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
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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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:
- Group 13 Elements: Boron family
- Group 14 Elements: Carbon family
- Group 15 Elements: Nitrogen family
- Group 16 Elements: Oxygen family
- Group 17 Elements: Fluorine family
- Group 18 Elements: Neon family