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.
Complete the following statement.
The chemical change involving iron and hydrochloric acid illustrates a _________________ reaction.
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.
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.
2H2O2→ 2H2O + O2
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.
NH4Cl → NH3 + HCl
Match the following:
|
a. Zn(s) + H2SO4(aq) → ZnSO4(aq) + H2(g) |
i. Photochemical decomposition |
|
b. \[\ce{2AgCI(s) ->[Sunlight] 2Ag(s) + CI2(g)}\] |
ii. Thermal decomposition |
|
c. \[\ce{2KCI ->[Electricity] 2K + CI2}\] |
iii. Displacement reaction |
|
d. \[\ce{2HgO(s) ->[\Delta] 2Hg(s) + O(g)}\] |
iv. Electrolytic decomposition |
What is a decomposition reaction?
Decomposition reactions can occur by sunlight.
Give two balanced reactions.
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.
Anhydrous copper sulphate
The reaction can be classified as:
State which of the following type, take place in the reaction is given below.
\[\ce{Cl2 + 2Kl->2KCl + l2}\]
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.
Double decomposition reaction
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.
Convert nitrogen to ammonia by a direct combination reaction.
Convert hydrogen to hydrogen chloride by a direct combination reaction.
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.
State the double decomposition – neutralization reaction with a suitable representation.
Complete the statement by filling in the blank with the correct word:
Formation of hydrogen chloride from hydrogen and chlorine is an example of __________.
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 direct combination reaction between phosphorus and neutral gas.
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.
Differentiate between the following:
Decomposition reaction and a double decomposition reaction.
Match the chemical reactions in List I with the appropriate answer in List II.
| List I | List II |
| 1. \[\ce{AB⇌[heat]A + B}\] | A: Double decomposition |
| 2. \[\ce{AB->A + B}\] | B: Thermal dissociation |
|
3. \[\ce{X+Y- + AB+B- ->X+B- + A+Y-}\] |
C: Endothermic reaction |
| 4. \[\ce{X + YZ->XZ + Y}\] | D: Displacement reaction |
| 5. \[\ce{X + Y->[heat]XY - \Delta}\] | E: Decomposition reaction |
