NEET UG CHEMISTRY Multiple Choice Questions (MCQs)

NEET UG - Physical Chemistry Questions

1. Which of the following best defines an element?
   a) A substance made up of two or more atoms
   b) A substance made up of identical atoms
   c) A substance that cannot be broken down by chemical means
   d) A substance that can be decomposed into simpler substances
   
   Answer: b) A substance made up of identical atoms
2. What is the empirical formula of a compound with the molecular formula C6H12O6?
   a) CH2O
   b) C3H6O3
   c) C6H12O6
   d) C2H4O2
   
   Answer: a) CH2O
3. Which law is explained by the fact that the ratio of masses of two elements forming a compound is constant?
   a) Law of Multiple Proportions
   b) Law of Definite Proportions
   c) Law of Conservation of Mass
   d) Gay-Lussac's Law
   
   Answer: b) Law of Definite Proportions
4. The molar mass of water (H2O) is approximately:
   a) 18 g/mol
   b) 16 g/mol
   c) 20 g/mol
   d) 14 g/mol
   
   Answer: a) 18 g/mol
5. What is the molecular mass of methane (CH4)?
   a) 16 g/mol
   b) 12 g/mol
   c) 18 g/mol
   d) 32 g/mol
   
   Answer: a) 16 g/mol
6. The mass of 1 mole of an element is called its:
   a) Atomic number
   b) Atomic mass
   c) Molar mass
   d) Molecular weight
   
   Answer: c) Molar mass
7. If the percentage composition of a compound is 40% carbon, 6.7% hydrogen, and 53.3% oxygen, the empirical formula is:
   a) CH2O
   b) CH3O
   c) C2H6O
   d) CH3
   
   Answer: a) CH2O
8. Which of the following is a correct representation of a chemical equation?
   a) H2 + O2 → H2O
   b) H2O + CO2 → H2CO3
   c) Na + Cl2 → NaCl
   d) All of the above
   
   Answer: d) All of the above
9. What is the mole concept used for?
   a) To calculate the number of molecules in a sample
   b) To determine the volume of a gas at STP
   c) To relate the mass of a substance to the number of particles
   d) All of the above
   
   Answer: d) All of the above
10. The chemical equation: 2H2 + O2 → 2H2O is an example of:
    a) Combination reaction
    b) Decomposition reaction
    c) Displacement reaction
    d) Redox reaction
    
    Answer: a) Combination reaction
11. What is the empirical formula of a compound containing 2.0 g of hydrogen and 16.0 g of oxygen?
    a) H2O
    b) H2O2
    c) H2O3
    d) H2O4
    
    Answer: a) H2O
12. Which of the following laws explains the concept of the mole?
    a) Law of Constant Composition
    b) Avogadro's Law
    c) Boyle’s Law
    d) Law of Conservation of Energy
    
    Answer: b) Avogadro's Law
13. The molecular weight of a compound is:
    a) The sum of the atomic weights of all atoms in the molecule
    b) The number of atoms present in the molecule
    c) The weight of the molecule in grams
    d) The ratio of the number of moles of a substance
    
    Answer: a) The sum of the atomic weights of all atoms in the molecule
14. Which of the following best describes the concept of stoichiometry?
    a) The calculation of quantities in chemical reactions
    b) The study of gases and their properties
    c) The measurement of atomic masses
    d) The determination of molecular shapes
    
    Answer: a) The calculation of quantities in chemical reactions

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