Question
Download Solution PDFWhich of the following gas is evolved when ethanol reacts with sodium
This question was previously asked in
Bihar STET TGT (Science) Official Paper-I (Held On: 08 Sept, 2023 Shift 1)
Answer (Detailed Solution Below)
Option 2 : H2
Free Tests
View all Free tests >
Bihar STET Paper 1 Mathematics Full Test 1
13.7 K Users
150 Questions
150 Marks
150 Mins
Detailed Solution
Download Solution PDFExplanation:-
- Ethanol belongs to the class of compounds known as alcohols. Its chemical formula is CH3CH2OH, indicating it has two carbon atoms, six hydrogen atoms, and a hydroxyl group (-OH).
- When sodium reacts with an alcohol like ethanol, it tends to donate this electron to the oxygen atom in the hydroxyl (-OH) group of the alcohol. This electron donation leads to the formation of a bond between the sodium and the oxygen atom of the alcohol, creating a compound called an alkoxide (in this case, sodium ethoxide).
- The specific reaction between ethanol and sodium can be represented as:
- 2CH3CH2OH + 2Na --> 2CH3CH2ONa + H2
- In this balanced chemical equation, two molecules of ethanol (CH3CH2OH) react with two atoms of sodium (Na), forming two molecules of sodium ethoxide (CH3CH2ONa) and one molecule of hydrogen gas (H2).
- Hydrogen gas is the byproduct of this reaction and is released as bubbles if the reaction occurs in a liquid medium.
- This reaction is a type of oxidation-reduction (redox) reaction. Here, sodium gets oxidized (loses an electron), and the hydrogen in the alcohol's hydroxyl group gets reduced (gains an electron) forming hydrogen gas.
Conclusion:-
When ethanol reacts with sodium, the gas evolved is hydrogen (H2), not carbon dioxide (CO2), oxygen (O2), or nitrogen (N2).
Last updated on Jan 29, 2025
-> The Bihar STET 2025 Notification will be released soon.
-> The written exam will consist of Paper-I and Paper-II of 150 marks each.
-> The candidates should go through the Bihar STET selection process to have an idea of the selection procedure in detail.
-> For revision and practice for the exam, solve Bihar STET Previous Year Papers.