Question

So ‘A’ is CaO and 'B' is Ca(OH)2.
Ca(OH)2 (aq) + CO2(g)
CaCO3(s) + H2O(l)
Calcium carbonate
(White ppt.)
'C' is CaCO3
On heating blue coloured powder of copper (II) nitrate in a boiling tube, cop
oxygen gas and a brown gas X is formed.
(a) Write a balanced chemical equation of the reaction.
(6) Identify the brown gas X evolved.
(c) Identify the type of reaction.
(d) What could be the pH range of aqueous solution of the gas X?
(a) 2Cu(NO3)2(5)
Heat , 2CuO(s) + O2(g) + 4NO2(g)
(6) The brown gas X evolved is nitrogen dioxide (NO2).
(c) This is a decomposition reaction.
(d) Nitrogen dioxide dissolves in water to form acidic solution because
itol Therefore, pH of this solution is less than 7.
tonn aqueous solution​

Answer 1

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