Assignment No – 1 Classification of Elements and Periodicity in Properties | Class 11th

Assignment No – 1

Classification of Elements and Periodicity in Properties

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Q1. The correct order of second ionization potential of carbon, nitrogen, oxygen and fluorine is 

a) C > N > O > F                                                       b) O > N > F > C                  

c) O > F > N > C                                                        d) F > O > N > C

 

Q2. The first ionization potential of Na, Mg, Al and Si are in the order

a) Na < Mg > Al < Si                                                 b) Na > Mg > Al > Si                        

c) Na < Mg > Al < Si                                                 d) Na > Mg > Al > Si

 

Q3. Which electronic configuration of an element has abnormally high difference between second and third ionization energy

a) 1s² 2s² 2p⁶ 3s¹                    b) 1s² 2s² 2p⁶ 3s² 3p¹          c) 1s² 2s² 2p⁶           d) 1s² 2s² 2p⁶ 3s²

 

Q4. The set representing the correct order of ionic radius is

(a) Li⁺² > Be⁺² > Na⁺² > Mg⁺²                                               (b) Na⁺² > Li⁺² > Mg⁺² > Be⁺²

(c) Li⁺² > Na⁺² > Mg⁺² > Be⁺²                                                         (d) Mg⁺² > Be⁺² > Li⁺² > Na⁺²

 

Que 5. Atomic radii of fluorine and neon in Angstrom units are respectively given by

(a) 0.72, 1.60                                      (b) 1.60, 1.60

(c) 0.72, 0.72                                       (d) None of these

 

Que 6. Which one of the following is the smallest in size?

(a) N^3-                         (b) O^2-                                     (c) F^-               (d) Na⁺

 

Que 7. The correct order of atomic radii is

(a) N < Be < B                                                            (b) F^- < O^2- < N^3-       

(c) Na < Li < K                                                          (d) Fe³⁺ < Fe²⁺ < Fe⁴⁺

 

Que 8. The correct sequence which shows decreasing order of the ionic radii of the elements is:

(a) Na⁺ > F^- > Mg²⁺ > O^2- > Al³⁺                             (b) O^2- > F^- > Na⁺ > Mg²⁺ > Al³⁺

(c) Al³⁺ > Mg²⁺ > Na⁺ > F^- > O^2-                             (d) Na⁺ > Mg²⁺ > Al³⁺ > O^2- > F^-

 

Que 9. Among the elements Ca, Mg, P and Cl, the order of increasing atomic radii is:

(a) Ca < Mg < P < Cl                                                (b) Mg < Ca < Cl < P

(c) Cl < P < Mg < Ca                                                 (d) P < Cl < Ca < Mg

 

Que 10. The element with the highest first ionization potential is

(a) Boron                                (b) Carbon

(c) Nitrogen                           (d) Oxygen

 

Que 11. Which of the following has the maximum number of unpaired electrons? 2+ 3+ 3+ 2+

(a) Mg²⁺                                  (b) Ti³⁺                                   (c) V³⁺                         (d) Fe²⁺

 

Que 12. The incorrect statement among the following is

(a) The first ionization potential of Al is less than the first ionization potential of Mg

(b) The second ionization potential of Mg is greater than the second ionization potential of Na

(c) The first ionization potential of Na is less than the first ionization potential of Mg

(d) The third ionization potential of Mg is greater than third ionization potential of Na

 

Que 13. Ionisation energies of the following elements increases in the order

(a) N < O < P < S                               (b) O < N < S < P

(c) P < S < N < O                               (d) S < P < O < N

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