Number of compounds/species from the following with non-zero dipole moment is ______. $$BeCl_2$$, $$BCl_3$$, $$NF_3$$, $$XeF_4$$, $$CCl_4$$, $$H_2O$$, $$H_2S$$, $$HBr$$, $$CO_2$$, $$H_2$$, $$HCl$$

Count compounds/species with non-zero dipole moment from the given list.

Analysis of each:

- $$BeCl_2$$: Linear, symmetric → $$\mu = 0$$

- $$BCl_3$$: Trigonal planar, symmetric → $$\mu = 0$$

- $$NF_3$$: Trigonal pyramidal (lone pair on N) → $$\mu \neq 0$$

- $$XeF_4$$: Square planar, symmetric → $$\mu = 0$$

- $$CCl_4$$: Tetrahedral, symmetric → $$\mu = 0$$

- $$H_2O$$: Bent → $$\mu \neq 0$$

- $$H_2S$$: Bent → $$\mu \neq 0$$

- $$HBr$$: Diatomic, polar → $$\mu \neq 0$$

- $$CO_2$$: Linear, symmetric → $$\mu = 0$$

- $$H_2$$: Homonuclear diatomic → $$\mu = 0$$

- $$HCl$$: Diatomic, polar → $$\mu \neq 0$$

Non-zero dipole moment: $$NF_3, H_2O, H_2S, HBr, HCl$$ → 5.

The correct answer is 5.