Question:
When copper is heated with conc. $HNO_3$ it produces :
When copper is heated with conc. $HNO_3$ it produces :
Updated On: Mar 27, 2026
- $Cu(NO_3)_2$ and $NO$
- $Cu(NO_3)_2,NO$ and $NO_2 $
- $Cu(NO_3)_2$ and $N_2O$
- $Cu(NO_3)_2$ and $NO_2$
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The Correct Option is D
Solution and Explanation
Reaction of Copper with Concentrated Nitric Acid
When copper reacts with concentrated nitric acid (\( HNO_3 \)), a reddish-brown gas, nitrogen dioxide (\( NO_2 \)), is evolved. The reaction can be represented as:
\(\text{Cu} + 4HNO_3 \rightarrow \text{Cu(NO}_3\text{)}_2 + 2H_2O + 2NO_2\)
Explanation:
- Reddish-Brown Gas (\( NO_2 \)): Nitrogen dioxide is a brown gas produced in this reaction, which is a result of the reduction of nitric acid in the presence of copper.
- Copper Nitrate: Copper forms copper(II) nitrate (\( Cu(NO_3)_2 \)) as one of the products of the reaction.
- Water: Water molecules are also produced as part of the reaction with nitric acid.
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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