A shiny brown coloured element 'X' on heating in air becomes black in colour. Name the element 'X' , the black coloured compound formed and the reaction. [3 MARKS]

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Solution

Each point: 1 Mark

An element on heating in air changes into its oxide. The brownish element which forms black oxide is copper. So,

1. The element name is copper (Cu)

2. The black compound is copper(II) oxide, (CuO)

3. Reaction: $2 Cu(s) + O_{2} (g) \to 2 CuO (s)$

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A shiny brown coloured element 'X' on heating in air becomes black in colour. Name the element 'X' , the black coloured compound formed and the reaction. [3 MARKS]

Each point: 1 Mark An element on heating in air changes into its oxide. The brownish element which forms black oxide is copper. So, 1. The element name is copper (Cu) 2. The black compound is copper(II) oxide, (CuO) 3. Reaction: 2Cu(s)+O2(g)→2CuO(s)

Each point: 1 Mark

An element on heating in air changes into its oxide. The brownish element which forms black oxide is copper. So,

1. The element name is copper (Cu)

2. The black compound is copper(II) oxide, (CuO)

3. Reaction: $2 Cu(s) + O_{2} (g) \to 2 CuO (s)$