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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.
The chemical change involving iron and hydrochloric acid illustrates a _________________ reaction.
Explain, giving one example of the following chemical changes:
Double decomposition
Explain, giving one example of the following chemical change:
Thermal dissociation
(a) Define the neutralization reaction with an example.
(b) Give a balanced equation for this reaction.
(c) Give three applications of neutralization reactions.
State the type of reactions for the following represent and balance the ones that are not balanced.
PbO2 + SO2→ PbSO4
State the type of reactions for the following represent and balance the ones that are not balanced.
2KClO3→ 2KCl + 3O2
State the type of reactions for the following represent and balance the ones that are not balanced.
2H2O2→ 2H2O + O2
State the type of reactions for the following represent and balance the ones that are not balanced.
KNO3 + H2SO4 → HNO3 + KHSO4
State the type of reactions for the following represent and balance the ones that are not balanced.
CuO+H2→ Cu+ H2O
Give an example of double displacement reaction, where a gas is evolved.
What is a decomposition reaction?
Decomposition reactions can occur by heat.
Give two balanced reactions for each.
State which of the substance given below evolve oxygen gas on thermal decomposition.
Zinc carbonate
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 |
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.
\[\ce{4HNO3->4NO2 + 2H2O + O2}\]
Define the following type of chemical change or reaction with a suitable example.
Direct combination reaction or synthesis
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 the following reaction of synthesis involving the formation of:
A salt – from a trivalent metal and a coloured gas.
Give a balanced equation for thermal decomposition of calcium hydroxide
Define a displacement reaction with a suitable example.
State how displacement reaction represented.
Define the term – double decomposition – neutralization reaction.
Complete the statement by filling in the blank with the correct word:
The neutral gas evolved when lead nitrate undergoes thermal decomposition is _________.
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 thermal decomposition reaction of a salt – which results in the formation of nitrogen gas.
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.
Differentiate between the following:
Thermal decomposition & thermal dissociation.
