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When conc. sulphuric acid was added to an unknown salt present in a test tube, a brown gas (A) was evolved. This gas intensified when copper turnings were also added into this tube. On cooling, the gas ‘A’ changed into a colourless gas ‘B’. (a) Identify the gases A and B. (b) Write the equations for the reactions involved.

When conc. sulphuric acid was added to an unknown salt present in a test tube, a
brown gas (A) was evolved. This gas intensified when copper turnings were also
added into this tube. On cooling, the gas ‘A’ changed into a colourless gas ‘B’.
(a) Identify the gases A and B.
(b) Write the equations for the reactions involved.

Grade:upto college level

2 Answers

shrey
12 Points
10 years ago
A is pb(no3)2 B is n2o4 pb(no3)2-->2pbo+ 4no2+o2 2no2--- cooling---> n2o4(colourless)
MESHACK MBITHI
13 Points
5 years ago
A IS NO2 WHILE B IS N2O4

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