Trend in Ionisation Enthalpy

Q. Following statements regarding the periodic trends of chemical reactivity of the alkali metals and the halogens are given. Which of the following statement is correct?

1. Chemical reactivity increases with increase in atomic number down the group in both the alkali metals and halogens.
2. In alkali metals the reactivity increases but in the halogens it decreases with increase in atomic number down the group.
3. The reactivity decreases in the alkali metals but increases in the halogens with increase in atomic number
4. In both the alkali metals and the halogens, the chemical reactivity decrease with increase in atomic number down the group.

Q. Consider the following statements:

(I) The radius of an anion is larger than that of the parent atom.
(II) The ionization enthalpy generally increases with increasing atomic number in a period.
(III) The electronegativity of an element is the tendency of an isolated atom to attract an electron.

Which of the above statements is/are correct?

1. I and II
2. II alone
3. II and III
4. I alone

Q. Which of the following represent the correct order of increasing $I{E}_1$ for Ca, Ba, S, Se and Ar?
(JEE Advanced, 2013)

1. Ba < Ca < Se < S < Ar
2. Ca < Ba < S < Se < Ar
3. Ca < S < Ba < Se < Ar
4. S < Se < Ca < Ba < Ar

Q.

Correct orders of \(I^{st}\) I.P. are -

(i) Li < B < Be < C

(ii) O < N < F

(iii) Be < N < Ne

1. (ii), (iii)

2. (i), (ii)

3. (i), (iii)

4. (i), (ii), (iii)

Q.

The incorrect statement among the following is

1. The first ionisation potential of Alis 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 third ionisation potential of Mg is greater than the third ionisation potential of Al

4. The first ionisation potential of Na is less than the first ionisation potential of Mg

Q.

In halogens, with the increase of atomic number ...

1. In MX₂ (M=metal and X= halogen), covalent properties decreases

2. Ionization potential decreases

3. Habit to loose electrons decreases

4. Ionic radii decreases

Q.

Which of the following is not the correct increasing order of ionization energy?

1. Au<Ag<Cu

2. K<Ca<Sc

3. Cl^-<Ar<K⁺

4. Cs<Rb<K

Q.

The first ionization energies of alkaline earth metals are higher than those of the alkali metals. This is because ...

1. There is increase in the nuclear charge of the alkaline earth metals

2. There is a decrease in the nuclear charge of the alkaline earth metals

3. There is no change in the nuclear charge

4. None of the above

Q.

What will be the order of $I^{st}$ ionisation energy?

1. Li > Na > K

2. K > Li > Na

3. Na > Li > K

4. Li > K > Na

Q.

The factor not affecting ionisation enthalpy is?

1. Size of atom

2. Charge in the nucleus

3. Type of electron involved

4. Type of bonding in the crystal lattice