Advertisements
Advertisements
प्रश्न
Differentiate between the following:
Electrolytic decomposition and photochemical decomposition.
Advertisements
उत्तर
- Electrolytic decomposition: “A decomposition reaction which is brought about by the passage of electric current.”
\[\ce{2H2O->[Electricity][Current]2H2 + O2}\] - Photochemical decomposition: “A decomposition reaction which takes place in presence of light.”
e.g. decomposition of silver salts in the presence of sunlight.
APPEARS IN
संबंधित प्रश्न
A solid substance P which is very hard is used in the construction of many buildings, especially flooring. When substance P is heated strongly, it decomposes to form another solid Q and a gas R is given out. Solid Q reacts with water with the release of a lot of heat to form a substance S. When gas R is passed into a clear solution of substance S, then a white precipitate of substance T is formed. The substance T has the same chemical composition as starting substance P.
(a) What is substance P? Write its common name as well as chemical formula.
(b) What is substance Q?
(c) What is gas R?
(d) What is substance S? What is its clear solution known as?
(e) What is substance T? Name any two natural forms in which substance T occurs in nature.
Give one example of a decomposition reaction which is carried out with electricity.
What type of reaction is represented by the following equation?
\[\ce{CaCO3 -> CaCO + CO2}\]
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Thermal decomposition of a substance is brought about with the help of
- reactants
- water
- wind
- heat
What are thermal decomposition reactions ? Explain with an example.
The chemical reaction in which two or more products are formed from a single reactant is called ______ reaction.
Chemical volcano is an example of ______ type of reaction.
Which one of the following processes involves chemical reactions?
On heating blue coloured powder of copper (II) nitrate, in a boiling tube, copper oxide (black), oxygen gas and a brown gas X is formed
- Write a balanced chemical equation of the reaction.
- Identify the brown gas X evolved.
- Identify the type of reaction.
- What could be the pH range of aqueous solution of the gas X?
