Question:

A black compound of manganese reacts with a halogen acid to give greenish yellow gas. When excess of this gas reacts with $NH_3$ an unstable trihalide is formed. In this process the oxidation state of nitrogen changes from

Updated On: Jul 5, 2022
  • $- 3$ to $+3$
  • $- 3$ to $0$
  • $- 3$ to $+5$
  • $0$ to $-3$
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The Correct Option is A

Solution and Explanation

$\underset{\text{(black)}}{ {MnO2}}\,+ {4HCl -> MnCl2 +}$$\underset{\text{(greenish yellow gas)}}{ {Cl2 ^}}+ {2H2O}$ $\overset{(-3)}{N}H_3\,+$$\underset{\text{(excess)}}{ {3Cl2->}}$$\overset{+3}{N}Cl_3 +3HCl$
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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: