Total number of lone pair of electrons in XeOF4 is

Increasing order of bond length in NO, NO⁺ and NO⁻ is

The d-orbitals involved in sp³d hybridisation is

The strength of bonds by 2s – 2s, 2p – 2p and 2p – 2s overlapping has the order

The correct order of volatility is

The atomic number of Sn is 50. The shape of gaseous SnCl₂ molecule is