Ionization Enthalpy

Q.

What is shielding effect and screening effect?

Q. Why chlorine has most electron affinity and fluorine is most electronegative?

Q.

Energy of an electron in the ground state of the hydrogen atom is –2.18 × ${10}^{–18}$ J. Calculate the ionization enthalpy of atomic hydrogen in terms of J $mo{l}^{–1}$.

Q.

In F-, H-, Cl-, Br- , which has smallest radius? And why...

Q.

Can you help me with all the formulas we are gonna use in Chapter Atomic Structure of class XI Chemistry?

From CBSE level question to the JEE level questions?

ALL FORMULAE!

Q. An element has successive ionization enthalpies as $1^{st}$ (940), 2080, 3090, 4140, 7030, 7870, 16000 and 19500 kJ $mo{l}^{-1}$^. To which group of the periodic table does this element belong?

1. 14
2. 15
3. 16
4. 17

Q. Why there is unusual change in the order of electronegativity of boron family(13 group)?

Q.

The order of first electron affinity of O, S and Se is -

1. O > S > Se

2. Se > O > S

3. S > Se > O

4. S > O > Se

Q. Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R.
$\text{Assertion A:}$The first ionization enthalpy for oxygen is lower than that of nitrogen.
$\text{Reason R:}$ The four electrons in 2p orbitals of oxygen experience more electron-electron repulsion.
In the light of the above statements, choose the correct answer from the options given below.

1. Both A and R are correct but R is NOT the correct explanation of A
2. A is not correct but R is correct
3. A is correct but R is not correct
4. Both A and R are correct and R is the correct explanation of A

Q. 19. OCl-/Cl- and Cl-/1/2Cl2 ke standard potential is 0.94V and1.36V what is the E^° value of OCl-/1/2Cl2 1)2.20V 2)0.42V 3)0.52V 4)0.490V

Q. For the second period elements, the correct increasing order of first ionisation enthalpy is:

1. $Li<Be<B<C<N<O<F<Ne$
2. $Li<B<Be<C<O<N<F<Ne$
3. $Li<B<Be<C<N<O<F<Ne$
4. $Li<Be<B<C<O<N<F<Ne$

Q.

How do you determine the electronic configuration of $"\mathrm{W}"$

Q. What is the correct order of increasing second ionisation energies for the elements $Be,B,C,N$ and $F?$

1. $Be<C<B<N<F$
2. $F<C<B<N<Be$
3. $Be<B<C<N<F$
4. $Be<C<N<B<F$

Q. 10. Calculate half cell potential at 298k for the reaction Zn\pm +2 ===Zn if [Zn]=2M, Enot Zn\pm /Zn = -0.76V

Q. 14. Calculate the no of ions in MOHRs salt [FeSO4. (NH4)2SO4.6H2O]

Q. General electronic configuration for s- block element is

1. $\left[inertgas\right]n{s}^{\text{0-1}}$
2. $\left[inertgas\right]n{s}^{\text{0-2}}$
3. $\left[inertgas\right]n{s}^{\text{1-2}}$
4. All of the above

Q.

Would you expect the first ionization enthalpies for two isotopes of the same element to be the same or different? Justify your answer.

Q.

Why is the second ionization energy higher than first?

Q.

17.4% (w/v) K2SO4 solution at 27°C is isotonic with 5.85% (w/v) NaCl solution at 27°C. If NaCl is 100% ionized, what is the % ionization of K2SO4 in aq. solution?

Q. The ionization energy of sodium is $495kJ/mol$. How much energy is needed to convert atoms present in 2.3 $mg$ of sodium into sodium ions?

1. 4.95 $J$
2. 495 $J$
3. 49.5 $J$
4. 0.495 $J$

Q.

Define ionisation enthalpy. Discuss the factors affecting ionisation enthalpy of the elements and its trends in the periodic table.

Q.

The ratio of the speed of the electron in the ground state of a hydrogen atom to the speed of light is

Q. The incorrect statement among the following:

1. The first ionisation potential of $Al$ is less than the first ionisation potential of $Mg$.
2. The second ionisation potential of $Mg$ is greater than the second ionisation potential of $Na$.
3. The first ionisation potential of $Na$ is less than the first ionisation potential of $Mg$.
4. The third ionisation potential of $Mg$ is greater than third ionisation potential of $Na$.

Q.

Why is the second ionisation energy of Bismuth greater than that of Antimony?

Q.

Name the process of formation of ions from molecules which are not in ionic state;

Q. Why the oxides of nitrogen are purely acidic and that of arsenic and bismuth are basic

Q. The graph of first ionization enthalpy versus atomic number as follows:
Which of the following statement is correct?

1. Alkali metals are at the maxima and noble gases at the minima
2. Noble gases are at the maxima and akali metals at the minima
3. Transition elements are at the maxima
4. Minima and maxima do not show any regular behaviour

Q.

The electronic configuration of the element with atomic number $29$is ?

Q.

The ionization constant of HF, HCOOH and HCN at 298K are 6.8 × 10^–4, 1.8 × 10^–4 and 4.8 × 10^–9 respectively. Calculate the ionization constants of the corresponding conjugate base.

Q. 1 mole of magnesium in the vapour state absorbed 1200 kJ $mo{l}^{-1}$ of energy. If the first and second ionization energies of Mg are 750 and 1450 kJ $mo{l}^{-1}$ respectively, the final composition of the mixture is

1. 31 % Mg⁺ + 69 % Mg²⁺
2. 69 % Mg⁺ + 31% Mg²⁺
3. 86 % Mg⁺ + 14 % Mg²⁺
4. 14 % Mg⁺ + 86 % Mg²⁺