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Class 11 Chemistry (Part I) Chapter 3 Classification Of Elements And Periodicity In Properties Quiz 4 (25 MCQs)

Quiz Instructions

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1. The fluorine have less negative value of electron gain enthalpy than chlorine because

Correct Answer: C) Fluorine have inter electronic repulsion due to small size.

2. Mendeleev's predictions for the elements Eka-aluminium and Eka-silicon were discovered later as ..... and ..... respectively.

Correct Answer: C) Gallium; germanium.

3. For the same value of n, the penetration power of orbital follows the order

Correct Answer: C) F < d < p < s.

4. WHICH OF THE FOLLOWING HAS MOST NEGATIVE ELECTRON GAIN ENTHALPY

Correct Answer: C) Cl.

5. The most widely used scale for measuring electronegativity

Correct Answer: C) Linus Pauling scale.

6. According to modern periodic law the physical & chemical properties of elements are periodic function of their .....

Correct Answer: A) Atomic number.

7. Element with valence shell electronic configuration as (n-1)d$^{5}$ ns$^{1}$ is placed in which of the following group and block of elements?

Correct Answer: D) 6, d-block.

8. Which of the following oxide is the most basic oxide?

Correct Answer: A) NaO.

9. Who arranged the elements by increasing atomic number?

Correct Answer: D) Henry Moseley.

10. Which of the following will have the most negative electron gain enthalpy

Correct Answer: B) Cl.

11. Of the following pairs, the one containing examples of metalloid elements in the periodic table is

Correct Answer: D) Si and Ge.

12. The correct order of the 1st ionization enthalpy among following elements Be, B, C, N, O, is

Correct Answer: A) B < Be < C < O < N.

13. 17th Group elements have most negative value of electron gain enthalpy because

Correct Answer: C) They have ns2 np5 electronic configuration due to which they need only one electron to acquire noble gas configuration.

14. IUPAC indicates .....

Correct Answer: B) International union of pure and applied chemistry.

15. In the modern periodic table, the period indicates the value of:

Correct Answer: C) Principal quantum number.

16. Which element has highest ionisation enthalpy

Correct Answer: A) Li.

17. The atoms of elements belonging to the same group of periodic table have the same

Correct Answer: D) Number of electrons in the outermost shell.

18. The anomalous behavior of first element in each group is due to

Correct Answer: D) All of these.

19. Which of the following atoms has the highest electronegativity?

Correct Answer: C) O.

20. Cl has high electron gain enthalpy than F

Correct Answer: A) Small size of 2p orbital of F.

21. In the following the element with the highest ionization energy is

Correct Answer: B) [Ne] 3s$^{2 }$3p$^{3}$.

22. According to mendeleev the horizontal rows are called as ..... and vertical columns are called as .....

Correct Answer: B) Series and Group.

23. The compound formed by the combination of silicon and chlorine will be

Correct Answer: B) SiCl4.

24. The atomic size down the group ..... and Ionization enthalpy along the period .....

Correct Answer: C) Increases & increases.

25. IUPCC name of element with atomic number 115 will be

Correct Answer: B) Ununpentium.

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