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Assertion: Earth's atmosphere is about u...

Assertion: Earth's atmosphere is about up to a height of 3000 km.
Reason: First 75 km of earth's atmosphere is called troposphere in which lightning, thunder, cloud formation occur.

A

If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.

B

If both Assertion and Reason are true and the Reason is not the correct explanation of the Assertion.

C

If Assertion is true but the Reason is false

D

If both Assertion and Reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to evaluate both the assertion and the reason provided. ### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that "Earth's atmosphere is about up to a height of 3000 km." - This statement is incorrect. The Earth's atmosphere does not extend to 3000 km. The atmosphere is generally considered to extend up to about 600 km, with the exosphere being the outermost layer. 2. **Understanding the Reason**: - The reason states that "the first 75 km of Earth's atmosphere is called the troposphere, in which lightning, thunder, and cloud formation occur." - This statement is also incorrect. The troposphere is the lowest layer of the atmosphere, but it typically extends from the Earth's surface up to about 8 to 18 km, depending on the location (8 km at the poles and up to 18 km at the equator). 3. **Evaluating Both Statements**: - Since both the assertion and the reason are incorrect, we conclude that neither statement is true. 4. **Selecting the Correct Option**: - Based on the evaluation, the correct option is that both the assertion and the reason are false. ### Final Answer: - The correct answer is: **Option D: Both assertion and reason are false.**
To solve the question, we need to evaluate both the assertion and the reason provided. ### Step-by-Step Solution: 1. **Understanding the Assertion**: - The assertion states that "Earth's atmosphere is about up to a height of 3000 km." - This statement is incorrect. The Earth's atmosphere does not extend to 3000 km. The atmosphere is generally considered to extend up to about 600 km, with the exosphere being the outermost layer. ...
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Hydrogen accounts for approximately 75% of the mass of the universe. Hydrogen serves as the nuclear fuel of our Sun and other stars, and these are mainly composed of hydrogen. On the earth, though hydrogen is rarely found in the uncombined state. Since the earth's gravity is too weak to hold such light molecules, nearly all the H_2 originally present in the earth's atmosphere has been lost to space. In the earth's crust and oceans, hydrogen is found in water, petroleum, proteins, carbohydrates and other compounds and it is the ninth most abundant element on a mass basis. Hydrogen has three isotopes : hydrogen or protium () , deuterium or heavy hydrogen (D or ), tritium (T or ) . The physical properties of the three isotopes are different due to the difference in their masses, i.e. isotope effect. The chemical properties of the three isotopes are similar as they have the same electronic configuration. Reaction between hydrogen and oxygen is highly exothermic, and gas mixtures that contain as little as 4% by volume hydrogen in oxygen (or in air) are highly flammable and potentially explosive. 2H_(2(g))+O_(2(g)), DeltaH^(ɵ)=-485 kJmol^(-1) As hydrogen is environmentally clean it is an enormously attractive fuel. 'Hydrogen economy' is an emerging field in which it is thought that our energy needs can be met by gaseous, liquid and solid hydrogen. As hydrogen is no a naturally occuring substance such as coal, oil or natural gas, energy must be exploaded to produce hydrogen before it can be used. Which of the following is radioactive in nature?

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