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Neela Karpe
Asked: 2022-11-08T18:08:06+05:30 In:

The enthalpies of elements in their standard states are taken as zero. The enthalpy of formation of a compound:

(a) is always negative

(b) is always positive

(c) may be positive or negative

(d) is never negative

The enthalpies of elements in their standard states are taken as zero. The enthalpy of formation of a compound:

(a) is always negative

(b) is always positive

(c) may be positive or negative

(d) is never negative

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  1. (c) May be positive or negative.

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Kasturi Palan
Asked: 2022-11-04T12:06:12+05:30 In:

The enthalpies of elements in their standard states are taken as zero. The enthalpy of formation of a compound
A. is always negative
B. is always positive
C. may be positive or negative
D. is never negative

The enthalpies of elements in their standard states are taken as zero. The enthalpy of formation of a compound
A. is always negative
B. is always positive
C. may be positive or negative
D. is never negative
Parabola
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  1. Correct Answer – C
    The enthalpy of formation of a compound may be positive or negative as it can be exothermic or endothermic process.

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Ghanshyam Borah
Asked: 2022-11-02T15:47:45+05:30 In:

The enthalpies of elements in their standard states are takeen as zero. The enthalpy of formation of a compound
A. is always negative
B. is always positive
C. may be positive or negative
D. is never negative

The enthalpies of elements in their standard states are takeen as zero. The enthalpy of formation of a compound
A. is always negative
B. is always positive
C. may be positive or negative
D. is never negative
Parabola
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1 Answer

  1. Correct Answer – c
    Combination of elements to form a compound can be exothermic or endothermic`( e.g., C + O_(2) rarrCO_(2)` is exothermic whereas `C + 2S rarrCS_(2)` is endothermic ). Hence, enthalpy of formation can be `+ve` or `-ve`.

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