An orange colored salt ‘A’ on heating erupts in the form of volcano to
form compound ‘B’ and two gases C’ and ‘D’. ‘D’ if allowed to collect can be
condensed to a colourless liquid. (2+2+1)
i) Identify A, B, C and D.
ii) Give balanced chemical equation.
iii) What is the colour of ‘B’?
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Answer
Correct option is
A
CaCO
3
The reactions can be summarized as follows :
A
→
Δ
colorless gas + residue
residue + H
2
O → B
→
ExcessCO
2
C
→
Δ
A
This is possible only when A is CaCO
3
. The reactions are as follows
CaCO
3
→
Δ
(colourlessgas)
CO
2
+
(residue)
CaO
CaO+ H
2
O →
(B)
Ca(OH)
2
CO
2
(excess)
(C)
Ca(HCO
3
)
2
→
Δ
CaCO
3
Thus, calcium carbonate on heating gives colourless gas carbon dioxide and residue calcium oxide. Calcium oxide reacts with water to form calcium hydroxide. Calcium hydroxide reacts with excess carbon dioxide to form calcium hydrogen carbonate. This on heating gives calcium carbonate.
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