[2 Mark Questions]

Question

A reddish – brown metal A, when exposed to moist air, forms a green layer B. When A is heated at different temperatures in the presence of O2, it forms two types of oxides – C (black) and D (red). Identify A, B, C, D and write the balanced equation.

Vidyadip · Accepted Answer

(i) A reddish - brown metal A is a copper $( Cu )$.
(ii) When copper (A) is exposed to moist air it forms a green layer (B) is copper carbonate.
$2 Cu + O _2+ CO _2+ H _2 O \longrightarrow CuCO _3 \cdot Cu ( OH )_2$
Copper carbonate (B)
(iii) When copper is heated at different temperature in the presence of oxygen, it forms two types of oxides $CuO$ and $Cu _2 O$. ( $C$ and $\left.D \right)$
$2 Cu + O _2 \frac{\text { below } 1370 K }{\Delta} 2 CuO$
$\text { SamacheerKalvi.Guru }$
$\text { Copper (II) oxide (C) }$
$\text { (Black) }$
$4 Cu + O _2 \frac{\text { above } 1370 K }{\Delta} \quad 2 Cu _2 O$
Copper (I) oxide (D) (Red)cellpadding="0">

A	Copper	Cu
B	Copper carbonate	CuCO_(3)*Cu(OH)_(2)
C	Copper (II) oxide-black	CuO
D	Copper (I) oxide-red	Cu_(2)O

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