NEET CHEMISTRY QUIZ 25 MCQS TEST

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NEET Chemistry – 25 MCQ Test

25 NEET-pattern Chemistry multiple choice questions

Select one answer for each question and click Submit Test.

Some Basic Concepts

1. Avogadro's number is approximately:

(1) 6.022 × 10²⁰ (2) 6.022 × 10²³ (3) 3.011 × 10²³ (4) 9.8 × 10²³

Correct Answer: (2) 6.022 × 10²³

Mole Concept

2. The number of moles present in 18 g of water (H₂O) is:

(1) 0.5 mol (2) 2 mol (3) 1 mol (4) 18 mol

Correct Answer: (3) 1 mol

Atomic Structure

3. The maximum number of electrons that can be accommodated in the second shell is:

(1) 8 (2) 2 (3) 18 (4) 32

Correct Answer: (1) 8

Periodic Table

4. Which element has the highest electronegativity?

(1) Oxygen (2) Chlorine (3) Nitrogen (4) Fluorine

Correct Answer: (4) Fluorine

Chemical Bonding

5. The shape of a methane (CH₄) molecule is:

(1) Square planar (2) Tetrahedral (3) Trigonal planar (4) Linear

Correct Answer: (2) Tetrahedral

Chemical Bonding

6. Which type of bond is formed by sharing of electron pairs between atoms?

(1) Ionic bond (2) Metallic bond (3) Covalent bond (4) Hydrogen bond

Correct Answer: (3) Covalent bond

Thermodynamics

7. At constant pressure, the heat absorbed by a system is equal to:

(1) Enthalpy change (ΔH) (2) Entropy change only (3) Gibbs energy only (4) Internal energy only

Correct Answer: (1) Enthalpy change (ΔH)

Equilibrium

8. The pH of a neutral aqueous solution at 25°C is:

(1) 0 (2) 1 (3) 14 (4) 7

Correct Answer: (4) 7

Redox Reactions

9. Oxidation is defined as:

(1) Gain of electrons (2) Loss of electrons (3) Gain of neutrons (4) Loss of protons only

Correct Answer: (2) Loss of electrons

Electrochemistry

10. The SI unit of electrical conductance is:

(1) Ohm (2) Volt (3) Siemens (4) Coulomb

Correct Answer: (3) Siemens

Solutions

11. The concentration expressed as moles of solute per litre of solution is called:

(1) Molarity (2) Molality (3) Mole fraction (4) Mass percentage

Correct Answer: (1) Molarity

Chemical Kinetics

12. The rate of a chemical reaction generally increases with:

(1) Decrease in temperature (2) Removal of all reactants (3) Decrease in effective collisions (4) Increase in temperature

Correct Answer: (4) Increase in temperature

Surface Chemistry

13. The phenomenon of accumulation of molecules on the surface of a substance is called:

(1) Absorption (2) Adsorption (3) Diffusion (4) Osmosis

Correct Answer: (2) Adsorption

Organic Chemistry

14. The functional group present in alcohols is:

(1) –COOH (2) –CHO (3) –OH (4) –CO–

Correct Answer: (3) –OH

Hydrocarbons

15. The general formula of alkanes is:

(1) CₙH₂ₙ₊₂ (2) CₙH₂ₙ (3) CₙH₂ₙ₋₂ (4) CₙHₙ

Correct Answer: (1) CₙH₂ₙ₊₂

Hydrocarbons

16. Benzene contains how many π bonds in its usual structural representation?

(1) 1 (2) 2 (3) 4 (4) 3

Correct Answer: (4) 3

Haloalkanes

17. Which halogen has the highest atomic mass among the following?

(1) Fluorine (2) Iodine (3) Chlorine (4) Bromine

Correct Answer: (2) Iodine

Alcohols & Phenols

18. Phenol is more acidic than ethanol mainly because:

(1) Phenol has more hydrogen atoms (2) Ethanol is aromatic (3) Phenoxide ion is resonance-stabilized (4) Phenol contains no oxygen

Correct Answer: (3) Phenoxide ion is resonance-stabilized

Aldehydes & Ketones

19. The functional group of aldehydes is:

(1) –CHO (2) –COOH (3) –OH (4) –NH₂

Correct Answer: (1) –CHO

Carboxylic Acids

20. The functional group characteristic of carboxylic acids is:

(1) –OH (2) –CHO (3) –NH₂ (4) –COOH

Correct Answer: (4) –COOH

Amines

21. The functional group present in primary amines is:

(1) –OH (2) –NH₂ (3) –COOH (4) –CHO

Correct Answer: (2) –NH₂

Biomolecules

22. The basic structural units of proteins are:

(1) Fatty acids (2) Monosaccharides (3) Amino acids (4) Nucleotides

Correct Answer: (3) Amino acids

Biomolecules

23. The sugar present in DNA is:

(1) Deoxyribose (2) Ribose (3) Glucose (4) Fructose

Correct Answer: (1) Deoxyribose

Coordination Compounds

24. The coordination number of the central metal ion in [Co(NH₃)₆]³⁺ is:

(1) 3 (2) 4 (3) 5 (4) 6

Correct Answer: (4) 6

d-Block Elements

25. Which of the following is a transition element?

(1) Na (2) Fe (3) Mg (4) Al

Correct Answer: (2) Fe

NEET Chemistry Practice Test • 25 Questions