Trend in Electron Affinity

Q.

The electron affinities of halogens are F=322, Cl=349, Br=324, I=295$kJmo{l}^{-1}$. The higher value for Cl as compared to that of F is due to

1. More vacant P - subshell in Cl

2. Higher atomic radius of F

3. Smaller electronegativity of F

4. Weaker electron-electron repulsion in Cl

Q.

Noble gases have the _____ electron affinity.

Q. Chemical reactivity is maximum for elements from group 1 and group 17.

1. True

2. False

Q.

Which of the following configuration will have least electron affinity -

1. ns2np5

2. ns2np2

3. ns2np4

4. ns2np3

Q. In HCl molecule, expected value of dipole moment is 6.12 D but experimental value is 1.03 D. Then, the percentage ionic character will be Options: a) 16.83 b) 15.14 c) 6.02 d) 18.90

Q.

Which one of the following represents a wrong set of quantum numbers for an electron in an atom? (arranged as n, l, m, and s)

1. 3, 3, 3, ±1/2

2. 5, 4, - 3, +1/2

3. 2, 1, -1, -1/2

4. 1, 0, 0, ±1/2

Q.

Which of the following have high electron affinity?

1. F

2. Cl

3. N

4. O

Q. The number of mole of electron(s) exchanged when one mole of Mohr’s salt is oxidised in acidic KMnO4 solution is (1) 1 (2) 2 (3) 3 (4) 4

Q.

The electron affinity values for the halogens shown the following trend -

1. F < Cl > Br > I

2. F < Cl < Br < I

3. F > Cl > Br > I

4. F < Cl > Br < I

Q. 23. Why H+ ion combine with water to give hydronium ion?

Q.

In which of the following arrangements, the order is NOT according to the property indicated against it?

1. Li < Na < K < Rb : Increasing metallic radius

2. KBr < F < Cl: Increasing electron gain enthalpy (with negative sign)

3. B < C < N < O Increasing first ionization

4. ​ < < < Increasing ionic size

   
   

Q.

Which of the following set has the strongest tendency to form anions

1. Ga, In and Te

2. Na, Mg and Al

3. N, O and F

4. V, Cr and Mn

Q. The first ionization enthalpy values ( in kJ mol${}^{-1}$ ) of group 13 element are :

Q. 22. On which carbon electron density is maximum in pyrole and how ?

Q.

Which of the following set has the strongest tendency to form anions

1. Na, Mg and Al

2. N, O and F

3. Ga, In and Te

4. V, Cr and Mn

Q. 24. What are the possible quantum numbers of 3 p-electrons?

Q. Element having both first and second positive electron gain enthalpies is

1. $O$
2. $Na$
3. $N$
4. $F$

Q. if isotop distribution of C^{12} and C^{14 } is 98.0% and 2.0% respectively, then the number of C^{14 }atom in 12cof carbon is

Q. How much energy is required to ionise H atom if the electron occupies n = 5 orbits? Compare your answer with the ionization enthalpy of H atom

Q. Why do other elements of group 15 except nitrogen can exhibit covalency of six , not five ??

Q. "Sodium is more reactive than potassium."
Answer whether the above statement is true or false.
If true enter 1, else enter 0.

Q. 16. In the Boron family, the electropositivity increases up to Aluminium then decreases. Are Ga, In and Tl supposed to form covalent compounds or ionic compounds?

Q. Statement 1: Lithium is the most active metal in the first group of the Periodic Table.
Statement 2: Lithium has only one electron in the outer energy level.

1. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

2. Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

3. Statement 1 is correct but Statement 2 is not correct.

4. Statement 1 is not correct but Statement 2 is correct.

5. Both the Statement 1 and Statement 2 are not correct.

Q.

how many ions each of Na+ and Cl- are present in 12.0 g of NaCl

Q. 82. Hydrogen has only one orbit so how does electron move from ground state to excited state?

Q. Energy of an electron in the ground state of the hydrogen atom is $-2.18\times {10}^{-18}J$. Calculate the ionization enthalpy of atomic hydrogen in terms of J mol${}^{-1}$.

Q. Considering the elements $F,Cl,OandS,$ the correct order of their electron affinity values is:

1. $F>Cl>O>S$
2. $F>O>Cl>S$
3. $Cl>F>S>O$
4. $O>F>S>Cl$

Q.

The electron affinity of Be is almost similar to that of -

1. Li

2. B

3. Na

4. Ne

Q.

why lone pairs have greater repulsion ?

Q. Considering the elements $F,Cl,OandS,$ the correct order of their electron affinity values is:

1. $F>Cl>O>S$
2. $F>O>Cl>S$
3. $Cl>F>S>O$
4. $O>F>S>Cl$