question_answer 94)

  Of the three metals X, Y and Z, X reacts with cold water, Y with hot water and Z with steam only. Identify X, Y and Z and also arrange the min order of increasing reactivity.               

Answer:

                  X is sodium or potassium (Na or K) as it reacts with cold water.                 Y is magnesium (Mg) as it reacts with hot water. Z is iron (Fe). Increasing order of reactivity                 or