IONISATION ENTHALPY€¦ · The first ionization energy of Mg will be 1) Greater than Be 2) Less than Be 3) Less than Al 4) Less than Na 15. Which of the following has highest ? 1)

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IONISATION ENTHALPY

1. As atomic number of elements increases, the I.E value of the elements in a period

1) Decreases 2) increases

3) Remains constant 4) first increases and then decreases

2. Top to bottom in a group the I.E of elements decreases this is due to

1) Decrease in nuclear charge

2) Increase in nuclear charge

3) Decrease in screening effect and Increase in size

4) Increase in size of atom and Increase in screening effect

3. In a given orbit penetrating power is highest for

1) p-electrons 2) s-electrons 3) d-electrons 4) f-electrons

4. For any atom, the order of ionization potential values is

1) I1< I2< I3 <I4 2) I1> I2> I3 <I4 3) I1< I2> I3 <I4 4) I1> I2> I3 >I4

5. The element with highest ionization potential is

1) Argon 2) Cesium 3) Helium 4) Hydrogen

6. Nitrogen has higher than that of oxygen because Nitrogen has

1) half-filled 3p sublevel 2) smaller size

3) less number of valence electrons 4) more number of valence electrons

7. The correct order of values of carbon, nitrogen, oxygen and fluorine is

1) C>N>O>F 2) O>N>F>C 3) O>F>N>C 4) F>O>N>C

8. IE1 of Boron is less than that of Beryllium. This is because

1) B has 1s2 2s2 2p1 configuration 2) B has small atomic size

3) B has higher nuclear charge 4) B has more number of shells

9. The peaks in ionisatoin potential curves are occupied by

1) Alkali metals 2) inert gases 3) transition metals 4) halogens

10. Which group of elements will have lowest ionisation potential in the long form of periodic

table?

1) I A group 2) Zero group 3) VII A group 4) IV A group

11. Element with lowest and highest I.P. values in each period respectively.

1) Alkali metals, Noble gases 2) Alkali metals, Halogens

3) Halogens, Alkali metals 4) Noble gases, Alkali metals



12. The first ionisation potential is maximum for (AIIMS)

1) Lithium 2) Uranium 3) Iron 4) Hydrogen

13. Which of the following transitions involves maximum amount of energy?

1) M– (g) →M (g) 2) M (g) →M+ (g)

3) M+ (g) →M2+ (g) 4) M2+ (g) →M3+ (g)

14. The first ionization energy of Mg will be

1) Greater than Be 2) Less than Be 3) Less than Al 4) Less than Na

15. Which of the following has highest ?

1) Li 2) C 3) Be 4) B

16. the first, second third and fourth ionization potential values of an element are 6.11, 49.21,

62.0, 81.39 eV respectively. Group number of the element is likely

1) IA 2) IIA 3) IVA 4) IVA

17. The I1 values of Li, Be and C are 5.4 eV/atom, 9.32 eV/atom and 11.26 eV/atom. The I1

value of Boron is

1) 13.6 eV/atom 2) 8.29 eV/atom 3) 14.5 eV/atom 4) 21.5 eV/atom

18. The I1 of potassium is 4.339 eV/atom the I1 of sodium

1) 4.339 2) 2.21 3) 5.138 4) 1.002

19. The first ionization potential of four consecutive elements, present in the second period of

the periodic table are 8.3, 11.3, 14.5 and 13.6 eV respectively. Which one of the following is

the first ionization potential (in eV) of nitrogen?

1) 13.6 2) 11.3 3) 8.3 4) 14.5

20. Elements X, Y and Z have atomic numbers 19, 37 and 55 respectively Which of the

following statements are true about them?

1) Their ionization potential would increase with increasing atomic number

2) ‘Y’ would have an ionization potential between those of X and Z

3) Z would have the highest ionization potential

4) Y would have the highest ionization potential



21. Second ionisation potential of oxygen is

1) Equal to that of fluorine 2) Less than that of fluorine

3) Greater than that of fluorine 4) Half of that of fluorine

22. The first four ionization energy values of an element are 191, 578,872, and 5692 kcals. The

numbers of valence electrons in the element are

1) 5 2) 2 3) 3 4) 4

23. An alkaline earth element has the I1, I2 and I3 values 9.2 eV/atom, 18.5 eV/atom and x’

eV/atom then ‘x’ is

1) 3eV/atom 2) 124 eV/atom 3) 20 eV/atom 4) 10 eV/atom

24. Which of the following species has the highest ionization potential?

1) Li+ 2) Mg+2 3) Al+3 4) Ne

25. Among the elements A, B, C and D having atomic numbers 9, 10, 11 and 12 respectively

the correct order of ionization energies is

1) A > B > C > D 2) B > A > D > C 3) B > A > C > D 4) D > C > B > A

KEY

1) 2 2) 4 3) 2 4) 1 5) 3 6) 1 7) 3 8) 1 9) 2 10) 1

11) 1 12) 4 13) 4 14) 2 15) 2 16) 1 17) 2 18) 3 19) 4 20) 2

21) 3 22) 3 23) 2 24) 1 25) 2

IONISATION ENTHALPY€¦ · The first ionization energy of Mg will be 1) Greater than Be 2) Less than Be 3) Less than Al 4) Less than Na 15. Which of the following has highest ? 1)

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