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प्रश्न
The action of heat on the blue crystalline solid X gives a reddish brown gas Y, a gas which re-lights a glowing splint and leaves a black residue. When gas Z, which has a rotten egg smell, is passed through a solution of X, a black ppt. is formed.
- Identify X, Y and Z.
- Write the equation for the action of heat on X.
- Write the equation between solution X and gas Z.
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उत्तर
a. X is copper nitrate [Cu(NO3)2].
Y is nitrogen dioxide [NO2].
Z is hydrogen sulphide [H2S].
b. \[\ce{\underset{Blue crystalline}{2Cu(NO3)2} ->[heat] \underset{Black}{2CuO} + 4NO2 + O2}\]
c. When a H2S gas, which has a rotten egg smell, is passed through a solution of Cu(NO3)2, a black ppt. of CuS is formed.
\[\ce{Cu(NO3)2 + H2S ->CuS + 2HNO3}\]
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संबंधित प्रश्न
Write a balanced equation for the action of heat on a mixture of copper and concentrated nitric acid.
Ammonia is used in the Ostwald process.
Name the catalyst used in the process.
Give the chemical name and formula of the substance formed as a brown ring in the test for nitrate radical.
The nitrate salt which does not give a mixture of NO2 and O2 on heating is ______.
The chemical used in the brown ring test is ______.
Brown ring disappear if the test tube is disturbed.
Give reason for the following:
Nitric acid is used in purification of gold.
Give reason for the following:
Lighting is a blessing in disguise.
Explain the following :
An all glass apparatus is used in the laboratory preparation of nitric acid.
A dilute acid B does not normally give hydrogen when reacted with metals but does give a gas when it reacts with copper. Identify B. Write the equation with copper.
