Q.

Which one of the following has the highest electronegativity

1. Si

2. Cl

3. P

4. Br

Q.

Which element has maximum electron affinity

1. Na

2. S

3. Mg

4. Al

Q. why nitrogen has higher ionisation potential than oxygen?

Q. The correct order of electron gain enthalpy (from most to least endothermic) is:

1. $Be>C>B>N$
2. $Be>N>B>C$
3. $N>Be>C>B$
4. $N>C>B>Be$

Q. Match the increasing orders given in column I with the property(ies) given in column II.

Column I	Column II
(A) $N{a}^{+}<F^{-}<O^{2-}<N^{3-}$	(p) electronegativity
(B) $L{i}^{+}$ < $N{a}^{+}$ < $K^{+}$ < $R{b}^{+}$ < $C{s}^{+}$	(q) Ionisation energy
(C) $O<S<F<Cl$	(r) Size
(D) $C{l}^{-}<K^{+}<C{a}^{2+}<S{c}^{3+}$	(s) Electron affinity

1. (A-r) ; (B-r) ; (C-s) ; (D-p, q, s)
2. (A-r) ; (B-r) ; (C-s) ; (D-p, q, s)
3. (A-r) ; (B-r) ; (C-s) ; (D-p, q, s)
4. (A-r) ; (B-q) ; (C-s) ; (D-p, q, s)

Q. Set represent the correct order of second ionization potential is K>Ca>Ba Ca>Ba>K Ba>K >Ca K>Ba>Ca

Q. What is the value of Electron gain enthalpy of $N{a}^{+}$, if $I{E}_1$ of $Na=5.1eV$ .

1. $10.2eV$
2. $-10.2eV$
3. $-5.1eV$
4. $5.1eV$

Q.

Among the chalcogens, the one having the highest electron affinity is:

1. Oxygen

2. Sulphur

3. Selenium

4. Polonium

Q. does the nature of an electrophile wi electronegative nature of an radioactive element affect the properties or electronegativity of another electrophile of higher electronegativity

Q. How to calculate 2nd ionization energy for 3 rd period

Q. Why is the electron gain enthalpy of fluorine less than chlorine?

Q. Which element has highest positive value of electron gain enthalpy?

Q. Which of the following trend is/are correct?

1. $Cl{O}_2>S{O}_2>C{O}_2>P_2{O}_5\text{(acidic nature)}$
2. $Na>Si>Al>Mg\text{(second I. P.)}$
3. $S>Se>Te>O\text{(electron affinity)}$
4. $H_{3}P{O}_2>H_{3}P{O}_3>H_{3}P{O}_4\left(K{a}_1\right)$

Q. Trend of electron affinity in period 2 of periodic table with explanation

Q.

What is decreasing order of electron gain enthalpy of N, P, As, Sb, Bi?

Q. Fluorine is more electronegative than Chlorine , but electron gain enthalpy of Chlorine is more than Fluorine . EXPLAIN