NEET problems

217 problems for NEET practice, in Physics, Chemistry and Biology, each with a worked solution. Try each one on paper first, then check your answer.

All SubjectsPhysicsChemistryMathematicsBiologyPython ProgrammingStatistics & Data Science

All LevelsHigh School (9–10)High School (11–12)General

All TopicsStates of MatterMixtures and SolutionsAtoms and MoleculesStructure of the AtomChemical ReactionsAcids, Bases and SaltsMetals and Non-metalsCarbon and Its CompoundsThe Periodic TableChemical BondingChemical Thermodynamics

Choose a topic to see its subtopics.

AllEasyMediumHard

↺ Reset filtersSortMixedNewest firstOldest firstA to Z41 problems

Type:AnyConceptualNumerical

1.

Supercooled water freezes at 263 K. Take Δ H = -6.01 kJ/mol and Δ Ssystem = -22.0 J/(K mol). New

High School (11–12) · Entropy, Gibbs Energy and SpontaneityNEET, Board ExamStemPy Lab

Hard

2.

For N₂O₄(g) ⇌ 2NO₂(g), Δ H° = +57.2 kJ/mol and Δ S° = +175.8 J/(K mol). New

High School (11–12) · Entropy, Gibbs Energy and SpontaneityJEE Main, NEET, BITSAT, WBJEE, Board Exam, AP, A-Level, IBStemPy Lab

Hard

3.

For CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l), Δ H = -890.3 kJ mol⁻¹ at 298 K. New

High School (11–12) · Enthalpy and Hess's LawNEET, Board ExamStemPy Lab

Medium

4.

0.600 g of graphite burns completely in a bomb calorimeter whose heat capacity is 12.5 kJ K⁻¹. New

High School (11–12) · Enthalpy and Hess's LawNEET, Board ExamStemPy Lab

Medium

5.

Argon is close to an ideal gas, with Cv = 12.47 J K⁻¹mol⁻¹. New

High School (11–12) · Enthalpy and Hess's LawNEET, Board ExamStemPy Lab

Medium

6.

Quicklime is made by heating limestone: CaCO₃(s) → CaO(s) + CO₂(g). New

High School (11–12) · Enthalpy and Hess's LawNEET, Board Exam, AP, A-Level, IBStemPy Lab

Medium

7.

How much heat turns 36.0 g of ice at 273 K into steam at 373 K? New

High School (11–12) · Enthalpy and Hess's LawNEET, Board Exam, AP, A-Level, IBStemPy Lab

Medium

8.

Methane cannot be made cleanly from carbon and hydrogen, so its Δf H° is found with Hess's law. New

High School (11–12) · Enthalpy and Hess's LawJEE Main, NEET, BITSAT, WBJEE, Board Exam, AP, A-Level, IB, GaokaoStemPy Lab

Medium

9.

Estimate Δr H for C₂H₄(g) + H₂(g) → C₂H₆(g) from the mean bond enthalpies: C=C 611, H-H 435, C-C… New

High School (11–12) · Enthalpy and Hess's LawNEET, Board Exam, AP, A-Level, IBStemPy Lab

Medium

10.

Breaking one mole of CH₄(g) into atoms takes 1665 kJ. New

High School (11–12) · Enthalpy and Hess's LawJEE Main, NEET, BITSAT, WBJEE, Board Exam, AP, A-Level, IB, GaokaoStemPy Lab

Hard

11.

A gas in an insulated cylinder is compressed by 450 J of work. New

High School (11–12) · Systems, Work, Heat and the First LawNEET, Board ExamStemPy Lab

Medium

12.

A gas goes through a cycle of three steps and ends in its starting state. New

High School (11–12) · Systems, Work, Heat and the First LawNEET, Board ExamStemPy Lab

Medium

13.

2.00 mol of an ideal gas at 310 K expands reversibly and at constant temperature from 5.00 L to… New

High School (11–12) · Systems, Work, Heat and the First LawNEET, Board ExamStemPy Lab

Medium

14.

1.00 mol of an ideal gas at 300 K expands at constant temperature from 10.0 bar to 2.00 bar. New

High School (11–12) · Systems, Work, Heat and the First LawNEET, Board ExamStemPy Lab

Hard

15.

The C₂ molecule, found in flames and in comets, has 12 electrons. New

High School (11–12) · Molecular Orbitals and Hydrogen BondsNEET, Board ExamStemPy Lab

Medium

16.

Arrange O₂, O₂⁺, O₂⁻ and O₂²⁻ in order of increasing bond length. Which of them are paramagnetic? New

High School (11–12) · Molecular Orbitals and Hydrogen BondsNEET, Board ExamStemPy Lab

Medium

17.

The B₂ molecule has 10 electrons. Write its configuration, find its bond order, and find the number… New

High School (11–12) · Molecular Orbitals and Hydrogen BondsJEE Main, NEET, BITSAT, WBJEE, Board ExamStemPy Lab

Medium

18.

Fluorine, F₂, has 18 electrons. Write its configuration and find its bond order. New

High School (11–12) · Molecular Orbitals and Hydrogen BondsNEET, Board ExamStemPy Lab

Hard

19.

Xenon is a noble gas with 8 outer electrons, yet it forms XeF₂, XeF₄ and XeF₆. New

High School (11–12) · Shapes of Molecules and HybridisationNEET, Board Exam, AP, A-Level, IBStemPy Lab

Medium

20.

Nitrous oxide, N₂O, has the atoms in the order N-N-O. New

High School (11–12) · Lewis Structures and Ionic BondsNEET, Board Exam, AP, IBStemPy Lab

Hard

21.

Forming Mg²⁺ and O²⁻ seems costly. In kJ/mol: sublimation of magnesium +148; half the bond enthalpy… New

High School (11–12) · Lewis Structures and Ionic BondsNEET, Board Exam, A-Level, IBStemPy Lab

Hard

22.

Arrange MgO, CaO, NaF and KBr in order of decreasing lattice enthalpy. Give a reason for each step. New

High School (11–12) · Lewis Structures and Ionic BondsNEET, Board Exam, AP, A-Level, IBStemPy Lab

Medium

23.

The carbonate ion, CO₃²⁻, has three canonical forms. New

High School (11–12) · Lewis Structures and Ionic Bonds, Shapes of Molecules and HybridisationNEET, Board Exam, AP, IBStemPy Lab

Medium

24.

Chlorine monofluoride, ClF, has a dipole moment of 0.88 D and a bond length of 163 pm. New

High School (11–12) · Lewis Structures and Ionic Bonds, Shapes of Molecules and HybridisationNEET, Board ExamStemPy Lab

Medium

25.

The first four ionisation enthalpies of an element are 578, 1817, 2745 and 11577 kJ mol⁻¹. New

High School (11–12) · Periodic TrendsNEET, Board Exam, AP, A-Level, IBStemPy Lab

Medium