When a solid B was heated in a test-tube, it gave off two gases. The two gases were separated by passing them through a plug of glass wool in a test-tube as shown below.
![Chemf4et1p1q5](https://www.easyelimu.com/images/form_4_past_papers/Form4_EndTerm1_2021/chemi_paper_1_2_3/Chemf4et1p1q5.JPG)
The first gas which evolved turned moist red litmus paper to blue. Later the other gas involved turned the litmus back to red.
- Identify solid B
- Write the equation for the reaction that take place in the test tube