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General Principles and processes of Isolation of Elements
hard
Pb and Sn are extracted from their chief ore by
A
Carbon reduction and self reduction.
B
Self reduction and carbon reduction.
C
Electrolysis and self reduction.
D
Self reduction and electrolysis.
(IIT-2004)
Solution
(b)$PbO$ & $PbS{O_4}$ get reduced by $PbS$ itself which is already present in mixture so because the reduction took place by mixture itself, hence is known as self reduction.
$2PbO + PbS \xrightarrow{\Delta} 3Pb + S{O_2} \uparrow $
$PbS{O_4} + PbS \xrightarrow{\Delta} 2Pb + 2S{O_2} \uparrow $
Standard 12
Chemistry
Similar Questions
Match List $I$ with List $II.$
| List $I$ | List $II$ |
| $A.$ Siderite | $I.$ $Fe CO _{3}$ |
| $B.$ Malachite | $II.$ $CuCO _{3} \cdot Cu ( OH )_{2}$ |
| $C.$ Sphalerite | $III.$ $ZnS$ |
| $D.$ Calamine | $IV.$ $ZnCO _{3}$ |
Choose the correct answer from the options given below
