(B) In $H_2S$,the central atom $S$ is in the $3rd$ period and has a larger atomic size compared to $O$ in $H_2O$. Due to the larger size of $S$,the $S

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(B) In $H_2S$,the central atom $S$ is in the $3rd$ period and has a larger atomic size compared to $O$ in $H_2O$. Due to the larger size of $S$,the $S-H$ bonds are formed by almost pure $p$-orbitals with very little hybridization. Consequently,the bond angle in $H_2S$ is approximately $92^\circ$,which is very close to $90^\circ$.