Assertion. First ionization energy for nitrogen is lower than that of oxygen.

(D) Helium or nitrogen To prevent rancidification of foods containing fats and oils, the packed food is surrounded by unreactive gas (like helium, nitrogen, etc.). The inert atmosphere thus created prevents...

(c) Assertion is correct, reason is incorrect 

Gay lussac’s law of gaseous volume is being obeyed. According to gay lussac’s law of gaseous volumes, gases combine or are produced in a chemical reaction in a simple ration...

The electronic configurations of Na and Mg are: Na:1s2 2s2 2p6 3s1 And Mg: 1s2 2s2 2p6 3s2 thus, the first electron in both the cases has to be removed...

Ka x Kb =Kw  Kb= Kw/Ka  =1 x10-14/1.8x10-8  =5.55x10-7

 Cl - ion Conjugate base H3O+ ion Conjugate base,

(b) Correct explanation: in Al, 3p electron is to be removed while in Mg, a 3s electron is to be removed .

(c)Correct explanation: 2p orbital has higher energy than 2s orbital .

(B)If both assertion and reason are true, but reason is not the true explanation of the assertion.