The phenomenon where a product of a reaction acts as a catalyst for the same reaction is called:
A. Negative catalysis
B. Autocatalysis
C. Enzyme catalysis
D. Heterogeneous catalysis
Answer: Option B
Solution (By JKExamLibrary)
Autocatalysis occurs when one of the products of a chemical reaction acts as a catalyst for that same reaction. As the reaction proceeds and the product accumulates, the rate of the reaction increases. A classic example is the oxidation of oxalic acid by potassium permanganate, where the Mn2+ ions produced catalyze the reaction.
Explanation:
A gel is a type of colloid where the dispersed phase is a liquid and the dispersed medium is a solid. Cheese, butter, and jellies are classic examples of gels. Milk is an emulsion (liquid in liquid), while fog and smoke are aerosols.
Explanation:
Combination: two or more reactants combine to one product. Mg and O₂ combine to form MgO. A is decomposition; B is displacement; D is double displacement.
Explanation:
Saline water (containing NaCl) increases the electrical conductivity of the water, accelerating the electrochemical process of rusting. This is why ships and coastal structures rust faster. Dry air and vacuum have no moisture; pure water without dissolved oxygen slows rusting.
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