30. The solubility of potassium chloride at 20°C is 34.7 g in 100 g of water. The density of the solution is 1.3 g mL–1. What is he w/V percentage of potassium chloride in the solution?
(A) 25.76 (B) 32.98 (C) 33.49 (D) 22.56
31. What will be the number of aluminium ions in 0.051 g of aluminium oxide?
(A) 5.0 × 10–4 ions (B) 6.0 × 1023 ions (C) 12 × 1023 ions (D) 6.0 × 1020 ions
32. An ion M 2 + contains 10 electrons and 12 neutrons. What is the atomic number and mass number of element M?
(A) 10, 24 (B) 10, 22 (C) 12, 24 (D) 12, 22
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Please find below the link of a similar query as asked by you:
https://www.meritnation.com/ask-answer/question/what-will-be-the-number-of-aluminum-ions-in-0-051-g-of-alumi/atoms-and-molecules/9755289
https://www.meritnation.com/ask-answer/question/9-72g-of-potassium-chloride-dissolve-in30g-of-water-at-27deg/is-matter-around-us-pure/9923470
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