A student took a small piece of solid quick lime in a china dish and poured over it a
small amount of water. List two changes he is likely to observe in the china dish
immediately after pouring water.

A student takes a mixture of sand and ammonium chloride in a china dish and heats it under a funnel fitted with a plug over a flame. He would observe that :

A small amount of quick lime is taken in a beaker. Water is add slowly to beaker. What is the observation wre noted?

A student dropped a few pieces of marble in dilute hydrochloric acid contained in a test tube. The evolved gas was passed through lime water. What change would be observed in lime water? Write the balanced chemical equations for both the change observed?

A student puts his pencil into an empty trough and observes the pencil from the position as indicated in Figure. (i) What change will be observed in the appearance of the pencil when water is poured into the trough? (ii) Name the phenomenon which accounts for the above stated observation. (iii) Complete the diagram showing how the student's eye sees the pencil through water.

(a) A student dropped a few pieces of marble in dilute hydrochloric acid contained in a test tube. The evolved gas was passed through lime water. What change would be observed in lime water ? Write balanced chemical equations for both the changes observed. (b) State the chemical property in each case on which the following uses of baking soda are based: (i) as an antacid (ii) as a constituent of baking powder.

(a) A student dropped a few pieces of marble in dilute hydrochloric acid contained in a test tube. The evolved gas was passed through lime water. What changes would be observed in lime water ? Write balanced chemical equations for both the changes observed. (b) State the chemical property in each case on which the following uses of baking soda are based: (i) as an antacid (ii) as a constituent of baking powder.