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Chapter 7 | Short Answer Questions and Keyword Meanings
Learn • Listen • Revise • Practise
Search all chapter topics.
Listen to a short summary of the selected subtopic in an Indian English voice, if available on your device.
Note: Audio uses your browser's text-to-speech facility. The available voice depends on your device and browser.
Select a subtopic from the index to begin.
Understand the concepts, revise the keywords and practise the questions regularly.
Prepared for students of Physical Science
Interactive Application and Reasoning Test
The audio gives a spoken overview of the concepts covered in this test. Listen before submitting your answers.
Audio summary is ready.
This test explores how curved mirrors are used in everyday life, how they form images, how they reflect light, and how to reason about the best mirror for a particular application.
Please review your selections before submitting. Your score will be calculated once you confirm submission.
For practice and assessment, review the chapter in your textbook. This test does not display the answer key or solutions.
Enter the teacher's WhatsApp number, including the country code. For India, enter 91 followed by the 10-digit mobile number.
19 Weeks • 190 MCQs • Learn, Practise, Improve!
Every correct answer takes you one step forward.
Enter your details before starting. Your details are included in the score report.
Select a week and begin your practice.
Complete a week to record your score. Each week carries 10 marks.
Weeks completed: 0 / 19
| Week | Topic | Score | Status |
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Enter your teacher's WhatsApp mobile number. Confirm the number before opening WhatsApp.
For India, use 91 followed by the 10-digit mobile number. Do not include +, spaces or hyphens.
WhatsApp will open with a prepared message. Review it and press Send. This page does not send messages automatically.
Learning goal: understand the method, not just memorise the answer!
Class IX–X Chemistry | Explore how ammonia and hydrogen chloride gases diffuse and form a white ring.
Learning by observation and simulation!
Two cotton plugs are soaked separately in aqueous ammonia and hydrochloric acid. They are placed at opposite ends of a long glass tube.
The animation uses coloured dots to distinguish the gases. The actual gases are colourless.
Press Start to observe the motion of the gas particles.
This is a conceptual animation, not a measurement of actual laboratory diffusion time or particle concentration.
NH₃(g) + HCl(g) → NH₄Cl(s)
Ammonia gas reacts with hydrogen chloride gas to form solid ammonium chloride, which appears as a white ring or cloud.
Ammonia has a lower molar mass than hydrogen chloride. At the same temperature, ammonia molecules have a higher average speed and generally diffuse faster.
Therefore, the white ammonium chloride ring forms closer to the HCl end.
Important: Molecular speed and diffusion rate are related, but are not identical. The experiment illustrates the general relationship between molar mass and diffusion under comparable conditions.
Select one answer for each question and click Submit Answers.
Diffusion demonstrates the continuous random motion of gas particles. Lighter gases generally diffuse faster than heavier gases under comparable conditions. The ammonia and hydrogen chloride experiment provides visible evidence of diffusion and chemical reaction.
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