If the solubility of KHCO3 is 0.40 mole dm‾³ at room temperature, calculate the mass of KHCO3 in 100dm³ of the solution at this temperature. [KHCO3 = 100gmol]
A. 4.0g B. 10.0g C. 40.0g D. 100.0g Correct Answer: Option A – 4.0g
Which of the following compounds dissolves in water to form a solution with pH below 7?
A. Sodium tetraoxosulphate (VI) B. Potassium hydroxide C. Ammonium chloride D. Sodium trioxocarbonate (IV) Correct Answer: Option C – Ammonium chloride
Which of the following is an acid salt?
A. NH4CI B. MgSO4.7H2O C. CH3COONa D. NaHCO3 Correct Answer: Option D – NaHCO3
An exothermic reaction is one which involves?
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 Correct Answer: Option B – loss of heat to the surroundingProducts
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