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Why does the color of copper sulphate solution change when an iron nail is dipped in it?

Asked by Nagesh 07/12/2017 Last Modified 02/02/2018

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Why do we apply paint on iron articles?

When iron comes in contact with atmospheric air, it gets corroded or rusted. A reddish brown colour is deposited on its surface called a s rust; which damaged the iron article. Hence, to prevent such rusting we apply paint the iron articles.

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What is potential difference? Give its unit with definition.

Potential difference is the difference in the amount of potential energy a particle has due to its position between two locations in an electric field. SI unit=volt

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What is resistance of conductors? Name two metals which are highly resistant.

It is a property of a conductor which opposes the flow of charges through them and two metals which are highly resistant (i) gold and (ii) platinum

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Suggest some good reference books for CBSE Class IX Mathematics and General Science (Physics, Chemistry & Biology).

Mathematics by R.S. Agrawal' Physics, Chemistry and Biology by S. Chand publications will be good.

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What are best books for science and maths to refer for std 10th state board?

Maths: Everyone suggests RD Sharma, but personally, I found RS Aggrawal more helpful. (Maybe because I never had the courage to solve RD because of its size.) Be sure to go through all the questions of...

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