Advertisements
Advertisements
Question
Decomposition reactions can occur by electricity
Give balanced reactions.
Advertisements
Solution
Electricity
Electrolysis of water i.e. the decomposition of water into hydrogen and oxygen gas when an electric current is passed through water.
\[\ce{2H2O -> 2H2 + O2}\]
Sunlight:
\[\ce{6CO2 +12 H2O -> C6H12O6 +6H2O +6O2}\]
APPEARS IN
RELATED QUESTIONS
Explain the types of reaction with reference to oxygen and hydrogen. Illustratre with examples.
Explain, giving one example for each of the following chemical changes:
Displacement
State the type of reactions for the following represent and balance the ones that are not balanced.
AgNO3 + NaCl → AgCl + NaNO3
Select the correct salt from list II which on thermal decomposition exhibits the change in colour from list I.
| List I | List II |
| 1. Light green to black | A: Copper carbonate |
| 2. White to yellow [heated state] | B: Hydrated Copper sulphate |
| 3. Blue to black | C: Copper nitrate |
| 4. Orange to green | D: Ammonium dichromate |
| 5. Blue to white | E: Zinc nitrate |
State which of the substance given below evolve oxygen gas on thermal decomposition.
Zinc nitrate
Define the following type of chemical change or reaction with a suitable example.
Direct combination reaction or synthesis
Give a balanced equation for thermal decomposition of lead carbonate
Define the term – double decomposition – neutralization reaction.
Differentiate between the following:
Synthesis reaction and a substitution reaction.
Chemical reaction in which reactants react to form products and the products formed react with each other directly to form the original reactants back is known as ______ reaction.
