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Questions and Answers
Which of the following precautions should be taken while preparing the gas?
Which of the following precautions should be taken while preparing the gas?
- Nitric acid should be used in the preparation of hydrogen from metals.
- The gas should be collected before all the air in the apparatus has escaped.
- The apparatus should be airtight and there should be no leakage of gas. (correct)
- There should be a flame burning near the apparatus.
What happens when a mixture of hydrogen and air is brought near a flame?
What happens when a mixture of hydrogen and air is brought near a flame?
- The mixture turns into a liquid.
- The mixture becomes more stable.
- The mixture explodes violently. (correct)
- The mixture creates a strong odor.
Why is nitric acid not used in the preparation of hydrogen from metals?
Why is nitric acid not used in the preparation of hydrogen from metals?
- Nitric acid is not readily available.
- Nitric acid is too expensive.
- Nitric acid is a powerful oxidizing agent. (correct)
- Nitric acid is not reactive enough.
How can it be determined if all the air has escaped from the apparatus?
How can it be determined if all the air has escaped from the apparatus?
Why should the end of the thistle funnel be dipped under acid?
Why should the end of the thistle funnel be dipped under acid?
What happens if a mixture of hydrogen and air is brought near a flame?
What happens if a mixture of hydrogen and air is brought near a flame?
Which of the following is a precaution that should be taken while preparing the gas?
Which of the following is a precaution that should be taken while preparing the gas?
Why is nitric acid not used in the preparation of hydrogen from metals?
Why is nitric acid not used in the preparation of hydrogen from metals?
What can be done to determine if all the air has escaped from the apparatus?
What can be done to determine if all the air has escaped from the apparatus?
Why should the end of the thistle funnel be dipped under acid?
Why should the end of the thistle funnel be dipped under acid?
Study Notes
Preparing Gas Safely
- Precautions include working in a well-ventilated area to avoid gas accumulation, using safety goggles, and keeping flammable materials away.
- Ensure all connections in the apparatus are tight to prevent leaks of flammable gases.
Hydrogen and Air Mixture
- When a mixture of hydrogen and air is ignited near a flame, it results in a highly exothermic reaction, producing a loud explosion and water vapor.
Nitric Acid and Metal Reaction
- Nitric acid is not used in hydrogen preparation from metals as it is a strong oxidizing agent, which can produce nitrogen oxides instead of hydrogen.
Air Escape Determination
- To verify that all air has been displaced from the apparatus, observe whether the gas flow is steady and consistent, indicative of pure gas without air interference.
- Using a method such as the 'upside-down water test' can help visualize the completeness of gas displacement.
Thistle Funnel Function
- Dipping the end of the thistle funnel under acid prevents air from entering the system and ensures that the gas produced is pure and uncontaminated, optimizing the reaction.
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Description
Gas Preparation Precautions Quiz: Test your knowledge on the necessary precautions to take while preparing a potentially explosive gas mixture of hydrogen and air. Learn about ensuring an airtight apparatus, avoiding flames, and safely collecting the gas. Take the quiz now to assess your understanding of gas preparation safety measures.
