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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.
 

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Grade:10

1 Answers

Jitender Pal
askIITians Faculty 365 Points
10 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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