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A shiny brown -coloured elemnt 'X' on he...

A shiny brown -coloured elemnt '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 is copper oxide (CuO) The equation of the reaction involved on heating copper is given below.
`2Cu+O_(2) overset("Heat") to 2CuO`
(shiny brown in colour)(black in colour)
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CPC CAMBRIDGE PUBLICATION-CHEMICAL REACTIONS AND EQUATIONS-Exercise
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  9. Why is respiration considered an exothermic reaction ? Explain.

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  10. Why are decomposition reactions called the opposite of combination rea...

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  11. Write one equation for decomposition reactions where energy is supplie...

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  12. What is the difference between displacement and double displacement re...

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  16. A shiny brown -coloured elemnt 'X' on heating in air becomes black in ...

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