Assertion :Enthalpy of formation of $H C l$ is equal to bond energy of $H C l$ . Because Reason: Enthalpy of formation and bond energy both involve the formation of one mole of $H C l$ from the elements.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Heat of Formation or enthalpy of Formation: The amount of heat absorbed or evolved when 1 mole of the substance is directly obtained from its constituent elements in their standard state is called “Heat of formation”.
The energy required to break the bond is termed as bond dissociation
energy. More precisely we can say that the amount of energy required to break one mole of bond of a particular type between the atoms in the gaseous state, i.e., to separate the atoms in the gaesous state
under one atm. pressure and the specified temperature is called bond dissociation energy.
The bond dissociation energy of a diatomic molecule is also called bond energy. However, the bond dissociation energy depends upon the nature of bond and also the molecule in which the bond is present.
As both enthalpy of formation and bond energy involve the formation of one mole of HCl from the elements so they both are same.

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Assertion (A) All collision of reactant molecules lead to product formation.

Reason (R) Only those collisions in which molecules have correct orientation and sufficient kinetic energy lead to compound formation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Q. Assertion :Enthalpy of formation of

H C l

is equal to the bond energy of

H C l

. Reason: Enthalpy of formation and bond energy both involve formation of one mole of

H C l

from the elements.

Assertion (A) The enthalpy of reaction remains constant in the presence of a catalyst.

Reason (R) A catalyst participating in the reaction forms different activated complex and lowers down the activation energy but the difference in enrgy of reactant and product remains the same.

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:

(a)If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b)If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c)If assertion is true but reason is false.

(d)If assertion is false but reason is true.
Assertion : EV(M

^{2 +}

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Assertion (A) Addition reaction of water to but-1-ene in acidic medium yields butan-1-ol.
Reason (R) Addition of water in acidic medium proceeds through the formation of primary carbocation.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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Assertion :Enthalpy of formation of HCl is equal to bond energy of HCl. Because Reason: Enthalpy of formation and bond energy both involve the formation of one mole of HCl from the elements.

Assertion :Enthalpy of formation of $H C l$ is equal to bond energy of $H C l$ . Because Reason: Enthalpy of formation and bond energy both involve the formation of one mole of $H C l$ from the elements.