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Class 11 Chemistry (Part I) Chapter 3 Classification Of Elements And Periodicity In Properties Quiz 2 (25 MCQs)

Quiz Instructions

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1. The outermost electronic configuration for iodine is

Correct Answer: C) [Kr]5s2 5p5.

2. Element is called as Rouge element

Correct Answer: C) Hydrogen.

3. Question 33. In the modern periodic table, the period indicates the value of

Correct Answer: C) Principal quantum numbe.

4. Which of the following sets has strongest tendency to form anions?

Correct Answer: C) N, O, F.

5. Second group elements are called as

Correct Answer: B) Alkaline earth metal.

6. The number of elements in each of the inner transition series is .....

Correct Answer: D) 14.

7. The ionisation enthalpy of Beryllium is greater than Boron because

Correct Answer: B) Completely filled electronic configuration of Be.

8. In the modern periodic table, which one of the following does not have appropriate positions?

Correct Answer: C) Inner transition elements.

9. Which element has highest electron gain enthalpy

Correct Answer: A) Chlorine.

10. The elements of group 17 are called

Correct Answer: B) Halogens.

11. Consider the following species:N3-, O2-, F-, Na+, Mg2+and Al3+(b) Arrange them in the order of increasing ionic radii.

Correct Answer: B) Al3+ < Mg2+ < Na+ < F-< O2-< N3-.

12. Law of Triads was referred to as ..... relationship.

Correct Answer: D) Dobereiner's.

13. Eka-aluminium and Eka-silicon are known as

Correct Answer: A) Gallium and germanium.

14. The magic number indicates .....

Correct Answer: A) 2 8 8 18 18 32.

15. Which one of the following statements is incorrect in relation to ionization enthalpy?

Correct Answer: D) Removal of electron from orbitals bearing lower n value is easier than from orbital having higher n value.

16. The correct order for the size of I, I+, I-is

Correct Answer: C) I-> I > I+.

17. The ionic radius of fluoride ion is 136pm while the atomic radius is 64pm . Why

Correct Answer: D) Effective nuclear charge per electron decreases.

18. In 1800 how many elements were known?

Correct Answer: B) 31.

19. The size of isoelectronic species-F-, Ne and Na+ is affected by

Correct Answer: A) Nuclear charge (Z ).

20. Considering the elements B, C, N, F, and Si, the correct order of their non-metallic character is:

Correct Answer: C) F > N > C > B > Si.

21. Among the elements from atomic number 1 to 56, the number of elemenets which havean unpaired electron in the s-subshell is

Correct Answer: C) 6.

22. Who discuss the properties of elements by plotting a graph between frequency of X-Ray and atomic number of each element

Correct Answer: C) Henry Moseley.

23. Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuratiuon of gadolinium?

Correct Answer: B) [Xe] 4f$^{7}$ 5d$^{1}$ 6s$^{2}$.

24. Pick out the correct statement regarding Law of Octaves.

Correct Answer: C) Newlands's Law of Octaves seemed to be true only for elements up to calcium.

25. Considering the elements B, Al, Mg, and K, the correct order of their metalliccharacter is:

Correct Answer: C) K > Mg > Al > B.

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