Q44 of 152 Page 21

One of the following is an exothermic reaction. This is:

Respiration is exothermic reaction in which oxygen is consumed and heat is produced.

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42 One of the following is an endothermic reaction. This is: 43 Which of the following is not an endothermic reaction? 45 The chemical equations are balanced to satisfy one of the following laws in chemical reactions. This law is known as: 46 When the solution of substance X is added to a solution of potassium iodide, then a yellow solid separates out from the solution.

(a) What do you think substance X is likely to be?


(b) Name the substance which the yellow solid consists of.


(c) Which characteristic of chemical reactions is illustrated by this example ?


(d) Write a balanced chemical equation for the reaction which takes place. Mention the physical states of all the reactants and products involved in the chemical equation.