Tag: group 16 elements - trends in chemical properties

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Multiple choice chemistry p- block elements-ii group 16 elements - general properties group 16 elements - trends in chemical properties group 16 elements

Which of the element is most poisonous to human?

  1. $O$
  2. $S$
  3. $Se$

  4. None of above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The long-term intake of excessive selenium may involve either organic or inorganic forms in food or water. Which affects the human health adversely. So it ispoisonous.

Hence option C is correct. 

Multiple choice chemistry p- block elements-ii group 16 elements - general properties group 16 elements - trends in chemical properties group 16 elements

The properties like ionization potential, electronegativity, electron affinity and power of the catenation of the member in a group depend on many factors. For example, the smaller the size of the atom greater will be the ionization potential. At the same time symmetry in the electronic configuration of the elements also play a part in their ionization energy. Smaller the atomic size, greater will be the mutual electronic repulsion and lesser will be electron affinity. Similarly, the catenation which is a direct result of M - M bond strength is also affected by similar considerations.

The correct decreasing order of catenation among group $16$ elements is _________.

  1. $O > S > Se > Te$
  2. $S > O > Se > Te$
  3. $S > Se > Te > O$
  4. $S > Se > O > Te$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Power of self-catenation generally depends on bond strength (of M - M bond), so the decreasing order of catenation is :


                                  $S$               >                      $Se$           >          $ O$            >                $ Te$
Bond energy               226                                  172                       142                       126
($ kJ mol^{-1}$) 

The bond energy values generally decrease down the group But because of the very small size and consequent mutual inter electronic repulsion oxygen has lower bond energy than $S$ and $Se.$ Due to the large size, $Te - Te$ bond is the weakest.

Therefore, the correct decreasing order of catenation is-