Advertisements
Advertisements
प्रश्न
Give reason for the following:
The catalytic oxidation of sulphur dioxide to sulphur trioxide is represented by a double arrow {⇌}
between the reactants and products, formed in the chemical reaction.
Advertisements
उत्तर
The reaction is reversible shown by the double arrow.
The Equation of Oxidation of sulphur dioxide to sulphur trioxide is as follows:
\[\ce{2SO2 + O2 ⇌[V2O5][450°C] 2 SO3 + \triangle}\]
[Vanadium pentoxide (V2O5) - catalyst]
APPEARS IN
संबंधित प्रश्न
State whether the following statement is true or false. In case a statement is false, write the corrected statement.
Iron pipes coated with zinc do not get rusted easily.
FILL IN THE BLANK
A .............. change is a temporary change.
FILL IN THE BLANK
In a double decomposition precipitation reaction both the reactants must be ............ soluble.
FILL IN THE BLANK
Positively charged ions are called ........
TRUE \ FALSE
A precipitation reaction takes place only in a solution.
TRUE \ FALSE
The evolution of a gas during a chemical reaction is shown by an arrow pointing downwards. True or false ?
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
A change in which the substance can be brought back to its original state is called a _______ change.
State four conditions necessary for a chemical reaction to take place.
Give an example of the following chemical change.
A reaction where colour change is noticed
Multiple choice:
Which of the following is not a characteristic of a chemical change?
Name: A brown gas
State the original colour of the following substance and colour of residue obtained after heating.
Ammonium dichromate
Distinguish by heating the following in dry test tubs.
Zinc carbonate, Copper carbonate and lead carbonate.
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 – Addition of dilute hydrochloric acid to silver nitrate.
Give balanced equation for the following conversion affected by heat alone on the substance:
Copper carbonate to copper oxide
Give a suitable example with an equation to show the representation of a chemical reaction.
Assertion: The formation of iron oxide from iron is a chemical change.
Reason: For the rust to form from iron, it must be exposed to air and water.
Can a nickel spatula be used to stir copper sulphate solution? Justify your answer.
How would you show that the settling of curd is a chemical change?
