Why axial bonds of PCI₅ are longer than equatorial bonds?

Give the correct decreasing order C-H bond,lengths in molecule \({ C }_{ 2 }H_{ 6 },{ C }_{ 2 }H_{ 4 }\)  and \({ C }_{ 2 }H_{ 2 }\)

Among the molecules, NO⁺, N₂, SnCl ₂, and   \({ NO }_{ \overline { 2 } }\)  identify the species which is isoelectronic with CO.

Explain why HF is less viscous than H₂O

Explain the following on the basis of valence bond theory.
(a) BF₃ is planer but NH₃ is not.
(b)  CCl₄ and SiCl₄ are tetrahedral.
(c) The HSH bond angle is H₂S is closer to 90⁰ than HOH bond angle in H₂O.

In the following pair of the compound, which one is more covalent and why?
(i) AgCl, AgI
(ii) BeCl₂ , MgCl₂
(iii) SnCl₂ , SnCl₄
(iv) CuO, CuS

What is meant by the term bond order? Calculate the bond order of : N₂, O_2, O_{2 ⁺,} \({ O }_{ 2 }^{ - }\)

Calculate the formal charge on each atoms of Carbonate ion