The enthalpy of formation of two compounds A and B are -84 kJ-mol and -156 kJ-mol respectively- Which of the following statements about A and B are correct-A- A is less stable than BB- Both A and B are unstableC- Both A and B are endothermic compoundsD- A is more stable than B

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Standard XII

Chemistry

Heat of Formation

The enthalpy ...

Question

The enthalpy of formation of two compounds A and B are -84 kJ/mol and -156 kJ/mol respectively. Which of the following statements about A and B are correct?

Both A and B are endothermic compounds

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A is more stable than B

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A is less stable than B

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Both A and B are unstable

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Solution

The correct option is C A is less stable than B
B is more stable than A as it is formed by releasing more energy than A. Hence, the correct answer is option (c). To reiterate, the final energy of B will be lower since it has lost more heat and hence, that is more stable.

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Similar questions

Q. The enthalpy of formation of two compounds A and B are -84 kJ/mol and -156 kJ/mol respectively. Which of the following statements about A and B are correct?

A B

A_{2}

and

B_{2}

are diatomic molecules. If the bond enthalpies of

A_{2}, A B

and

B_{2}

are in the ratio 1 : 1 : 0.5 respectively and enthalpy of formation of

A B

from

A_{2}

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B_{2}

- 100 {kJ/mol}^{- 1}

. What is the bond enthalpy of

A_{2}

Q. Bond dissociation enthalpies of

H_{2} (g) a n d N_{2} (g)

are

436.0 k J m o l^{- 1}

and

941.3 k J m o l^{- 1}

respectively. Enthalpy of formation of

N H_{3}

(g) is

- 46.0 k J m o l^{- 1}

. What is the enthalpy of atomization of

N H_{3}

For an endothermic reaction, energy of activation is $E_{a}$ and enthalpy of reaction is $Δ H$ (both of these in kJ/mol). Minimum value of $E_{a}$ will be:

The standard enthalpy of formation

△ H_{f}^{\circ}

, of hypothetical CaCl(s) theoretically found to be

- 188 k J m o l^{- 1}

and that of

C a C l_{2} (s)

- 795 k J m o l^{- 1}

Which of the following compounds is more stable?

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The enthalpy of formation of two compounds A and B are -84 kJ/mol and -156 kJ/mol respectively. Which of the following statements about A and B are correct?

The correct option is C A is less stable than BB is more stable than A as it is formed by releasing more energy than A. Hence, the correct answer is option (c). To reiterate, the final energy of B will be lower since it has lost more heat and hence, that is more stable.

The correct option is C A is less stable than B
B is more stable than A as it is formed by releasing more energy than A. Hence, the correct answer is option (c). To reiterate, the final energy of B will be lower since it has lost more heat and hence, that is more stable.