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Periodic Properties

If we conside...

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If we consider H2/Cl2 molecule is its heat of atomization and bond dissociation energy the same ? reaction is same for atomization and bond dissociation : H2 (g) → 2H (g)

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Q. Bond dissociation energy of

C H_{3} - H

103 k c a l m o l^{- 1}

and heat of formation of

C H_{4} (g)

- 17.88 k c a l m o l^{- 1} .

The dissociation energy of

H_{2} (g)

H

103 k c a l / m o l .

The heat of formation of methyl radical is ?

Q. Assertion :Bond dissociation energy of

F_{2}

molecule is less than that of

C l_{2}

molecule. Reason: Due to inter-electronic repulsion between F atom ,F---F bond length in

F_{2}

molecule is higher than Cl--Cl bond length in

C l_{2}

Read the above assertion and reason and choose the correct option regarding it.

Q. Assertion :Bond dissociation energy of B—F bond in

B F_{3}

molecule is lower than C bond in

C F_{4}

molecule. Reason: Atomic size of B-atom is larger than that of C-atom.

Q. The bond dissociation energy of gaseous

H_{2}, C l_{2}

H C l

are 104, 58 and 103

k c a l . m o l^{- 1}

respectively. The enthalpy of formation for HCl gas will be:

Q. The bond dissociation energy of gaseous

H_{2}

C l_{2}

H C l

104

58

103

m o l^{- 1}

respectively. The enthalpy formation for

H C l

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