Question:

A black powder when heated with cone. $HCl$ gives a greenish yellow gas. The gas acts as an oxidising and a bleaching agent. When it is passed over slaked lime, a white powder is formed which is a ready source of gas. The black powder and white powder respectively are

Updated On: Jul 5, 2022
  • $KCIO_3$ and $NaClO_3$
  • $MnO_2$ and $Ca(OCl)_2$
  • $MnO_2$ and $KClO_3$
  • $MnCl_4$ and $COCl_2$
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The Correct Option is B

Solution and Explanation

$\underset{\text{Black powder}}{ {MnO2}}+$ $\underset{\text{(conc.)}}{ {4HCl}}$$ {-> MnCl2 +2H2O +}$ $\underset{\text{Greenish yellow gas}}{ {Cl2}}$ $ {Cl2 +H2O \to 2HCl +[O]}$ Coloured matter $ {+[O] ->}$ Colourless matter $\underset{\text{Slaked lime}}{ {2Ca(OH)2}}+ {2Cl2 ->}$ $\underset{\text{Bleaching powder (white)}}{ {Ca(OCl)2}}+$ $ {CaCl2 +2H2O}$
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Top Questions on p -Block Elements

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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: