71. Which of the following element has the lowest electron affinity ?

1. 1. Selenium

   
   
   

   2. Pauling

   
   
   

   3. Bohr

   
   
   

   4. Mulliken

   
   
   

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   NA

   Correct Option: B

   NA

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72. Consider the following statements with reference to the periodic table of chemical element
    1. Ionisation potential gradually decreases along a period
    2. In a group of element, electron affinity decreases as the atomic weight increases
    3. Ina given period, electronegativity decrease as the atomic number increases
    Which of these statement (s) is/are correct ?

1. 1. 1 only

   
   
   

   2. 2 only

   
   
   

   3. 1 and 3

   
   
   

   4. 2 and 3

   
   
   

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   NA

   Correct Option: B

   NA

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73. The screening effect on inner electrons of the nucleus causes

1. 1. Decrease in the ionisation energy

   
   
   

   2. Increase in the ionisation energy

   
   
   

   3. No effect on the ionisation energy

   
   
   

   4. Increase in the attraction of the nucleus to the electrons

   
   
   

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   NA

   Correct Option: C

   NA

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74. Which of the following has the highest ionisation potential

1. 1. N

   
   
   

   2. C

   
   
   

   3. O

   
   
   

   4. F

   
   
   

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   NA

   Correct Option: D

   NA

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