Question:

$SiF_6^{2-}$ is known but $SiCl_6^{2-}$ is not. Size of fluorine is small and its lone pair of electrons interacts with d-orbitals of $Si$ strongly.

Updated On: Jul 28, 2022
  • If both assertion and reason are true and reason is the correct explanation of assertion
  • If both assertion and reason are true but reason is not the correct explanation of assertion
  • If assertion is true but reason is false
  • If both assertion and reason are false
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The Correct Option is A

Solution and Explanation

Both assertion and reason are true and reason is the correct explanation of assertion. $SiF _{6}^{2-}$ is known, as $F$ has small size and thus, the ion is quite stable unlike $SiCl _{6}^{2-}$ in which size of $Cl$ atom is large which destabilise it.
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Concepts Used:

P-Block Elements

  • P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
  • P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.

P block elements consist of: