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प्रश्न
State one relevant observation for the following:
When crystals of copper nitrate are heated in a test tube.
State one observation:
Copper nitrate crystals are heated in a test tube.
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उत्तर
On heating, the greenish-blue copper nitrate crystals decompose to form a black copper(II) oxide residue, and reddish-brown nitrogen dioxide gas is evolved.
संबंधित प्रश्न
Give a balanced chemical equation for Action of conc. Nitric acid on Sulphur
Name the gas that is produced in the given cases :
Sulphur is oxidized by concentrated nitric acid.
What is aqua fortis?
During thunderstorm, rain water contains nitric acid. Explain with reactions.
- Write a balanced chemical equation for the laboratory preparation of nitric acid.
- In the preparation of nitric acid from KNO3, concentrated hydrochloric acid is not used in place of concentrated sulphuric acid. Explain why?
- Conc. nitric acid prepared in the laboratory is yellow in colour. Why? How is this colour removed?
- Give reasons for the following:
In the laboratory preparation of nitric acid, the mixture of concentrated sulphuric acid and sodium nitrate should not be heated very strongly above 200°C.
Nitric acid cannot be concentrated beyond 68% by the distillation of a dilute solution of HNO3. State the reason.
Identify the substance underlined:
The dilute acid which is an oxidizing agent.
The following statement is correct only under certain conditions. Rewrite the statement including the appropriate condition(s) and underline it in your answer.
Copper and nitric acid react together to produce nitrogen dioxide.
Write balanced equation to show the reaction between the sulphur and hot concentrated nitric acid.
Fill in the blank using the appropriate words given below:
Cold, dilute nitric acid reacts with copper to give ______.
