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In which of the following standard entha...

In which of the following standard enthalpy of formation `(Delta H_(f)^(0))` is zero ?

A

`Br_(2) (g)`

B

`CO_(2) (g)`

C

`H_(2) O(l)`

D

`Cl_(2) (g)`

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At 25^(@)C which of the following has enthalpy of formation zero ?

Between O_(2)(g) and O_(3)(g) , whose standard enthalpy of formation (DeltaH_(f)^(0)) is taken as zero at 1 atm and 25^(@)C ?

Knowledge Check

  • Which of the following has a positive enthalpy of formation?

    A
    LiF
    B
    LiCl
    C
    LiBr
    D
    LiI

  • At 25^(@)C which of the following has enthalpy of formation zero-

    A
    `HCl(g)`
    B
    `O_(2)(g)`
    C
    `O_(3)(g)`
    D
    `NO(g)`

  • Which of the following reaction does not define standard enthalpy of formation (Delta H_f^@) ?

    A
    `C(diamond)+O_2(g)rarrCO_2(g)`
    B
    `1/2H_2(g)+1/2F_2(g)rarrHF(g)`
    C
    `N_2(g)+3H_2(g)rarr2NH_3(g)`
    D
    `CO(g)+1/2O_2(g)rarr CO_2(g)`

    • Similar Questions

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    In which of the following reactions does DeltaH^(0) at 25^(@)C indicate the standard enthalpy of formation (DeltaH_(f)^(0)) of the compound formed in each of the reactions? (2) N_(2)(g)+3H_(2)(g)to2NH_(3)(g) (2) (1)/(2)N_(2)(g)+(1)/(3)O_(3)(g)toNO(g) .

    For which of the following reactions does the standard enthalpy of reaction represent the standard enthalpy of formation of CH_(4)(g) ? Explain it. (a) C(diamond, s) +4H_(2)(g)toCH_(4)(g) (b) C(graphite, s) +O_(2)(g)toCH_(4)(g) .

    In which of the following reactions At 25^(@)C , does the standard enthalpy change correspond to the standard enthalpy of formation of H_(2)O(l) ? Give reasons. (i) H_(2)(g) +(3)/(2)O_(3)(g) to H_(2)O(l) (ii) H_(2)(g)+(1)/(2)O_(2)(g)toH_(2)O(l) (iii) 2H(g)+O_(2)(g) to H_(2)O(l) .

    In which of the following reactions, standard reaction entropy changes (DeltaS^@) is positive and standard Gibb’s energy change (DeltaG^@) decreases sharply with increasing temperature?

    Which of the following element standard enthalpy is not to be equal to zero?

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