Tag: p- block elements-ii

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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

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- 

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

Which one of the following elements is not detected by Lassaigne's test?

  1. Sulphur

  2. Nitrogen

  3. Oxygen

  4. Chlorine
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It is a general test for the detection of halogens, nitrogen and sulphur in an organic compound. These elements are covalently bonded to the organic compounds. In order to detect them, these have to be converted into their ionic forms. This is done by fusing the organic compound with sodium metal.