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Which of the following is correct statement :-

Option: 1

\mathrm{AlCl}_3 has expanded octet.


Option: 2

\mathrm{Na}_2 \mathrm{SO}_4 contains only ionic and covalent bonds.


Option: 3

The dipole moment of \mathrm{PCl_{3}} is zero.


Option: 4

In cyanide ion, the negative charge resides on carbon.


Answers (1)

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a) \mathrm{AlCl_{3}} has contraction of octet as it has only 6 surrounding electrons. 

b) The structure of  \mathrm{\mathrm{Na}_2 \mathrm{SO}_4} is as follows.

It has ionic, covalent as well as co-ordinate bond.

c) \mathrm{\mu \neq 0} due to presence of  lone pair.

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Divya Prakash Singh

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