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 – pink
In the course of purifying water for town supply the water is passed through large settlings tanks: containing sodium aluminate (III) to remove?
A. large particles B. germs C. fine particles D. odour Correct Answer: Option A – large particles
Air boiled out of water as steam is richer in?
A. nitrogen and oxygen B. carbon (IV) oxide and oxygen C. noble gases and carbon (IV) oxide D. oxygen and noble gases Correct Answer: Option B – carbon (IV) oxide and oxygenProducts
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