JEE Chemistry Online Test Some Basic Concepts Of Chemistry Set F

1. Assertion : Significant figures for 0.200 is 3 whereas for 200 it is 1.
Reason : Zero at the end or right of a number are significant provided they are not on the right side of the decimal point

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3. Match the mass of elements given in Column I with the number of moles given in Column II and mark the appropriate choice. Choose the correct codes formt he options given below.

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7. Match the columns

8. Match the items of Column I, II and III appropriately and choose the correct option from the codes given below

9. Choose the correct option based on following statements. Here ‘T’ stands for true and ‘F’ stands for false statement.
(i) Molecular mass of cane sugar (C₁₂H₂₂O₁₁) is 182 amu.
(ii) 1 mole of cane sugar contains 6.022 × 10²³ molecules of cane sugar.
(iii) 34.20 g of cane sugar contains 6.022 × 10²¹ molecules of cane sugar

10. Consider the following statements.
(i) Atoms of H, O, N and C have identical properties but different mass.
(ii) Matter is divisible into atoms which are further indivisible.
(iii) The ratio of N: H in NH3 is 1 : 3 and N : O in nitric oxide is 2 : 1.
(iv) Dalton’s atomic theory support law of conservation of mass. Which of the following pairs of statements is true according to Dalton’s atomic theory ?

11. Give the correct order of initials T or F for following statements. Use T if statement is true and F if it is false.
(i) Gay-Lussac’s law of gaseous volumes is actually the law of definite proportion by volume.
(ii) Law of conservation of mass is true for physical change, but not for chemical change.
(iii) The percentage of oxygen in H₂O₂ is different from that in H₂O. Hence, it violates law of definite proportions.
(iv) Fixed mass of A reacts with two different masses of B (say x and y), then the ratio of x/y can be any positive integer.
(v) At STP, 5 mL of N2 and H2 have different no. of molecules.

12. Moon takes 27.3 days to complete one orbit around the
Earth. Now read the following statements and choose the correct code. Here T is for true statement and F is for ‘False statement’.
(i) Moon takes 655.2 hours to complete one orbit around the Earth.
(ii) Moon takes 39312 seconds to complete one orbit around the earth.
(iii) Moon takes 1638 minutes to complete one orbit around the Earth

13. Read the following and choose the incorrect statements.
(i) Both weight and mass are same quantities used for measurement of amount of matter present in a substance
(ii) Mass and weight of a substance vary from one place to another due to change in gravity.
(iii) SI unit of mass is kilogram and while SI unit of weight is gram.

14. Choose correct option based on following statements. Here T stands for true statement and F for false statement.
(i) Homogeneous mixture has uniform composition throughout.
(ii) All components of a heterogeneous mixture are observable to naked eyes.
(iii) All solutions are homogeneous in nature.
(iv) Air is an example of heterogeneous mixture.

15. Which of the following statements are correct ? (i) Both solids and liquids have definite volume.
(ii) Both liquids and gases do not have definite shape.
(iii) Both solids and gases take the shape of the container

16. Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 ml of 1.5 M first solution + 520 ml of 1.2 M second solution. What is the molarity of the final mixture?

17. 6.02 × 10²⁰ molecules of urea are present in 100 ml of its solution. The concentration of urea solution is

18. With increase of temperature, which of these changes?

19. A 5 molar solution of H₂SO₄ is diluted from 1 litre to a volume of 10 litres, the normality of the solution will be