question_answer 37)

    Solid calcium oxide reacts vigorously with water to form calcium hydroxide companied by liberation of heat. This process is called slaking of lime. Calcium hydroxide dissolves in water to form its solution called limewater. Which among the following is are true about slaking of lime and the solution formed? (i) It is an endothermic reaction. (ii) It is exothermic reaction. (iii)The pH of the resulting solution will be more than seven. (iv) The pH of the resulting solution will be less than seven. (a) (i) and (ii)                      (b) (ii) and (iii)                    (c) (i) and (iv)                     (d) (iii) and (iv)

Answer:

  (b) It is an exothermic reaction because heat is given out and the resulting compound iswhich is basic in nature so, the pH of the resulting solution will be more than seven. turns red litmus solution to blue. So, its pH value is greater than seven.