Use molecular orbital theory to explain why the `Be_2` molecule does not exist.

Why He_2 molecule is not stable ?

The wave theory of light does not explain

The molecular orbital configuration of a diatomic molecule is sigma 1s^(2) sigma^(**)1s^(2)sigma2s^(2)sigma^(**)2s^(2) sigma2p_(x)^(2)pi2p_(y)^(2)pi2p_(z)^(2) Its bond order is _________.

Use your brain power! Can you tell : Explain why does the lime water turns milky in the reaction of acetic acid with sodium carbonate.

Answer the following questions With a neat labelled diagram, explain twinkling of a star . Also explain why a planet does not twinkle.

Answer the following questions: Explain : Force always occur in pairs or an isolated single force does not exist in the universe.

Answer the following question in short : Explain why the repulsion is used as a test for identifying an electrically charged object ?

Why is O_2 molecule paramagnetic ?

Why does the wave theory of light fail to explain the photoelectric effect.

Explain surface tension on the basis of the molecular theory.