Which of the following lowers the activation energy of a chemical reaction?

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Which of the following compounds dissolves in water to form a solution with pH below 7?

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The property of calcium chloride which makes it useful as a drying agent is that it is

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If the solubility of KHCO3 is 0.40 mole dm-3

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Which of the following is an acid salt?

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An exothermic reaction is one which involves

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Calculate the total volume of the gaseous mixture at the end of the reaction

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Helium is preferred to hydrogen in filling balloons because hydrogen

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What volume of hydrogen is produced at s.t.p. When 2.60 g of zinc reacts with excess HCI according to the fo llowing equation? Zn(s) + 2HCI(aq) → ZnCI 2(aq) + H2(g ) Zn = 65; 1 mole of a gas occupies 22.4dm3 at s.t.p

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Gas molecules are said to be perfectly elastic because

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Equal volumes of CO2 cnd CO at s.t.p have the same

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Which of the following movements can be described as random motion?

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