Consider the following statements: 1. Oxidation involves the loss of electrons. 2. A reducing agent gets reduced in a reaction. Which is/are correct? MCQ with Answer and Explanation
Consider the following statements: 1. Oxidation involves the loss of electrons. 2. A reducing agent gets reduced in a reaction. Which is/are correct?
A. 1 only
B. Both 1 and 2
C. 2 only
D. Neither 1 nor 2
Answer: Option A
Solution (By JKSSB Mock Tests)
Oxidation is defined as the loss of electrons (or an increase in oxidation state). A reducing agent is a substance that donates electrons to another species, thereby causing the other species to be reduced. In doing so, the reducing agent itself gets oxidized. Thus, statement 1 is correct, but 2 is incorrect.
Explanation:
Pure rainwater naturally has pH about 5.6 because CO₂ from air dissolves and forms carbonic acid. This is not considered acid rain. Acid rain has pH below 5.0 (due to SO₂ and NOₓ).
Explanation:
Hydrochloric acid (HCl) is a strong acid because it completely dissociates into H⁺ and Cl⁻ ions in aqueous solution. Acetic, citric, and carbonic acids are weak acids as they only partially dissociate in water, establishing an equilibrium between the unionized molecules and their ions.
Explanation:
Ethanol (C₂H₅OH) on heating with excess concentrated H₂SO₄ (dehydrating agent) at 170°C undergoes dehydration to give ethene (C₂H₄). This is an elimination reaction. Oxidation gives ethanoic acid; hydrogenation adds H₂; fermentation produces ethanol.
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