Advertisements
Advertisements
प्रश्न
What is meant by the following term?
Decrepitation
Advertisements
उत्तर
It is the breaking of a substance usually accompanied by the emission of a crackling sound. An example of a substance that decomposes on heating is Lead nitrate, Pb(NO3)2.
APPEARS IN
संबंधित प्रश्न
The chemical used in the brown ring test is ______.
Name the catalyst used in Ostwald process.
What happen when (Given balanced equation):
Nitric acid is added to washing soda and the resulting gas is passed through a freshly prepared lime water?
Choose the correct answer from the option given below :
Concentrated nitric acid oxidises phosphorus to :
Fill in the blank with appropriate word/words.
Ammonal is a mixture of ________ and __________
Describe what you see when concentrated nitric acid is added to copper.
Write the equation for the laboratory preparation of nitric acid from potassium nitrate and concentrated sulphuric acid.
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?
