“Nitrogen can create `NCI_3` but phosphorous can create both `PCI_3` and `PCl_5`" — why?

Nitrogen produces only NCl_(3) but phosphorus produces both PCl_(3) and PCl_(5) . Give reasons.

Maximum genetic variation can be created through

CH_3 Br can be prepared by

Explain why NCI_3 gets hydrolysed but not NF_3 .

Why is red phosphorous used in the reaction between HI and CH_3 OH during the preparation of methane ?

Energy can be created and be destroyed. State whether this is true or false.

1 mol PCl_(2)(g) is heated in a closed container of 2 litre capacity. If at equilibrium, the quantity of PCl_(5)(g) be 0.2 mol then calculate the value of equilibrium constant for the given reaction, PCl_(5)(g)hArr PCl_(3)(g)+Cl_(2)(g) .

A can hit a target in 3 out of 4 shots and B can hit the target in 4 out of 5 shots. What is the probability of hitting the target ?