Class 11 / FSc · first-year course practice
Class 11 FSc Chemistry Practice MCQs — Free Online Practice
You are IN first year now — these are the HSSC Part-1 topics you are actually studying. Below are 8 Chemistry MCQs with worked answers, drawn from our bank of 12. First-year chemistry's shared core — stoichiometry, atomic structure, bonding, energetics, equilibrium, electrochemistry and kinetics.
How this fits your first year
This is course practice, not an entry paper: first-year topics at Part-1 depth, one bank each for Maths, Physics and Chemistry. Topics follow the published FSc Part-1 curricula — restricted to the chapters the older FSc Part-1 books and the current Punjab edition keep in common, so both cohorts get their subjects. Each college or board's own syllabus is the final word on any year's exact list.
Preparing for the class-11 ENTRY test (matric/O-Level level)? That bank lives inside the practice engine — sign up free and the engine serves it with your class recorded.
Free sample Chemistry MCQs (with answers)
1. The number of moles present in 36 g of water (H = 1, O = 16) is:
Stoichiometry · easy
- A. 1 mol
- B. 18 mol
- C. 36 mol
- D. 2 mol
Correct answer: D
Molar mass of H₂O = 2(1) + 16 = 18 g/mol. Moles = mass ÷ molar mass = 36/18 = 2 mol — the 18 trap is the molar mass, not the mole count.
2. For an EXOTHERMIC reaction, the enthalpy change ΔH is:
Energetics (Thermochemistry) · easy
- A. negative
- B. zero
- C. positive or zero
- D. positive
Correct answer: A
Exothermic = heat LEAVES the system, so the products sit lower in enthalpy than the reactants and ΔH = H(products) − H(reactants) is negative. Endothermic carries the positive sign.
3. The hybridization of the carbon atom in methane (CH₄) is:
Chemical Bonding · easy
- A. sp
- B. sp³
- C. sp³d
- D. sp²
Correct answer: B
Methane’s carbon forms four sigma bonds in a tetrahedral arrangement (109.5°) — one s + three p hybridize to four sp³ orbitals. sp² (trigonal) and sp (linear) describe carbons with multiple bonds.
4. Which molecule contains polar bonds but is overall NON-POLAR?
Chemical Bonding · medium
- A. H₂O
- B. NH₃
- C. CO₂
- D. HCl
Correct answer: C
CO₂ is linear (O = C = O), so its two equal bond dipoles point opposite and cancel exactly. H₂O bends (104.5°) and NH₃ is pyramidal — their dipoles do NOT cancel; HCl is simply one polar bond.
5. Raising the temperature increases the rate of a reaction mainly because:
Reaction Kinetics · medium
- A. the molecules become larger at high temperature
- B. the activation energy of the reaction decreases
- C. the reaction releases more heat
- D. a larger fraction of molecules collides with energy above the activation energy
Correct answer: D
The Maxwell–Boltzmann curve spreads at higher temperature, so a bigger share of collisions clears the activation barrier — the effective collision rate rises. The activation energy itself is a property of the reaction, not of the temperature.
6. 24 g of magnesium (M = 24) is burnt in 32 g of oxygen (M = 32). The limiting reactant is:
Stoichiometry · medium
- A. neither — excess of both
- B. oxygen
- C. both are consumed fully
- D. magnesium
Correct answer: D
2Mg + O₂ → 2MgO. Moles: Mg = 24/24 = 1 mol; O₂ = 32/32 = 1 mol. Burning 1 mol Mg needs only 0.5 mol O₂, so oxygen is in excess and MAGNESIUM runs out first — the limiting reactant.
7. In the electrolysis of molten sodium chloride, sodium metal is deposited at the:
Electrochemistry · easy
- A. anode
- B. neither electrode — it stays in solution
- C. cathode
- D. both electrodes
Correct answer: C
Reduction (Na⁺ + e⁻ → Na) occurs at the cathode, which supplies electrons to the positive ions; chloride is oxidised to Cl₂ at the anode. Memory rule: cation to cathode, anion to anode.
8. The maximum number of electrons in a d subshell is:
Atomic Structure · easy
- A. 6
- B. 10
- C. 2
- D. 14
Correct answer: B
A d subshell has 5 orbitals × 2 electrons each = 10 electrons. The shell-capacity run follows the subshells (s, p, d, f) = (2, 6, 10, 14) — 2 counts an s subshell and 6 a p subshell; counting orbitals of one type per row keeps the order straight.
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All 12 first-year Chemistry questions sit in our free practice engine. It adapts to your level, tracks the topics you miss and builds a streak — and it stays 100% free.