Answers for General Science Online Test - Online Exam - Online Quiz - Mock Test
←Go Back to Online Practice Test| Ques. Brass gets discoloured in air because of the presence of which of the following gases in air? |
| Option 1. Oxygen |
| Option 2. Hydrogen sulphide |
| Option 3. Carbon dioxide |
| Option 4. Nitrogen |
Ans. Option 2 |
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