Advertisements
Advertisements
Question
Choose the correct answer from the option given below :
Concentrated nitric acid oxidises phosphorus to :
Options
H3PO4
P2O3
H3PO2
H4P2O7
Advertisements
Solution
H3PO4
APPEARS IN
RELATED QUESTIONS
Mention three important uses of nitric acid. Give the property of nitric acid involved in the use.
Name the Following:
Product obtained by heating concentrated nitric acid.
Give reason for the following:
Nitric acid is used in purification of gold.
What happen when (Given balanced equation) :
Nitric acid is dissolved in large amount of water?
Give two chemical tests to distinguish between dilute nitric acid and hydrochloric acid.
Why does pure nitric acid take on a yellowish brown colour when exposed to light?
X, Y and Z are three crystalline solids that are soluble in water and have a common anion.
To help you to identify X, Y and Z, you are provided with the following experimental observations. Copy and complete the corresponding inferences in (a) to (e).
- A reddish-brown gas is obtained when X, Y and Z are separately warmed with concentrated sulphuric acid and copper turning added to the mixture.
INFERENCE 1: The common anion is the ______ ion. - When X is heated, it melts and gives off only one gas which re-lights a glowing splint.
INFERENCE 2: The cation in X is either ______ or ______. - The action of heat on Y produces a reddish-brown gas and yellow residue which fuses with a glass of the test tube.
INFERENCE 3: The metal ion present in Y is the ______ ion. - When Z is heated, it leaves no residue. Warming Z with sodium hydroxide solution liberates a gas which turns moist red litmus paper blue.
INFERENCE 4: Z contains the ______ cation. - Write the equations for the following reactions:
- X and concentrated sulphuric acid (below 200°C). (One equation only for either of the cations given in INFERENCE 2)
- The action of heat on Y.
- Concentrated nitric acid is added to copper turnings kept in a beaker.
Complete the table:
| Name of Process | Inputs | Equation | Output |
| Ammonia + Air | Nitric acid |
What is the property of nitric acid which allows it to react with copper?
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.
