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प्रश्न
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
Are these changes chemical in nature?
उत्तर
Yes, the changes are chemical changes because new substances iron sulphate (green) and copper (brown) are formed in the reaction.
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संबंधित प्रश्न
Give reason for the following:
Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.
Name the following:
The type of change physical or chemical involved – ‘during respiration in human beings’.
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Lead nitrate.
______ is not a chemical change.
Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.
Which of the following are chemical changes?
(i) Decaying of wood
(ii) Burning of wood
(iii) Sawing of wood
(iv) Hammering of a nail into a piece of wood
The chemical formula of rust is ______.
How would you show that the settling of curd is a chemical change?
Give an example where heat, light, and sound are produced during a chemical change.
______ is a chemical substance is used in whitewashing.
