Give reason for the following case:
The passengers are advised to remove ink from pen while going up in an aeroplane.

Give reason for the following case: It is easier to swim in sea water than in river water.

Give the reason for the following: Phosphorus froms PCl_5 whille nitrogen cannot from NCl_5

Give reasons for the following:- Write the step Involved'ln preparation of Na_2 CrO_4 from chromite ore.

Give reason for the following: On electrolysis in acidic solution, amino acids migrate towards cathode while in alkaline solution these migrate towards anode. ii) The mono amine monocarboxylic acids have two p^K values.

Give reason for the following. It is not necessary to produce amylase in an inactive form in our body, but it is not in the case of Trypsin.

Give reasons for the following elemental phosphorus doesnot exist as P_2 molecule:- While nitrogen exist as N_2 molecule.

There are different type of forces in nature.We learnt their effects and applications.Give the exact reasons for the following. Why are passengers thrown forward when a speeding bus stops suddenly?