Which of the following molecules has a linear shape? MCQ with Answer and Explanation

Which of the following molecules has a linear shape?
A. H₂O
B. CH₄
C. CO₂
D. NH₃
Answer: Option C
Solution (By JKExamLibrary)
CO₂ has sp hybridized carbon, forming two double bonds with oxygen in a linear arrangement (O=C=O) with bond angle 180°. H₂O is bent (angular, 104.5°), NH₃ is trigonal pyramidal (107°), CH₄ is tetrahedral (109.5°). Molecular shape is determined by VSEPR theory: CO₂ has 2 bond pairs, 0 lone pairs → linear.

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Question #1
Bleaching powder is produced by the action of chlorine on:
A. Quicklime
B. Limestone
C. Gypsum
D. Slaked lime

Correct Answer: Option D


Explanation:
Bleaching powder is calcium oxychloride, CaOCl₂, made by passing chlorine gas over dry slaked lime (Ca(OH)₂): Ca(OH)₂ + Cl₂ → CaOCl₂ + H₂O. Quicklime is CaO, limestone is CaCO₃, gypsum is CaSO₄·2H₂O. Bleaching powder is used for bleaching cotton and paper, disinfecting water, and as an oxidizing agent. It releases chlorine on exposure to air or acids.

This question belongs to: Science chemistry
Question #2
An example of a negative catalyst is:
A. Alcohol in chloroform
B. V₂O₅ in Contact process
C. MnO₂ in decomposition of KClO₃
D. Fe in Haber process

Correct Answer: Option A


Explanation:
Ethanol is added to chloroform to inhibit its oxidation to phosgene (COCl₂) – a negative catalyst. Others are positive catalysts that speed up reactions.

This question belongs to: Science chemistry
Question #3
Which metal is the most reactive among the following?
A. Na
B. Fe
C. Cu
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Correct Answer: Option A


Explanation:
Reactivity series order: Na > Zn > Fe > Cu. Sodium (alkali metal) is extremely reactive, reacting violently with water. Copper is low in the series, hence used for water pipes.

This question belongs to: Science chemistry