Consider the following statements: 1. Galvanization involves coating iron with zinc. 2. Sacrificial protection uses a more reactive metal to protect iron. Which is/are correct? MCQ with Answer and Explanation
Consider the following statements: 1. Galvanization involves coating iron with zinc. 2. Sacrificial protection uses a more reactive metal to protect iron. Which is/are correct?
A. 2 only
B. 1 only
C. Both 1 and 2
D. Neither 1 nor 2
Answer: Option C
Solution (By JKSSB Mock Tests)
Galvanization is the process of applying a protective zinc coating to iron to prevent rusting. Sacrificial protection (or cathodic protection) involves connecting iron to a more reactive metal (like magnesium or zinc). The more reactive metal oxidizes preferentially, sacrificing itself to protect the iron. Both statements are correct.
Explanation:
Ethylene (C₂H₄) is systematically named ethene. The -ene suffix indicates a double bond. Ethane is C₂H₆, ethyne (acetylene) is C₂H₂, methane is CH₄. Ethene is an important petrochemical used to make polythene.
Explanation:
Nitric acid (HNO₃) is used for nitration reactions to produce explosives such as TNT (trinitrotoluene), nitroglycerin, and dynamite. Sulfuric acid acts as a catalyst/dehydrating agent in nitration mixtures (mixed acid). HCl is used for cleaning and chemical synthesis. Acetic acid is organic acid. Nitric acid provides nitro groups (-NO₂).
Explanation:
A catalyst speeds up (positive catalyst) or slows down (negative catalyst) a chemical reaction by providing an alternative pathway with a lower (or higher) activation energy. It remains chemically unchanged and in the same amount at the end of the reaction, and does not alter the equilibrium position.
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