Question:

An oxide $X$ in its normal form is almost non- reactive due to very high $X - O$ bond enthalpy. It resists the attack by halogens, hydrogen and most of acids and metals even at elevated temperatures. It is only attacked by $HF$ and $NaOH$. The oxide $X$ is

Updated On: Jul 6, 2022
  • $SiO_{2}$
  • $CO_{2}$
  • $SnO_{2}$
  • $PbO_{2}$
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The Correct Option is A

Solution and Explanation

$SiO_{2}$ is attacked by $HF$ and $NaOH$ but not by chemicals under normal conditions.
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Notes on p -Block Elements

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: