Advertisements
Advertisements
Question
Give reason for the following:
Nitric acid is used in purification of gold.
Advertisements
Solution
Nitric acid is used in the purification of gold because impurities of other metals are dissolved in it.
APPEARS IN
RELATED QUESTIONS
Ammonia is used in the Ostwald process.
Name the oxidising agent used in this process.
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.
What happens when (Given balanced equation) :
Sulphar is added to hot and conc. HNO3?
Write balanced equation for the preparation of nitric acid from potassium nitrate.
Give reason for the following:
Commercial concentrated nitric acid is yellow in colour, but when it is dilute with water, it turns colourless.
Give one chemical test for nitric acid.
What do you see when concentrated nitric acid is added to copper?
Explain, why only all glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate.
Write the equation for the reaction:
Aluminum, Nitride and Water.
Copy and complete the following table relating to important industrial processes output refers to the product of the process not the intermediate steps.
| Name of process | Inputs | Catalyst | Equation for catalysed reaction | Output |
| Haber process | Hydrogen + | |||
|
Ammonia + |
Nitric acid |
From the following list of substances, choose one substance in the case which matches the description given below:
Ammonium nitrate, calcium hydrogen carbonate, copper carbonate, lead nitrate, potassium nitrate, sodium carbonate, sodium hydrogen carbonate, zinc carbonate.
A Substance that gives off only oxygen when heated.
