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CBSE Class 10 Science Question 17 of 28

Chemical Reactions and Equations — Question 17

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Question 17

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

Answer

Element 'X ' is copper. On heating in air it forms Copper (II) oxide, which is black in colour.

2Cu (s) + O2 (g) →Heat\xrightarrow{\text{Heat}} 2CuO (s)