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प्रश्न
When concentrated 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 added to this test tube. On cooling, the gas (A) changed into a colourless solid (B).
1) Identify (A) and (B).
2) Write the structures of (A) and (B).
3) Why does gas (A) change to solid on cooling?
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उत्तर
1) A = NO2 ; B = N2O4
2)
3) It converts into solid because of NO2 form dimer i.e N2O4 at low temperature.
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संबंधित प्रश्न
Complete the following equations: C + conc. H2SO4 →
Draw the structure of the following:
H2SO4
Why is `K_(a_2) "<<" K_(a_1)` for `H_2SO_4` in water?
Write structure and molecular formula for the following compounds:
a. Orthophosphoric acid
b. Sulphurous acid
Write the formula for pentaamminechlorocobalt (III) sulphate.
Which of the following reaction is NOT involved in contact process used for manufacturing sulfuric acid?
The sulfuric acid obtained by contact process is ____________ % pure.
In the manufacture of sulphuric acid by contact process Tyndall box is used to ____________.
Hot conc. \[\ce{H2SO4}\] acts as the moderately strong oxidising agent. It oxidises both metals and non-metals. Which of the following element is oxidised by conc. \[\ce{H2SO4}\] into two gaseous products?
Which of the following statements are correct?
(i) S – S bond is present in \[\ce{H2S2O6}\].
(ii) In peroxosulphuric acid \[\ce{(H2SO5)}\] sulphur is in +6 oxidation state.
(iii) Iron powder along with \[\ce{Al2O3}\] and \[\ce{K2O}\] is used as a catalyst in the preparation of \[\ce{NH3}\] by Haber’s process.
(iv) Change in enthalpy is positive for the preparation of \[\ce{SO3}\] by catalytic oxidation of \[\ce{SO2}\].
