Question

Q.20 (a) Give one example of a chemical reaction.
(b) State two characteristics of the chemical reaction which takes place when dilute sulphuric
acid is poured over zinc granules.
(c) Give two characteristics of the chemical reaction occurs on adding potassium iodide
solution to lead nitrate solution ?​

Answer 1

a) For ex - iron and oxygen combining to make rust , vinegar and baking soda combining to make sodium acetate , carbon dioxide and water .

b) change in temperature and evaluation of hydrogen gas .

c) on adding potassium iodide solution to lead nitrate solution , yellow percipitates of lead iodide are formed and the colour of the solution changes from colourless to yellow . Hence 'formation of a percipitates' and 'change in colour' characteristics of the chemical reaction

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