- Trending Categories
Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Which one of the following would you need to identify the gas that evolve when you heat NaOH solution with zinc metal?
(a) Red litmus solution
(b) Blue litmus solution
(c) A burning splinter/matchstick
(d) Lime water
Correct Answer: (c) A burning splinter/matchstick
Explanation: When a base like NaOH is treated with an active metal like Zn, it produces H2 gas. And the presence of the hydrogen gas can be tested by bringing a burning splinter/ matchstick near the gas produced. The gas will burn with a pop sound confirming the presence of hydrogen gas.
$Zn(s) + 2NaOH(aq) \rightarrow Na_2ZnO_2(aq) +H_2(g)$
Advertisements