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A shiny brown coloured element ‘X’ on he...

A shiny brown coloured element ‘X’ on heating in air becomes black in colour. Name the element ‘X’ and the black coloured compound formed

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'X' is copper (Cu) and the black-coloured compound formed is copper oxide (CuO). The equation of the reaction involved on heating copper is given below
`underset(("Shiny Brown in Colour"))(2Cu)+O2overset("Heat")(rarr)underset(("Black in Colour"))(2CuO)`.
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NCERT ENGLISH-CHEMICAL REACTIONS AND EQUATIONS-Exercise
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  6. Balance the following chemical equations.

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  9. What does one mean by exothermic and endothermic reactions? Give examp...

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  10. Why is respiration considered an exothermic reaction? Explain.

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  12. Write one equation each for decomposition reactions where energy is su...

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  17. A shiny brown coloured element ‘X’ on heating in air becomes black in ...

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