10th Chemistry One Mark Test Question Paper

Secure a perfect score in your objective section by testing your knowledge with our 10th Chemistry One Marks Test Question Paper. The one-mark questions—including multiple-choice questions (MCQs), fill-in-the-blanks, and true/false statements—are crucial for boosting your overall total and building conceptual clarity. This practice paper covers high-yield textbook evaluation questions and essential creative bits from chapters like Atoms and Molecules, Periodic Classification, Solutions, and Carbon compounds. Use this test to sharpen your recall speed, eliminate minor errors, and guarantee full marks in the objective portion of your science exam.

X - CHEMISTRY

ONEMARK TEST - FULL PORTION

MARKS: 45

1. Which of the following is hygroscopic in nature?
a. ferric chloride b. silica gel
c. copper sulphate pentahydrate d. none of the above

2. H₂(g) + Cl₂(g) → 2HCl(g) is a
a. Combination Reaction b. Double Displacement Reaction
c. Decomposition Reaction d. Single Displacement Reaction

3. The molecular formula of an open chain organic compound is C₃H₆. The class of the compound is
a. alkene b. alcohol c. alkyne d. alkane

4. Which of the following has the smallest mass?
a. 2 g of He b. 6.023 × 10²³ atoms of He
c. 1 mole atoms of He d. 1 atom of He

5. The volume occupied by 4.4 g of CO₂ at S.T.P
a. 0.1 litre b. 2.24 litre c. 22.4 litre d. 0.24 litre

6. The process of coating the surface of metal with a thin layer of zinc is called
a. electroplating b. thinning c. galvanization d. painting

7. Which of the following is a triatomic molecule?
a. Helium b. Hydrogen c. Carbon dioxide d. Glucose

8. A solution is a
a. homogeneous b. heterogeneous
c. non homogeneous d. homogeneous and heterogeneous

9. Photolysis is a decomposition reaction caused by
a. heat b. light c. electricity d. mechanical energy

10. The IUPAC name of an organic compound is 3-Methyl butan-1-ol. What type compound it is?
a. Ketone b. Alcohol c. Aldehyde d. Carboxylic acid

11. Mass of 1 mole of Nitrogen atom is
a. 28 g b. 14 g c. 28 amu d. 14 amu

12. Neon shows zero electron affinity due to
a. increased density b. stable configuration of electrons
c. reduced size d. stable arrangement of neutrons

13. The number of periods and groups in the periodic table are
a. 7, 18 b. 8, 18 c. 6, 16 d. 7, 17

14. A 25% (v/v) aqueous alcohol solution means:
a. 25 ml alcohol in 75 ml of water b. 25 ml alcohol in 100 ml of water
c. 75 ml alcohol in 25 ml of water d. 25 ml alcohol in 25 ml of water

15. Which of the following statements is incorrect?
a. One mole of hydrogen gas contains Avogadro's number of atoms b. One mole of electrons stands for 6.023 × 10²³ electrons c. One mole of oxygen gas contains Avogadro's number of molecules d. 12 gram of C-12 contains Avogadro's number of atoms

16. C(s) + O₂(g) → CO₂(g) + Heat. The reaction is
a. i, ii and iv b. i and iv c. i and ii d. i, ii and iii

17. Which of the following is the universal solvent?
a. Alcohol b. Water c. Benzene d. Acetone

18. The gram molecular mass of oxygen molecule is
a. 32 g b. 17 g c. 16 g d. 18 g

19. Which of the following represents 1 amu?
a. Mass of a hydrogen atom b. 1/12^th of the mass of a C-12 atom
c. Mass of O-16 atom d. Mass of a C-12 atom

20. In the nucleus of ₂₀Ca⁴⁰, there are
a. 40 protons and 20 electrons b. 20 protons and 20 neutrons
c. 20 protons and 40 neutrons d. 20 protons and 40 electrons

21. Which of the following noble gases has 2 electrons in the outermost shell?
a. Ar b. He c. Ne d. Kr

22. The volume occupied by 1 mole of a diatomic gas at S.T.P is
a. 22.4 litre b. 44.8 litre c. 11.2 litre d. 5.6 litre

23. In the aluminothermic process the role of Al is
a. oxidizing agent b. sulphurising agent
c. reducing agent d. hydrogenating agent

24. The number of components in a binary solution is
a. 2 b. 5 c. 3 d. 4

25. Which of the following is not an "element + element → compound" type reaction?
a. 4Fe(s) + 3O₂(g) → 2Fe₂O₃(s) b. 2CO(g) + O₂(g) → 2CO₂(g)
c. C(s) + O₂(g) → CO₂(g) d. 2K(s) + Br₂(l) → 2KBr(s)

26. Which of the following represents a precipitation reaction?
a. A(s) + B(aq) → C(aq) + D(l) b. A(aq) + B(aq) → C(s) + D(aq)
c. A(aq) + B(s) → C(aq) + D(l) d. A(s) + B(s) → C(s) + D(s)

27. The pH of a solution is 3. Its [OH^-] concentration is
a. 1 × 10^-3 M b. 3 M c. 11 M d. 1 × 10^-11 M

28. Rectified spirit is an aqueous solution which contains about _______ of ethanol.
a. 95.5% b. 55.5% c. 75.5% d. 45.5%

29. Which of the following pairs can be the successive members of a homologous series?
a. C₂H₂ and C₂H₄ b. C₂H₅OH and C₄H₈OH
c. C₃H₈ and C₄H₁₀ d. CH₄ and C₃H₆

30. Chemical formula of rust is
a. FeO b. Fe₂O₃·xH₂O c. FeO·xH₂O d. FeOxH₂O

31. Solubility of NaCl in 100 ml water is 36 g. If 25 g of salt is dissolved, more required for saturation is
a. 16 g b. 11 g c. 20 g d. 12 g

32. Deliquescence is due to
a. inertness to water b. strong affinity to water
c. less affinity to water d. strong hatred to water

33. Which of the following statement is wrong about detergents?
a. It is effective even in hard water b. It is sodium salts of sulphonic acids c. It is a sodium salt of long chain fatty acids d. The ionic part is -SO₃^-Na⁺

34. 1 mole of any substance contains _______ molecules.
a. 6.023 × 10²³ b. 3.0115 × 10²³
c. 12.046 × 10²³ d. 6.023 × 10^-23

35. The basis of modern periodic law is
a. atomic mass b. isotopic mass c. atomic number d. number of neutrons

36. _______ group contains the members of halogen family.
a. 18^th b. 17^th c. 16^th d. 15^th

37. _______ is a relative periodic property.
a. ionic radii b. atomic radii c. electronegativity d. electron affinity

38. Identify the non-aqueous solution:
a. sulphur in carbon disulphide b. sodium chloride in water
c. copper sulphate in water d. glucose in water

39. When pressure is increased at constant temperature the solubility of gases in liquid
a. decreases b. increases c. no change d. no reaction

40. Na₂SO₄(aq) + BaCl₂(aq) → BaSO₄(s)↓ + 2NaCl(aq) represents
a. combustion b. neutralisation c. precipitation d. single displacement

41. Which of the following statements are correct about chemical equilibrium?
a. i, ii and iv b. i, iii and iv c. ii, iii and iv d. i, ii and iii

42. A single displacement reaction: X + 2HCl → XCl₂ + H₂. X could be
a. ii and iii b. i and iv c. i and ii d. iii and iv

43. C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O is
a. Oxidation of ethanal b. Reduction of ethanol
c. Combustion of ethanol d. Oxidation of ethanoic acid

44. Which of the following are used as anaesthetics?
a. Esters b. Ethers c. Aldehydes d. Carboxylic acids

45. TFM in soaps represents
a. carbohydrate b. mineral c. fatty acid d. vitamin