Class 11 Chemistry – Daily Revision MCQ (English Medium)
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How many moles are present in 22 g of carbon dioxide (C = 12, O = 16)?
Chapter 1: Some Basic Concepts of Chemistry
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Answer: B. 0.5 mol
Molar mass of CO₂ = 12 + 2 × 16 = 44 g mol⁻¹, so moles = 22 ÷ 44 = 0.5 mol.What is the maximum number of electrons a shell with principal quantum number n = 3 can hold?
Chapter 4: Structure of Atom
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Answer: C. 18
The capacity of a shell is 2n²; for n = 3 it is 2 × 3² = 18.What is the geometry of the BF₃ molecule?
Chapter 5: Chemical Bonding
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Answer: A. Trigonal planar
Boron uses three sp² hybrid orbitals to bond with three F atoms, so BF₃ is trigonal planar with F–B–F angles of 120°.What is the oxidation number of sulphur in H₂SO₄?
Chapter 6: Redox Reactions
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Answer: D. +6
2(+1) + x + 4(−2) = 0, so x = +6.According to the modern periodic law, the properties of elements are a periodic function of their
Chapter 7: Modern Periodic Table
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Answer: B. atomic numbers
The modern periodic law is based on atomic number; Mendeleev's older law was based on atomic mass.Why are the Group 2 elements called alkaline earth metals?
Chapter 8: Elements of Group 1 and 2
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Answer: C. They occur as minerals in rocks
The textbook explains that Group 2 elements are called alkaline earth metals because they occur as minerals in rocks; they have two valence electrons.At constant temperature a gas occupies 10 L at 2 atm. If it is compressed to 5 L, what will its pressure be?
Chapter 10: States of Matter
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Answer: D. 4 atm
Boyle's law: P₁V₁ = P₂V₂, so 2 × 10 = P₂ × 5 and P₂ = 4 atm.For a system at equilibrium whose forward reaction is exothermic, increasing the temperature will
Chapter 12: Chemical Equilibrium
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Answer: A. shift the equilibrium to the left (backward)
By Le Chatelier's principle, added heat is absorbed by the endothermic (backward) reaction, so the equilibrium shifts to the left.What is the general formula of alkynes?
Chapter 15: Hydrocarbons
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Answer: C. CₙH₂ₙ₋₂
Alkynes have a carbon–carbon triple bond and the general formula CₙH₂ₙ₋₂ (e.g. ethyne, C₂H₂).Which compound is the active ingredient of the antiseptic Dettol?
Chapter 16: Chemistry in Everyday Life
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Answer: B. Chloroxylenol
Chloroxylenol, a phenol derivative, is the active ingredient (4.8% w/v) of Dettol.
Class 11: MCQ in other subjects
All questions are written by PadhaiNotes in our own words from the chapters of the official Maharashtra State Board Balbharati textbook (ebalbharati.in). Each question shows its chapter.