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प्रश्न
What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.
What is called for the reaction which involves oxidation and reduction simultaneously? Explain with one example.
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उत्तर १
The process in which oxidation and reduction occur simultaneously is called as redox reaction.
- Oxidation is the loss of electrons or an increase in oxidation state by a molecule, atom, or ion.
- Reduction is the gain of electrons or a decrease in oxidation state by a molecule, atom, or ion.
For example: If we add a stannous chloride solution to the yellow solution of ferric chloride then light green ferrous chloride solution and stannic chloride solution are produced.
Before the reaction, 3Cl atoms were attached to each iron atom. After the reaction, only two chlorine atoms are attached. That is one negative chlorine atom is released. Therefore, reduction of FeCl3 happened or this reactor on the other hand, before the reaction two chlorine atoms were attached with each atom of tin (stannum). Due to the above reaction, the number of chlorine attached to the tin atom increases to four. That is, oxidation of SnCl2 has taken place. Therefore, in this reaction oxidation of one substance and reduction of another substance take place simultaneously. This is called a redox reaction.
उत्तर २
The reaction in which oxidation and reduction takes place simultaneously is called a redox reaction.
Example:
\[\ce{CuO + H2 -> Cu + H2O}\]
In this reaction, CuO loses oxygen to form Cu. This means that reduction of CuO takes place. H2 molecule takes up oxygen to form H2O. This means that oxidation of H2 takes place. Both the oxidation and reduction reactions always occur simultaneously.
संबंधित प्रश्न
The gas we use in the kitchen is called liquefied petroleum gas (LPG). In the cylinder, it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − A), then it burns (Change − B). The following statements pertain to these changes. Choose the correct one.
Define catalyst.
Fill in the blanK
A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.
Fill in the blank
A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.
MATCH THE COLUMNS
| 1 . `H_2` + `CI_2` `→` 2HCI | a. displacement reaction |
| 2. `2FeCI_3`+ `H_2` `→` `2FeCI_2` +2HCI` | b. addition of an electronegative redical |
| 3. Fe + `CuSO_4` `→``FeSO_4` +Cu` | c. removal of an electronegative redical |
| 4. `2H_2O` +`4NO_2`+`O_2` `→` `4HNO_3` | d.reduction by adding hydrogen |
| 5. 3Fe +`3CI_2` `→` `2FeCI_3` | e.electrolysis of water |
| 6. `FeCI_3`+ 3NaOH `→``Fe(OH)_3``↓`+NaCI | F.double decomposition,precipitation reaction |
| 7.`2H_2O` `→` `2H_2``↑`+`O_2` | e. combination or synthesis reaction |
TRUE \ FALSE
Copper can displace iron from iron sulphate.
A solution of a substance ‘X’ is used for white washing Name the substance ‘X’ and write its formula.
Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.
(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)
Chlorine (Cl2) molecule is formed by ______ of electrons between two chlorine atoms.
Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.
Water
Name: Two nitrates that do not produce nitrogen dioxide on heating.
Explain the term ‘chemical reaction’ with special reference to – ‘reactants’ and ‘products’.
Give reason for the following:
Even though rusting is an exothermic reaction, the heat evolved when an iron nail rusts is unnoticeable.
Give balanced equation for the following conversion affected by heat alone on the substance:
Hydrated copper sulphate to sulphur dioxide
Match the chemical reactions in List I with the appropriate answer in List II.
| List I | List II | ||
| 1. | \[\ce{XY⇌[heat]X + Y}\] | A: | Displacement reaction |
| 2. | \[\ce{XY->X + Y}\] | B: | Double decomposition |
| 3. | \[\ce{X+Y- + A+B^-->X+B- + A+Y-}\] | C: | Endothermic reaction |
| 4. | \[\ce{X + YZ->XZ + Y}\] | D: | Thermal dissociation |
| 5. | \[\ce{X + Y->[heat]XY -\Delta}\] | E: | Decomposition reaction |
Burning of paper is a ______ change.
The percentage composition of Nitrogen in Ureas is ______.
______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.
The chemical name of baking soda is sodium bicarbonate.
Write the equation for the process of formation of rust.
Write a note on the catalyst.
