Predict the correct order among the following:

Important Questions on Chemical Bonding and Molecular Structure

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Chemical Bonding and Molecular Structure>AIPMT - 3rd May 2015>Q 29

Which of the following species contains equal number of $\mathrm{\sigma }$ - and $\mathrm{\pi }$ - bonds?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Chemical Bonding and Molecular Structure>AIPMT - 3rd May 2015>Q 30

Which of the following options represents the correct bond order?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Chemical Bonding and Molecular Structure>AIPMT - 3rd May 2015>Q 31

Maximum bond angle at nitrogen is present in which of the following?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Chemical Bonding and Molecular Structure>AIPMT - 3rd May 2015>Q 32

The correct bond order in the following species is:

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Chemical Bonding and Molecular Structure>AIPMT - 3rd May 2015>Q 33

The total number of $\mathrm{\pi }$ -bond electrons in the following structure is:

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Chemical Bonding and Molecular Structure>AIPMT - 25th July 2015>Q 34

The formation of the oxide ion, ${\mathrm{O}}^{2-}\left(\mathrm{g}\right)$ , from oxygen atom requires first an exothermic and then an endothermic step as shown in below:

$\mathrm{O}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}⟶{\mathrm{O}}^{-}\left(\mathrm{g}\right)\mathrm{ }\mathrm{ }\mathrm{ };\mathrm{ }\mathrm{ }{\mathrm{\Delta }}_{\mathrm{f}}{\mathrm{H}}^{\ominus }=-141\mathrm{ }\mathrm{k}\mathrm{J}\mathrm{ }\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$

${\mathrm{O}}^{-}\left(\mathrm{g}\right)+{\mathrm{e}}^{-}⟶{\mathrm{O}}^{2-}\mathrm{ }\left(\mathrm{g}\right)\mathrm{ };\mathrm{ }\mathrm{ }{\mathrm{\Delta }}_{\mathrm{f}}{\mathrm{H}}^{\ominus }=+780\mathrm{ }\mathrm{k}\mathrm{J}\mathrm{ }\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$

Thus process of formation of ${\mathrm{O}}^{2-}$ in gas phase is unfavourable though ${\mathrm{O}}^{2-}$ is isoelectronic with neon. It is due to the fact that,

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Chemical Bonding and Molecular Structure>AIPMT - 25th July 2015>Q 35

Decreasing order of stability of ${\mathrm{O}}_2,\mathrm{ }{\mathrm{O}}_2^{-},\mathrm{ }{\mathrm{O}}_2^{+}$ and ${\mathrm{O}}_2^{2-}$ is:

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 4 - Chemical Bonding and Molecular Structure>AIPMT - 25th July 2015>Q 36

The variation of the boiling points of the hydrogen halides is in the order $\mathrm{H}\mathrm{F}>\mathrm{H}\mathrm{I}>\mathrm{H}\mathrm{B}\mathrm{r}>\mathrm{H}\mathrm{C}\mathrm{l}$ . Which of the following option explains the higher boiling point of hydrogen fluoride?