MCQ
Which of the following is the correct order for increasing bond angle ?
- A$NH_3 < PH_3 < AsH_3 < SbH_3$
- B$H_2O < OF_2 < Cl_2O$
- C$H_3Te^+ < H_3Se^+ < H_3S^+ < H_3O^+$
- D$BF_3 < BCl_3 < BBr_3 < BI_3$
$(b)\, OF_2 < OH_2 < OCl_2$
$(c)\, H_3Te^+ < H_3Se^+ < H_3S^+ < H_3O^+$
$(d)\, BF_3 = BCl_3 = BBr_3 = BI_3$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

$(A)$ Line emission spectra are used to study the electronic structure
$(B)$ The emission spectra of atoms in the gas phase show a continuous spread of wavelength from red to violet
$(C)$ An absorption spectrum is like the photographic negative of an emission spectrum
$(D)$ The element helium was discovered in the sun by spectroscopic method