Question

Upon heating with $C{u}_{2}S.$ the reagent(s) that give copper metal is/are

• A. $CuFe{S}_2$
• B. $CuO$
• C. $C{u}_{2}O$
• D. $CuS{O}_4$

Answer 1

Answer: (B), (C), (D)

(A) $2CuFe{S}_2+O_2\stackrel{\Delta }{\to }C{u}_{2}S+2FeS+S{O}_2$
(B) $4CuO\stackrel{1100^{\circ }C}{\to }2C{u}_{2}O+O_2$
$2C{u}_{2}O+C{u}_{2}S\stackrel{\Delta }{\to }6Cu+S{O}_2$
(C) $C{u}_{2}S+2C{u}_{2}O\stackrel{\Delta }{\to }6Cu+S{O}_2$
(D) $CuS{O}_4\stackrel{720^{\circ }C}{\to }CuO+S{O}_2+\frac{1}{2}{O}_2$
$4CuO\stackrel{1100^{\circ }C}{\to }2C{u}_{2}O+O_2$
$2C{u}_{2}O+C{u}_{2}S\stackrel{△}{\to }6Cu+S{O}_2$