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Why is brown ring formed in nitrate test?

Important Questions on Study of Compounds - Nitric Acid

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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid

State one observation for the following:

Lead nitrate is heated strongly in a test tube.

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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid
Name the gas that is produced in the following case:
Action of cold and dilute nitric acid on copper.
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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid

Complete the following equation:

Cu + dil. HNO3 →

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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid

State one relevant observation for the following reactions:

  • Action of concentrated nitric acid on copper.
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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid

Which statement is not true with respect to nitrate ion test?

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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid
An inorganic Compound 'X' on treatment with concentrated H2SO4 produces brown fumes and gives dark brown ring with FeSO4 in presence of concentrated H2SO4. Also Compound 'X' gives precipitate 'Y', when its solution in dilute HCl is treated with H2S gas. The precipitate 'Y' on treatment with concentrated HNO3 followed by excess of NH4OH further gives deep blue coloured solution, Compound 'X' is:
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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid
In brown ring test for nitrate ions, brown ring is formed having composition 
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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid
Brown ring test is to detect the presence of
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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid
Metals do not form hydrogen gas, reacting with:
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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid
Hot, concentrated nitric acid reacts with sulphur to form _____.
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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid
The brown ring formed on the junction is due to the formation of
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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid
Reagent used during brown ring test of nitrate and the magnetic moment of brown ring complex formed during the reaction is:
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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid
Cold dilute nitric acid reacts with copper to form _____.
(hydrogen, nitrogen dioxide, nitric oxide).
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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid
Nitrate radical is tested by ‘brown ring test’. The brown ring is:
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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid
_____ nitric acid contains 68% HNO3 by weight. (Commercial/Lab-grade)
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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid
The brown ring test is used for the detection of
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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid
A nitrate which leaves a black residue on heating is _____.
(Write the chemical name of the nitrate.)
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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid
Nitric acid is a strong _____ agent. (oxidising / reducing)
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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid
Which of the following combines with Fe (II) ions in aqueous solution to form a brown complex?
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Science>Chemistry>Study of Compounds - Nitric Acid>Properties of Nitric Acid
Nitrate is confirmed by ring test. The brown colour of the ring is due to the formation of