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Class 11 Chemistry (Part I) Chapter 3 Classification Of Elements And Periodicity In Properties Quiz 5 (25 MCQs)

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1. The name of the element with atomic number 120

Correct Answer: D) Unbinilium.

2. The atomic mass of Sr as predicted according to the Dobereiner's law of triads in the triad Ca(Z=40), Sr, Ba(Z=137)is .....

Correct Answer: B) 88.

3. An element 'M' has atomic number 9 and mass number 19 respectively.Its ion will be represented by:

Correct Answer: C) M$^{-1}$.

4. Which pair of atomic numbers represents s-block elements?

Correct Answer: D) 4, 12.

5. The highly metallic element will have the configuration of

Correct Answer: C) 2, 8, 8, 1.

6. Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?

Correct Answer: C) Nuclear mass.

7. The most electronegative element is

Correct Answer: D) Flourine.

8. The atomic number of cerium (Ce) is 58. The correct electronic configuration of Ce$^{3+}$ ion is

Correct Answer: A) [Xe] 4f$^{1}$.

9. Which Medal is given by the royal society of London to newlands in 1887?

Correct Answer: B) Davy Medal.

10. Modern periodic law is based on .....

Correct Answer: A) No. of protons.

11. Which of the following sets represent a collection of isoelectronic species?( At. nos. Cs=55, Br=35 )

Correct Answer: C) N$^{3-}$, F$^{-}$, Na$^{+}$.

12. Which Oxide of nitrogen is known as laughing gas?

Correct Answer: C) N2O.

13. Modern periodic table has ..... periods

Correct Answer: B) 7.

14. Representative elements

Correct Answer: A) S & p block.

15. What Indicates eka-Aluminium and eka-Silicon (Note eka means next)

Correct Answer: A) Gallium and Germanium.

16. Predict the formula of the compound formed with Si and Br

Correct Answer: B) SiBr4.

17. The electronegativity value of fluorine is

Correct Answer: D) 4.

18. Which element have lowest ionization enthalpy?

Correct Answer: A) Caesium.

19. Anything that influences the valence electrons will affect the chemistry of the element" . Which of the factors given below is not affecting the valence shell?

Correct Answer: B) Nuclear mass.

20. The diagonal relationship of Li & Mg is due to

Correct Answer: B) Similarity in atomic size.

21. Noble gases were included in Mendeleev's periodic table in the

Correct Answer: D) None of these.

22. The enthalpy change accompanied by the addition of an electron to neutral gaseous atom to form a negative ion is called .....

Correct Answer: B) Electron gain enthalpy.

23. The general outer electronic configuration of transition metal is

Correct Answer: D) Ns$^{0-2}$ (n-1)d$^{1-10}$.

24. The first synthetic element is .....

Correct Answer: B) Technetium.

25. Which of following has largest size

Correct Answer: C) O$^{2-}$.

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