Advertisements
Advertisements
प्रश्न
Name the type of chemical reaction shown by the following equation :
Fe2O3 + 2Al → Al2O3 + 2Fe
Advertisements
उत्तर
Fe2O3 + 2Al → Al2O3 + 2Fe => Displacement reaction.
APPEARS IN
संबंधित प्रश्न
Complete and balance the following chemical equations
Na + H2 O →
Fill in the blank.
Melting of ice is a _______ change.
Fill in the blank
A change in which the substance can be brought back to its original state is called a _______ change.
Write true or false .
A black residue is formed when sugar is heated .
Write true or false.
A chemical equation gives only qualitative information of a chemical reaction.
Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
The conversion of ferrous sulphate to ferric sulphate is ______ reaction.
What do you understand by precipitation reaction? Explain with examples.
State the type of reactions for the following represent and balance the ones that are not balanced.
Cl2 + 2KBr → 2KCl + Br2
What is a chemical change? Give two examples of chemical change?
State the original colour of the following substance and colour of residue obtained after heating.
Lead nitrate
What do you observe when Cobalt chloride paper is introduced in water vapour.
Give a chemical test to distinguish between the following gases.
H2 and CO2
What do you observe when CO2 is passed through lime water first and then a little in excess.
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.
Explain the term chemical reaction with special reference to reactants and products.
Circle the odd one out. Give reason for your choice
Higher order Thinking question
A very hot glass on putting in cold water cracks. What does this change indicate?
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.
Classify each of the following, as a physical or a chemical change. Give reasons.
(a) Drying of a shirt in the sun.
(b) Rising of hot air over a radiator.
(c) Burning of kerosene in a lantern.
(d) Change the colour of black tea by adding lemon juice to it.
(e) Churning of milk cream to get butter.
The chemical formula of rust is ______.
