Some Basic Concepts of Chemistry Mock Test – Class 11 Chemistry

1. A sealed syringe contains of a gas at fixed temperature and pressure conditions for comparison. Another syringe of the same volume contains a different gas under the same conditions. Avogadro's law predicts:

2. A solution of is mixed with excess . A portion produces . The moles of formed are:

3. The volume of solution needed to contain of solute is:

4. Study the following limiting-reagent records for .

The case with the wrong conclusion is:

5. Study the table below.

The row that uses the wrong reporting rule is:

6. A metal wire conducts electricity, a fuel burns, and a medicine reacts in the body. These examples mainly show that chemistry studies:

7. A solution is made by dissolving of salt in of water. The mass percentage of salt is:

8. In the mixture from the reaction, of is mixed with of . What amount of forms?

9. Consider the following statements about molarity and molality:
I. Molarity depends on volume of solution.
II. Molality depends on mass of solvent.
III. Both molarity and molality must always have the same numerical value.

10. The ability of magnesium ribbon to burn in air is classified as a chemical property because:

11. A sample is represented as . The best classification is:

12. A solution of is mixed with of . For , the concentration of ions in the final solution after precipitation is:

13. A portion of is mixed with excess . For , the mass of formed is closest to . What molar mass of has been used?

14. A learner says, "Relative molecular mass of water is ." The best correction is:

15. A compound contains carbon, hydrogen, and oxygen by mass. The empirical formula is:

16. A density is reported as . What is the corresponding value in , using ?

17. A bottle label says . The most suitable interpretation is:

18. Match the physical quantity in Column I with its base unit in Column II.

19. In a laboratory notebook, the entry most likely records:

20. A solution contains of solute in . The same solution is reported in four ways below.

The row that needs correction is:

21. In agriculture, fertilizers are useful chemical products because they mainly:

22. Match each area in Column I with the most suitable chemistry-related example in Column II.

23. A naturally occurring sample of chlorine contains and . The average atomic mass is:

24. A learner compares and by fixing oxygen mass instead of carbon mass. To apply the law of multiple proportions in the usual way for these formulae, the better comparison is:

25. Consider these statements about physical and chemical changes:
I. A physical change does not produce a new substance.
II. A chemical change produces one or more new substances.
III. Every reversible change must be chemical.

26. A sample of magnesium burns completely in oxygen. Using , what mass of is formed from , with ?

27. Two balances are used for the same standard mass.

The best comparison is:

28. Consider the statements below:
I. All non-zero digits are significant.
II. Zeros between non-zero digits are significant.
III. Leading zeros before the first non-zero digit are significant.

29. A graph is described below.

The slope of the graph is:

30. The percentage of calcium in , using , , and , is:

31. In Dalton's atomic theory, a chemical reaction is mainly described as:

32. A student prepares of by diluting a stock solution. The volume of stock solution required is:

33. A label reports the mass of a sample as . The same mass in is:

34. A brown gas appears when a colourless solution is heated with a suitable reagent. The most careful conclusion is:

35. A claim says, "Every substance written with a chemical formula is a compound." The best correction is:

36. When adding , , and , the result should be reported to:

37. A pipette delivers in one trial. Which statement correctly gives the relative error in the delivered volume?

38. A gas-volume comparison is written below.

If of reacts completely, the volume of required is:

39. Elements A and B form two compounds. In compound P, of A combines with of B. In compound Q, of A combines with of B. The ratio of B masses for of A is:

40. Iron filings and sulphur powder are mixed in a dish without heating. A magnet can still attract the iron filings from the mixture. This shows that the sample is:

41. A sample of is kept at . Its mass is:

42. In a closed vessel, of magnesium reacts completely with oxygen to form of magnesium oxide. What mass of oxygen has combined with magnesium?

43. What is the mass of of , using molar mass ?

44. A table gives data for four binary mixtures.

The row that needs correction is:

45. Two oxides of a metal contain the following masses.

The oxygen masses are in the ratio:

46. For a compound with formula , using atomic masses , , and , the molecular mass is:

47. Assertion: The pair and can illustrate the law of multiple proportions.
Reason: For the same amount of nitrogen, the oxygen combined in is twice that in .

48. A solution is by mass in sodium chloride. The mass of sodium chloride present is:

49. A measured value of a mass is , while the accepted value is . The percentage error is:

50. A graph is described below.

The slope of the graph represents: