Advertisements
Advertisements
प्रश्न
Explain the types of reaction with reference to oxygen and hydrogen. Illustratre with examples.
Advertisements
उत्तर
There are three main types of chemical reactions with reference to oxygen and hydrogen:
- Combination Reaction
When two atoms react to form a compound, it is known as a combination reaction.
For example: \[2 H_2 + O_2 \to 2 H_2 O\] - Decomposition Reaction
When a compound breaks into simple molecular substances from which it is made up, it is known as a decomposition reaction.
For example: \[2 H_2 O \to 2 H_2 + O_2\]- Oxidation and reduction reaction:
Oxidation:- The addition of oxygen to a substance is called oxidation.
- The removal of hydrogen to a substance is called oxidation.
- Reduction:
- The addition of hydrogen to a substance is called reduction.
- The removal of oxygen to a substance is called reduction.
For example: \[CuO + H_2 \to Cu + H_2 O\]
- Oxidation and reduction reaction:
APPEARS IN
संबंधित प्रश्न
The reaction of iron nail with copper sulphate solution is ______ reaction.
Explain, giving one example of the following chemical change:
Thermal dissociation
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.
CuO+H2→ Cu+ H2O
State the type of reactions for the following represent and balance the ones that are not balanced.
CaCO3→ CaO+ CO2
State the type of reactions for the following represent and balance the ones that are not balanced.
PbO + 2HNO3→ Pb(NO3) + 2H2O
Multiple choice:
The reaction BaCl2(aq) + H2SO4(aq) → BaSO4(s) + 2HCl(aq) is
What is a decomposition reaction?
Decomposition reactions can occur by heat.
Give two balanced reactions for each.
Decomposition reactions can occur by sunlight.
Give two balanced reactions.
State which of the substance given below evolve oxygen gas on thermal decomposition.
Washing soda
State which of the substance given below evolve oxygen gas on thermal decomposition.
Lead nitrate
State which of the substance given below evolve oxygen gas on thermal decomposition.
Ammonium dichromate
Complete the table given below.
| Heat on Copper Nitrate | Colour of acidic gas evolved |
Define the following type of chemical change or reaction with a suitable example.
Direct combination reaction or synthesis
Define the following type of chemical change or reaction with a suitable example.
Decomposition reaction
Define the following type of chemical change or reaction with a suitable example.
Double decomposition reaction
Give a balanced equation for a direct combination reaction involving:
Two elements – one of which is a neutral gas and the other a monovalent metal
Give a balanced equation for the following reaction of synthesis involving the formation of:
An alkali – from a basic oxide – sodium oxide
Give a balanced equation for the following reaction of synthesis involving the formation of:
A salt – from a trivalent metal and a coloured gas.
Convert nitrogen to ammonia by a direct combination reaction.
Give a balanced equation for thermal decomposition of lead nitrate
Give a balanced equation for thermal decomposition of ammonium dichromate
Give a balanced equation for thermal decomposition of calcium hydroxide
Define a thermal dissociation reaction with a suitable example.
Give an example of a photochemical decomposition reaction.
Explain the term double decomposition precipitation reaction.
Give a balanced equation for the preparation of two different insoluble lead salts from their salt solutions by double decomposition precipitation.
Give a balanced equation for the following type of reaction:
A direct combination reaction between phosphorus and neutral gas.
Give a balanced equation for the following type of reaction:
A soluble salt of lead formed from an insoluble base by double decomposition – neutralization.
Differentiate between the following:
Thermal decomposition & thermal dissociation.
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.
