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Chemistry Past Questions and Answers

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Chemistry Questions

Question 2571:

An exothermic reaction is one which involves

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A Attainment of dynamic equilibrium
B Loss of heat to the surrounding
C Evolution of gas as it proceeds
D Positive change in value of enthalpy

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Question 2572:

Which of the following is an acid salt?

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A NH<sub style='font-size: smaller;'>4</sub>CI
B MgSO<sub style='font-size: smaller;'>4</sub> 7H<sub style='font-size: smaller;'>2</sub>O
C CH<sub style='font-size: smaller;'>3</sub>COONa
D NaHCO<sub style='font-size: smaller;'>3</sub>

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Question 2573:

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

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A Sodium tetraoxosulphate (VI)
B Potassium hydroxide
C Ammonium chloride
D Sodium trioxocarbonate (IV)

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Question 2574:

If the solubility of KHCO<sub style='font-size: smaller;'>3</sub> is 0.40 mole dm<sup style='font-size: smaller;'>-3 at room temperature , calculate the mass of KHCO<sub style='font-size: smaller;'>3</sub> in 100dm^{3</sup> of the solution at this temperature. [KHCO<sub style='font-size: smaller;'>3</sub> = 100hmol]<br/>}

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A 4.0g
B 10.0g
C 40.0g
D 100.0g

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Question 2575:

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

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A Ionic
B Deliquescent
C A strong electrolyte
D A normal salt

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