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Air Oxygen and Oxides Video Lecture | Chemistry Class 7 ICSE

FAQs on Air Oxygen and Oxides Video Lecture - Chemistry Class 7 ICSE

1. What is the composition of air, and why is oxygen important for life?

Ans. Air is primarily composed of nitrogen (about 78%), oxygen (about 21%), and small amounts of other gases such as carbon dioxide, argon, and water vapor. Oxygen is essential for life as it is required for respiration in most living organisms. During respiration, oxygen helps in the process of converting food into energy, which is crucial for sustaining life.

2. What are oxides, and how are they classified?

Ans. Oxides are chemical compounds formed when oxygen combines with another element. They can be classified into two main categories: basic oxides, which react with acids to form salts and water, and acidic oxides, which react with bases to form salts and water. There are also amphoteric oxides, which can react with both acids and bases, and neutral oxides, which do not exhibit acidic or basic properties.

3. How do plants contribute to the oxygen cycle?

Ans. Plants play a vital role in the oxygen cycle through the process of photosynthesis. During photosynthesis, plants take in carbon dioxide (CO₂) from the air and, using sunlight, convert it into glucose and oxygen (O₂). The oxygen produced is released into the atmosphere, replenishing the oxygen supply that animals and humans need for breathing.

4. What is the significance of carbon dioxide in the atmosphere?

Ans. Carbon dioxide is a crucial component of the Earth's atmosphere, making up about 0.04% of the air. It plays a significant role in the greenhouse effect, which helps regulate the Earth's temperature. It is also used by plants during photosynthesis to produce oxygen and glucose. However, an excess of carbon dioxide due to human activities can lead to global warming and climate change.

5. What are the common uses of oxygen and oxides in everyday life?

Ans. Oxygen is widely used in various applications, including medical use for patients needing respiratory support, in welding and metal cutting processes, and in water treatment to support aquatic life. Oxides have diverse uses as well; for example, iron oxides are used in pigments, aluminum oxide is used as an abrasive, and silicon dioxide is used in glassmaking.

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Oct 05, 2025 Last updated

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	Chemistry Class 7 ICSE 33 videos\|58 docs\|7 tests

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