In two closed containers, substances A and B are present. After sometime, the lid of the container containing substance A along with a lot of pressure got off. This is because substance A ______.

Explanation

To solve the question, we need to analyze the situation described in the problem. Here’s a step-by-step solution:

1. **Understanding the Situation**: We have two closed containers, one with substance A and the other with substance B. The lid of the container with substance A comes off due to a lot of pressure.

**Hint**: Think about what could cause pressure to build up in a closed container.

2. **Identifying the Nature of Substance A**: The fact that the lid came off with a lot of pressure suggests that substance A is undergoing a change that produces gas. This is indicative of a substance that can transition from solid to gas without going through a liquid state.

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