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प्रश्न
Explain the types of reaction with reference to oxygen and hydrogen. Illustratre with examples.
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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:
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संबंधित प्रश्न
The reaction of iron nail with copper sulphate solution is ______ reaction.
Complete the following statement.
In the type of reaction called_______________, two compounds exchange their positive and negative radicals.
Explain, giving one example of the following chemical changes:
Double decomposition
Explain, giving one example of the following chemical change:
Thermal dissociation
(a) What is synthesis?
(b) What kind of chemical reaction is synthesis? Support your answer by an example.
Decomposition brought about by heat is known as thermal decomposition. What is the difference between thermal dissociation and thermal decomposition?
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
What is a double displacement reaction?
Give an example of double displacement reaction, where a gas is evolved.
Decomposition reactions can occur by sunlight.
Give two balanced reactions.
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.
Trilead tetroxide
State which of the substance given below evolve oxygen gas on thermal decomposition.
Mercury [II] oxide
State which of the substance given below evolve oxygen gas on thermal decomposition.
Anhydrous copper sulphate
The reaction can be classified as:
State which of the following type, take place in the reaction is given below.
\[\ce{AgNO3 + HCl->AgCl + HNO3}\]
The reaction can be classified as:
State which of the following type, take place in the reaction is given below.
\[\ce{4HNO3->4NO2 + 2H2O + O2}\]
Define the following type of chemical change or reaction with a suitable example.
Displacement reaction or substitution 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 a direct combination reaction involving:
Two compounds – resulting in the formation of a weak acid
Give a balanced equation for thermal decomposition of mercury [II] oxide
Name a metallic oxide which on thermal decomposition is reduced to metal.
Define a displacement reaction with a suitable example.
State how displacement reaction represented.
State the double decomposition – neutralization reaction with a suitable representation.
Convert an insoluble base
Complete the statement by filling in the blank with the correct word:
Formation of hydrogen chloride from hydrogen and chlorine is an example of __________.
Select the correct answer from the options given below:
State the gaseous product formed, when
A metallic nitrate undergoes thermal decomposition giving a coloured 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.
Give a balanced equation for the following type of reaction:
A synthesis reaction between a metal and a non-metal resulting in the formation of an insoluble salt of iron.
Give a balanced equation for the following type of reaction:
A decomposition reaction of a salt which leaves behind a silvery metal.
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.
