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Some reactions of two ores, A 1 and A 2 of the metal M are given below. (see attachement) Identify A 1 , A 2 , M, C, D, and G, and explain using the required chemical reactions.

Some reactions of two ores, A1 and A2 of the metal M are given below.
(see attachement)
Identify A1, A2, M, C, D, and G, and explain using the required chemical reactions.
 

Question Image
Grade:10

1 Answers

Jitender Pal
askIITians Faculty 365 Points
7 years ago
Hello Student,
Please find the answer to your question
Calcinations of the ore A1 to form CO2 indicates that A1 should be a carbonate. Further, reaction of A1 with HCI and KI to evolve I2 indicates that A­1 would also be hydroxide. So the possible formula for the ore, should be CuCO3.Cu(OH)2 which explains all the given reactions
CuCO3.Cu(OH)2 \overset{calci nation}{\rightarrow}2CuO ↓ +CO2 + H2O
(A1) (C) black
CuCO3.Cu(OH)2 + 4HCI → 2CuCI2 + CO2 + 3H2O
(A1)
2CuCI2 + 4KI → Cu2 ↓ + 4KCI + I2
(D)
Roasting of A2 gives gas G whose nature is identified as SO2 as it gives green colour with acidified K2Cr2O7. So A2 should be sulphide of copper.
2Cu2S + 3O2 \overset{roasting}{\rightarrow}2Cu2O + 2SO2
(A2) (G)
Cu2S + 2Cu2O \overset{self reduction}{\rightarrow}6Cu+SO2
(M)
3SO2 + K2Cr2O7 + H2SO4 → K2SO4 + Cr2(SO4)3 + 4H2O
(G) (Green colour)

Thanks
jitender
askIITians Faculty

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