Why Nahasa4 is called and acidic salt and na2so4
Normal salt ? Explain with equation

Na2SO4 is formed by the reaction of strong base NaOH with strong acid H2SO4. It is formed by the complete replacement of ionizable H+ ions of H2SO4. ... As NaHSO4 has one replaceable H+ ion. It can react with base so it is acidic salt.

Explanation:

and Na2SO4 is a neutral salt. It is not an acid or base because on hydrolysis this compound gives sodium hydroxide (strong base)and sulphuric acid(strong acid). ... Since,it is made up of strong acid and strong base , Hence,the PH of salt is 7 or a Neutral salt.

mention the spill to the teacher clean the area and throw the broken pieces away

explanation:

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.