TS Polycet (Polytechnic) 2021 Previous Question Paper with Answers And Model Papers With Complete Analysis

101) In electrolytic refining of metals, the pure metal is taken as

A) Anode
B) Cathode
C) Electrolyte
D) Vessel

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B) Cathode

Explanation:In electrolytic refining, pure metalis deposited on the cathode.
Answer: Cathode

102) The reaction that takes place in Thermite process is

A) Reduction
B) Oxidation
C) Neutralisation
D) None of the above

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A) Reduction

Explanation:Thermite processinvolves reductionof metal oxides (e.g., Fe₂O₃) using aluminum.
Answer: Reduction

103) What does the symbol ‘A’ represent in a chemical equation

A) Catalyst
B) Precipitate
C) Heating
D) Physical state

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C) Heating

Explanation:Symbol Δ(A) in a chemical equation indicates heating.
Answer: Heating

104) The product formed when quick lime reacts with water is

A) CaSO₄
B) Ca(OH)₂
C) CaCO₃
D) CaCl₂

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B) Ca(OH)₂

Explanation:Quick lime = CaO, reacts with water to form Ca(OH)₂ (slaked lime).
Answer: Ca(OH)₂

105) Which one of the following is not a product in the electrolysis of aqueous NaCl

A) NaOH
B) O₂
C) Cl₂
D) H₂

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B) O₂

Explanation:Electrolysis of aqueous NaCl gives NaOH, Cl₂, H₂. Not O₂.
Answer: O₂

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