Advertisements
Advertisements
प्रश्न
Give an example of a reaction where the following are involved
Pressure
उत्तर
\[\ce{N2 + 3H2 ⇌[][Above 200 atm] 2NH3}\]
APPEARS IN
संबंधित प्रश्न
Name three biochemical catalysts found in the human body.
What are oxides ?
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Compounds, which in their molten state allow an electric current to pass through them are called
- electrolytes
- non-electrolytes
- non-conductors
- none of these
TRUE \ FALSE
A precipitation reaction takes place only in a solution.
What are homogenous reactions ?
What are the characteristics of a chemical reaction ? A chemical reaction is characterised by an irreversible change in which a new substance is formed.
Fill in the blank:
The substances formed as a result of a chemical reaction are called _______
Explain the following reaction with one suitable example of Combination reactions .
Explain by writing a word equation.
Respiration is a chemical change.
What is a chemical reaction?
State the main characteristics of chemical reactions. Give at least one example in each case.
What do you observe when dilute sulphuric acid is added to the following:
Sodium Sulphide
Name the following:
The type of change physical or chemical involved – ‘during respiration in human beings’.
A chemical reaction is often accompanied by external indications or characteristics which include –
- Colour change
- Effervescence or gas evolved
- Evolution or absorption of heat
- Formation of a precipitate.
With reference to each of the above indications, state the external indication seen during – Thermal decomposition of mercury [II] oxide.
Complete the table given below.
| Heat on iodine crystals | Colour of vapours evolved |
Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.
Calcium hydroxide.
A reaction between an acid and a base is called ______.
Anaerobic bacteria digest animal waste and produce biogas (Change – A). The biogas is then burnt as fuel (Change – B). The following statements pertain to these changes. Choose the correct one.
On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.
(a) Is this a physical or a chemical change?
(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.
What is the difference between reactants and products?
