Question
Assertion : First ionization energy for nitrogen is lower than oxygen.
Reason : Across a period effective nuclear charge decreases.
Reason : Across a period effective nuclear charge decreases.
✓
Answer
d
The ionisation energy of $N$ is more than that of $O$ because $N$ has exactly half filled valence $p$ orbital. $_7N$ $1s^2\, 2s^2\,p^3$ $_8O$ $1s^2\, 2s^2\,p^4$
The ionisation energy of $N$ is more than that of $O$ because $N$ has exactly half filled valence $p$ orbital. $_7N$ $1s^2\, 2s^2\,p^3$ $_8O$ $1s^2\, 2s^2\,p^4$
The nuclear charge increases across a period.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Density of a $2.05\, M$ solution of $H_2SO_4$ in water is $1.08\, gm/ml$. Find its Normality and molality
→Calculate the $pH$ at the equivalence point in the titration of $25\ mL$ of $0.01\ M$ formicacid with a $0.1\ M$ $NaOH$ solution (giyenthat $pK_a$ of formic acid $= 3.74$) . $[log\,2 = 0.30]$
→Which one of the following compound will give Saytzeff alkene as a major product in elimination reaction?
One of the products formed due to the reaction between $KMnO_4$ and $HCl$ is
→Major product of the reaction is
In order to prepare $1$ -chloropropane, which of the following reactants can be employed ?
→On electrolysis of aqueous solution of $KI$ in presence of platinum electrodes
$(a)$ Hydrogen gas is released at cathode
$(b)$ Oxygen gas is released at anode
$(c)$ $pOH$ of solution decreases
$(d)$ There is deposition of potassium at cathode
Choose the correct option from following
→$(a)$ Hydrogen gas is released at cathode
$(b)$ Oxygen gas is released at anode
$(c)$ $pOH$ of solution decreases
$(d)$ There is deposition of potassium at cathode
Choose the correct option from following
Elements of which group form anions most readily
Properties common to the elements manganese, iron, cobalt, nickel and copper include the ready formation by them all of
→$(I)$ coloured ions in aqueous solution
$(II)$ oxides of nitrogen are formed on reaction with concentrated $HNO_3$
$(III)$ chlorides of formula $MCl_2$ and $MCl_3$
Boiling point of alcohol is comparatively higher than that corresponding alkane due to