Why is the skin wiped with spirit (alcohol) before pushing an injection ?

Why the farmers dip the seeds in chemicals before sowing?

Explain why the sodium extract is boiled with nitric acid before adding silver nitrate solution for detecting halogens.

Why the boiling point of ethyl alcohol is higher than diethyl ether?

Why are we not able to rotate a wheel by pulling or pushing along its radius?

Why is it essential to wash the precipitate with water before estimating it quantitatively ?

Why is the zinc blende ore roasted before carbon reduction? Answer with balanced chemical equation.

Why is that once a person starts taking alcohol or drugs, it is difficult to get rid of this habit? Discuss it with your teacher.

Explain why it is difficult to open a door by pushing or pulling it near the hinge.

Why it is recommended to have a blood test before marriage?