The reactivity series ranks metals based on their tendency to: MCQ with Answer and Explanation

The reactivity series ranks metals based on their tendency to:
A. Lose electrons and form positive ions
B. Form covalent bonds
C. Accept electrons
D. Absorb hydrogen
Answer: Option A
Solution (By JKExamLibrary)
Reactivity series orders metals according to their ease of oxidation—i.e., losing electrons to form cations. At the top (K, Na) are strong reducing agents, reacting vigorously with water and acids; at the bottom (Au, Pt) are noble metals, resistant to corrosion. The series helps predict displacement reactions and extraction methods. Mnemonic: 'Please Stop Calling Me A Cute Zebra...' etc.

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Which process is used to concentrate sulfide ores?
A. Leaching with NaOH
B. Calcination
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Correct Answer: Option C


Explanation:
Froth flotation separates sulfide ore particles from gangue by using oil and water. The ore particles adhere to the froth and float, while gangue sinks. Used for ZnS, PbS, CuFeS₂. Magnetic separation for magnetite, leaching for bauxite.

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Question #2
Which catalyst is used in the hydrogenation of unsaturated vegetable oils?
A. Iron
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Correct Answer: Option C


Explanation:
Finely divided nickel catalyzes the addition of hydrogen to liquid oils to form solid fats (vanaspati ghee). Platinum/palladium also work but are expensive. Iron is used in Haber process; V₂O₅ in Contact process.

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Question #3
Which type of glass is used for making laboratory glassware and cookware due to its high thermal resistance?
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Correct Answer: Option C


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