In the detection of II group acid radical, the salt containing chloride is treated with concentrated sulphuric acid, the colourless gas is liberated. The name of the gas is
- Hydrogen chloride gas
- Chlorine gas
- Sulphur dioxide gas
- Hydrogen gas
The Correct Option is A
Solution and Explanation
To solve this question, we need to identify the gas that is liberated when a salt containing chloride is treated with concentrated sulfuric acid. Let's examine the reaction:
When a chloride salt (e.g., NaCl) is treated with concentrated sulfuric acid (H2SO4), the following reaction occurs:
\(\text{NaCl (s) + H}_2\text{SO}_4\text{ (l) } \rightarrow \text{NaHSO}_4\text{ (s) + HCl (g)}\)
In this reaction, hydrogen chloride gas (HCl) is liberated, which is a colorless gas. This accurately matches the description in the question.
Let's examine the incorrect options:
- Chlorine gas: Chlorine gas is a greenish-yellow gas, not colorless, and is typically produced in other chemical reactions, such as when HCl is oxidized.
- Sulphur dioxide gas: This gas is generally produced in reactions involving the complete reduction of H2SO4, not when reacting with a simple chloride salt.
- Hydrogen gas: Hydrogen gas is colorless, but it is not produced in this specific reaction involving chloride salts and concentrated sulfuric acid.
Therefore, the correct answer is Hydrogen chloride gas.
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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