AP Polycet (Polytechnic) 2022 Previous Question Paper with Answers And Model Papers With Complete Analysis

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Polycet Mock Test

116) Which of the following metals liberates H2 on reaction with steam but not with cold water?

A) Pb
B) Na
C) Fe
D) K

View Answer
C) Fe

Explanation:Iron (Fe) reacts with steam, but not with cold water, producing H₂ gas.
Answer:Fe

117) The numbers of sigma (σ) and pi (π) bonds in C2H2 molecule is

A) 3 sigma and zero pi
B) 3 sigma and 2 pi
C) 2 sigma and 3 pi
D) 4 sigma and 1 pi

View Answer
B) 3 sigma and 2 pi

Explanation:In ethyne (C₂H₂):
Each carbon forms 1 σ-bond with H and 1 σ-bond between C–CBetween C≡C, 1 σ + 2 π bonds
→ Total: 3 σ and 2 π bonds
Answer:3 sigma and 2 pi

118) Which of the following is not a conductor?

A) Graphite
B) Carbon nanotubes
C) Diamond
D) All of these

View Answer
C) Diamond

Explanation:Diamond is a poor conductor (all electrons are bonded), unlike graphite and nanotubes.
Answer:Diamond

119) Which of the following is an unsaturated hydrocarbon?

A) Butane
B) Butyne
C) Isobutane
D) Cyclobutane

View Answer
B) Butyne

Explanation:Butyne contains a triple bond ⇒ unsaturated hydrocarbon.
Answer:Butyne

120) What does an oxidizing agent do?

A) It reduces other substance and itself undergoes oxidation
B) It reduces other substance and itself undergoes reduction
C) It oxidizes other substance and itself undergoes oxidation
D) It oxidizes other substance and itself undergoes reduction

View Answer
D) It oxidizes other substance and itself undergoes reduction

Explanation:An oxidizing agent causes oxidation of another substance and itself gets reduced.
Answer:It oxidizes other substance and itself undergoes reduction

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