Alpha Question Bank for Medical: Chemistry>Chapter 13 - Chemical Bonding and Molecular Structure>Exercise 5>Q 44

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The shapes of methane, ethene and ethyne molecules are respectively_______.

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Important Questions on Chemical Bonding and Molecular Structure

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Alpha Question Bank for Medical: Chemistry>Chapter 13 - Chemical Bonding and Molecular Structure>Exercise 5>Q 45

The formation of the oxide ion,

O^{2 -} (g)

, from oxygen atom requires first an exothermic and then an endothermic step as shown in below:

O (g) + e^{-} ⟶ O^{-} (g); Δ_{f} H^{⊖} = - 141 k J m o l^{- 1}

O^{-} (g) + e^{-} ⟶ O^{2 -} (g); Δ_{f} H^{⊖} = + 780 k J m o l^{- 1}

Thus process of formation of

O^{2 -}

in gas phase is unfavourable though

O^{2 -}

is isoelectronic with neon. It is due to the fact that,