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Which of the following species contains ...

Which of the following species contains three bond pairs and one lone pair around the central atom?

A

`H_2O`

B

`BF_3`

C

`NH_2^-`

D

`PCl_3`

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  11. The correct order of ionisation energy of C,N,O and F is

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  13. Which of the following have the largest ionic size?

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