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. A is false but R is true.
B. A is true but R is false.
C. Both A and R are true and R is the correct explanation of A.
D. Both A and R are true but R is NOT the correct explanation of A.
Answer: Option C
Solution (By JKExamLibrary)
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:
Ozone (O₃) has one coordinate bond; a central oxygen donates a lone pair to another oxygen. CH₄, NH₃, H₂O have ordinary covalent bonds, though NH₃ can donate a pair to form NH₄⁺.
Explanation:
The Chlor-alkali process involves the electrolysis of aqueous NaCl (brine). It produces sodium hydroxide (NaOH) at the cathode, chlorine gas (Cl₂) at the anode, and hydrogen gas (H₂) at the cathode. The Solvay process produces sodium carbonate, not sodium hydroxide.
Explanation:
Isobars: same mass number, different atomic number. Example: ⁴⁰Ar, ⁴⁰Ca. Isotopes: same atomic number, different mass number. Isotones: same number of neutrons. Isomers: same molecular formula, different structure.
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