Question:

Which of the following can be oxidised by $SO_2$ ?

Updated On: Aug 1, 2022
  • $K_2Cr_2O_7$
  • $Mg$
  • $H_2O$
  • All of these
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The Correct Option is B

Solution and Explanation

With KCrO, SO works as reducing agent. $ {K2Cr2O7 + H2SO4 + 3SO2 -> K2SO4 + Cr2(SO4)3 + H2O}$ With water the reaction is not a redox reaction, $ {SO2 + H2O -> H2SO3}$ $ {2Mg + SO2 -> 2MgO + S}$ $ {3Mg + SO2 -> 2MgO + MgS}$
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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: