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# Which one of the following is a correct set?

$\begin {array} {1 1} (1)\;H_2O,sp^3, angular & \quad (2)\;BCl_3,sp^3,angular \\ (3)\;NH_4^+,dsp^2,square\;planar & \quad (4)\;CH_4,dsp^2,tetrahedral \end {array}$

Can you answer this question?