The uncovered raw food that is sold along major roads is likely to contain some amounts of?
A. Pb B. Cu C. Ag D. Na Correct Answer: Option A – Pb
117.0g of sodium chloride was dissolved in the solubility in 1.0dm³ of distilled water at 25°C. Determine the solubility in mol dm-³ of sodium chloride at that temperature [Na = 23, Cl = 35.5]
A. 1.0 B. 2.0 C. 3.0 D. 4.0 Correct Answer: Option B – 2.0 Explanation Relative molecular mass of NaCl = 23 + 35.5 = 55.5 g/mol No. of mole of NaCl = 117/55.5 = 2.1 mol
The vulcanizer’s solution is prepared by dissolving rubber in?
A. ethanol B. kerosine C. benzene D. petrol Correct Answer: Option C – benzene
When a few drops of water is added to a blue anhydrous cobalt (II) chloride; the colour changes to?
A. white B. pink C. red D. blue Correct Answer: Option B – pinkProducts
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