Assertion (A): The Montreal Protocol was signed to control the emission of CFCs. Reason (R): CFCs are responsible for the depletion of the ozone layer. MCQ with Answer and Explanation
Assertion (A): The Montreal Protocol was signed to control the emission of CFCs. Reason (R): CFCs are responsible for the depletion of the ozone layer.
A. Both A and R are true and R is the correct explanation of A.
B. A is true but R is false.
C. Both A and R are true but R is NOT the correct explanation of A.
D. A is false but R is true.
Answer: Option A
Solution (By JKSSB Mock Tests)
The Montreal Protocol is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances responsible for ozone depletion, most notably chlorofluorocarbons (CFCs). Both statements are correct, and R perfectly explains the purpose of the protocol.
Explanation:
Biogas is produced from anaerobic digestion of organic waste (cow dung, agricultural residue) and is renewable. Mainly methane and CO₂. Coal, petroleum, and natural gas are fossil fuels formed over millions of years, non-renewable. Biogas plants generate clean fuel and also produce enriched manure. Charcoal is also not a fossil fuel; it's from wood pyrolysis.
Assertion (A): A catalyst does not change the equilibrium yield of a reaction. Reason (R): A catalyst speeds up both the forward and backward reactions equally.
A.A is false but R is true.
B.Both A and R are true but R is NOT the correct explanation of A.
C.A is true but R is false.
D.Both A and R are true and R is the correct explanation of A.
Explanation:
A catalyst lowers the activation energy for both the forward and reverse reactions by the same amount. Therefore, it increases the rates of both reactions equally, allowing the system to reach equilibrium faster, but without changing the final equilibrium concentrations (yield). Both statements are correct and R explains A.
Consider the following statements: 1. Chromatography separates components based on differential adsorption. 2. The component that is more strongly adsorbed moves faster. Which statement(s) is/are correct?
Explanation:
Chromatography is an advanced technique used to separate mixtures based on the differential adsorption of components onto a stationary phase. The component that is more strongly adsorbed to the stationary phase moves slower, not faster. Therefore, only statement 1 is correct, making option A the right choice.
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