Advertisements
Advertisements
Question
Cold, dilute nitric acid reacts with copper to give ______.
Options
Sulphur dioxide
Nitrogen dioxide
Nitric oxide
Sulphuric acid
Hydrogen
Advertisements
Solution
Cold, dilute nitric acid reacts with copper to give nitric oxide.
Explanation:
Cold, dilute nitric acid acts as an oxidizing agent and reacts with copper to form copper nitrate, water, and nitric oxide gas (NO).
\[\ce{3Cu + 8HNO3(dil{.} -> 3Cu(NO3)2 + 2NO + 4H2O)}\]
The nitric oxide formed is colourless, but on exposure to air it gets oxidised to reddish-brown nitrogen dioxide (NO2).
APPEARS IN
RELATED QUESTIONS
Fill in the blanks using the appropriate words given below :
(Sulphur dioxide, nitrogen dioxide, Nitric oxide, Sulphuric acid)
Hot, concentrated nitric acid reacts with sulphur to form ______________.
What is aqua fortis?
What is the fixation of Nitrogen?
During thunderstorm, rain water contains nitric acid. Explain with reactions.
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.
Write the balanced equation for the following:
Action of concentrated nitric acid on copper.
Write the balanced equation for the following:
Action of heat on AgNO3
Write a balanced equation for following :
Action of conc. Nitric acid on sulphur
What happens when
Caustic soda solution is added to Cu(NO3)2 solution and product boiled.
From the formulae listed below, Choose, one, corresponding to the salt having the given description:
AgCl, CuCO3, CuSO4.5H2O, KNO3, NaCl, NaHSO4, Pb(NO3)2, ZnCO3, ZnSO4, 7H2O.
On heating this, salt changes from green to black.
