Question

a compound A is green in colour on heating it gives a gas B which turns limewater milky. the residue left C is black in colour identify A B and C write the chemical reaction involved.

Answer 1

A is CuCO3
B is CO2
C is CuO
CuCO3 ==> CuO + CO2
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Answer 2

Identification of compounds A, B, and C.

Explanation:

• Based on the colour of compound A, it is inferred as Copper carbonate and its chemical formula is $CuCO_3$.
• When calcium carbonate is heated the following chemical reaction occurs:

$CuCO_3\stackrel{\Delta}{\rightarrow}CO_2+CuO$

• The gas which is obtained in this reaction is carbon dioxide. It turns the lime water into milky.
• The residue which is left is Copper oxide (CuO) is black and thus it is inferred as compound C.
• Thus from the above data, the compounds A, B, and C are identified as:

1. Compound A - Copper carbonate ($CuCO_3$)
2. Compound B - Carbon dioxide $(CO_2)$
3. Compound C - Copper oxide (CuO)

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A organic compound A on heating with conc.H2SO4 forms a compound B which on addition of one mole of hydrogen in presence of NI forms a compound C . One mole of compound C on combustion forms two mole of Co2 and 3 mole of H2O . Identify A B C and write chemical equation of each reaction.

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Identify the compound X on the basis of the reactions given below.

Also, write the name and chemical formulae ofA, B and C.

+ Zn--> A + H2(g)

X + HCl ----> B + H2O

+ CH3COOH------------> C + H2O

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