Assertion Nitrogen has higher first ionisation energy than oxygen. Reason Atomic radius of nitrogen is smaller than that of oxygen.

Correct Answer - A N atom has exactly half-filled p-orbitals. Since extra stability is associated with exactly half- filled orbitals, therefore, nitrogen has slightly higher ionization energy than oxygen.

Correct Answer - B Assertion. In group 16, sulphur has the highest electron affinity. Reason. It is due to relatively compact 2p-subshell in which the electron enters in oxygen.

Correct Answer - C In first oxidie, Mass of `2*24` L of nitrogen at STP `=2*8g` `:.` Mass of oxygen `=4*4-2*8=1*6g` In second oxide Mass of `22*4`L of nitrogen at STP...

The atomic radii of the three elements are : N (70 pm), P(110 pm) and As (121 pm). In moving from N to P, there is effective shielding by intervening...

Correct Answer - B Carbon because silicon has larger size.

Correct Answer - B Correct explanation : Nitrogen can not expand its octet due to non-availability of d-orbitals.

Correct Answer - C (c) Correct reason. `Mn^(2+)" "(3d^(5))` has more stable configuration than `Mn^(3+)" "(3d^(4))` while `Fe^(3+)" "(3d^(5))` has more stable configuration than `Fe^(2+)" "(3d^(6))`. Therefore, `E_(Mn^(3+)//Mn^(2+))^(@)` couple is more...

Correct Answer - B The time period in sum position, `T_(s)=2pi sqrt((I_(s))/(M_(s)H))` `where, " "I_(s)+I_(1)+I_(2) and M_(s)=M_(1)+M_(2)` ` " " T_(s)=2pi sqrt((I_(1)+I_(2))/((M_(1)+M_(2))H))` Time period in difference position, ` " " T_(d)=2pi...

Correct Answer - d Correct Assertion. 0.2 M awueous solution of glucose has the same lowering in freezing point temperature then 0.2 M aqueous urea solution. Correct Reason. `K_(f)` is the...

Correct Answer - C The energy rquired to removed electron in the first excited state (n=2) The energy of the photon `Rhc((1)/(1^(2))-(1)/(n^(2)))` `rArr" " 13.6((1)/(4)-(1)/(4))=13.6((4-1)/(4))` `" " =13.6 xx(3)/(4)=(40.8)/(4)=10.2eV`