When a sample of water was boiled, it lathered more readily with soap. it can be concluded that the sample most likely contained?
A. magnesium tetraoxosulphate (VI) B. suspended solids C. Organic impurities D. calcium hydrogentrioxocarbonate (IV) Correct Answer: Option D D. calcium hydrogentrioxocarbonate (IV)What is the main impurity in haematite?
A. CaSiO3 B. CaCO3 C. SiO3 D. Fe2O3 Correct Answer: Option C C. SiO3Which of the following compound is used for removing impurities from bauxite?
A. NaOH B. CaCO3 C. Na3AIF6 D. H2SO4 Correct Answer: Option A A. NaOHWhat volume of 0.20 mol dm‾³ NaOH solution would yield 5.0g of NaOH on evaporation to dryness? [NaOH = 40g mol‾¹]
A. 400 cm³ B. 625 cm³ C. 1000 cm³ D. 1600 cm³ Correct Answer: Option B B. 625 cm³ Explanation Conc. g/dm³ = 0.20 x 40 gmol -1 = 8 g/dm³ 1000 cm³ of 0.20m NaOH contains 8g of NaOH :. 5g of NaOH will be contained in 5/8 x 1000 x...Products
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