]_(0) , [B]_(0) , [C]_(0) , [D]_(0) are initial concentrations. Also K_(c)=([C]^(c)[D]^(d))/([A]^(a)[B]^(b)) where [A] , [B] , [C] , [D] are equilibrium concentrations. The reaction proceeds in forward direction if Q lt K_(c) and in backward direction if Q gt K_(c) . The variation of K_(c) with temperature is given by: 2303log(K_(C_(2)))/(K_(C_(1)))=(DeltaH)/(R)[(T_(2)-T_(1))/(T_(1)T_(2))] . For gaseous phase reactions K_(p)=K_(c)(RT)^(Deltan) where Deltan= moles of gaseous products - moles of gaseous reactants. Also -DeltaG^(@)=2.303RT log_(10)K_(c) . Which relation is correct?

For a reaction, aA+bBhArrcC+dD , the reaction quotient Q=([C]_(0)^(c)[D]_(0)^(d))/([A]_(0)^(a)[B]_(0)^(b)) , where [A]_(0) , [B]_(0) , [C]_(0) , [D]_(0) are initial concentrations. Also K_(c)=([C]^(c)[D]^(d))/([A]^(a)[B]^(b)) where [A] , [B] , [C] , [D] are equilibrium concentrations. The reaction proceeds in forward direction if Q lt K_(c) and in backward direction if Q gt K_(c) . The variation of K_(c) with temperature is given by: 2303log(K_(C_(2)))/(K_(C_(1)))=(DeltaH)/(R)[(T_(2)-T_(1))/(T_(1)T_(2))] . For gaseous phase reactions K_(p)=K_(c)(RT)^(Deltan) where Deltan= moles of gaseous products - moles of gaseous reactants. Also -DeltaG^(@)=2.303RT log_(10)K_(c) . The equilibrium constant K_(c) for A_((g))hArrB_((g)) is 1.1 . The gas having concentration ge 1 is:

Knowledge Check

  • Assertion : If Q_c lt K_c the reaction proceeds in forward direction. Reason : K_c is independent of initial concentrations of reactants.

    A
    If both assertion and reason are true and is the correct explanation of assertion.
    B
    If both assertion and reason are true but reason is not the correct explanation of assertion.
    C
    If assertion is true but reason is false.
    D
    If both assertion and reason are false.

  • Assertion (A) : For gaseous reaction when Delta n =0 , K_(p)=K_(c) . Deltan = change in the number of gas moles Reason (R ) : For gaseous reaction, K_(p)=K_(c)(RT)^(Deltan)

    A
    Both A and R are true and R is the correct explanation of A.
    B
    Both A and R are true but R is not a correct explanation of A.
    C
    A is true but R is false
    D
    A is false but R is true.

  • The equilibirum constant K_(c) of the reaction, 2AhArrB+C is 0.5 at 25^(@)C and 1 atm. The reaction will proceed in the backward direction when concentrations [A], [B] and [C] are respectively-

    A
    `10^(-3),10^(-2) and 10^(-2) M`
    B
    `10^(-1),10^(-2) and 10^(-2) M`
    C
    `10^(-2),10^(-2) and 10^(-3) M`
    D
    `10^(-2),10^(-3) and 10^(-3) M`

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