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Rusting of iron or corrosion of active metal is initiated by
- a)cathodic reaction, when oxygen gas which is dissolved in H2O, is reduced to OH-
- b)acid rain which oxidises metal to metal ion
- c)Both (a) and (b)
- d)None of the above
Correct answer is option 'C'. Can you explain this answer?
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Rusting of iron or corrosion of active metal is initiated bya)cathodic...
Acid rain causes corrosion of metals. Even Cu, Ag and Pb are corroded.
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Rusting of iron or corrosion of active metal is initiated bya)cathodic...
Explanation:
Rusting of iron or corrosion of active metal is a process that occurs when metal comes in contact with oxygen and water. It involves the oxidation of the metal, where metal atoms lose electrons and form metal ions. This process is initiated by both a cathodic reaction and acid rain.
a) Cathodic reaction: When iron comes in contact with water, oxygen gas (O2) which is dissolved in water acts as an oxidizing agent. The oxygen gas is reduced at the cathodic site on the metal surface, where it gains electrons and forms hydroxide ions (OH-). This cathodic reaction can be represented by the following equation:
O2 + 2H2O + 4e- -> 4OH-
b) Acid rain: Acid rain is a form of precipitation that contains high levels of acids, such as sulfuric acid and nitric acid. When acid rain comes in contact with active metal, it acts as an oxidizing agent and oxidizes the metal to form metal ions. This process can be represented by the following equation:
M + 2H+ -> M2+ + H2
where M represents the metal.
c) Both (a) and (b): The rusting of iron or corrosion of active metal is initiated by both the cathodic reaction and acid rain. The oxygen gas dissolved in water acts as an oxidizing agent and reduces to hydroxide ions, while acid rain acts as an oxidizing agent and oxidizes the metal to metal ions. Therefore, both the cathodic reaction and acid rain play a role in the initiation of rusting or corrosion.
d) None of the above: This option is incorrect because both the cathodic reaction and acid rain are involved in the initiation of rusting or corrosion.
In conclusion, the correct answer is option (c) - both the cathodic reaction and acid rain initiate the rusting of iron or corrosion of active metal.
Rusting of iron or corrosion of active metal is a process that occurs when metal comes in contact with oxygen and water. It involves the oxidation of the metal, where metal atoms lose electrons and form metal ions. This process is initiated by both a cathodic reaction and acid rain.
a) Cathodic reaction: When iron comes in contact with water, oxygen gas (O2) which is dissolved in water acts as an oxidizing agent. The oxygen gas is reduced at the cathodic site on the metal surface, where it gains electrons and forms hydroxide ions (OH-). This cathodic reaction can be represented by the following equation:
O2 + 2H2O + 4e- -> 4OH-
b) Acid rain: Acid rain is a form of precipitation that contains high levels of acids, such as sulfuric acid and nitric acid. When acid rain comes in contact with active metal, it acts as an oxidizing agent and oxidizes the metal to form metal ions. This process can be represented by the following equation:
M + 2H+ -> M2+ + H2
where M represents the metal.
c) Both (a) and (b): The rusting of iron or corrosion of active metal is initiated by both the cathodic reaction and acid rain. The oxygen gas dissolved in water acts as an oxidizing agent and reduces to hydroxide ions, while acid rain acts as an oxidizing agent and oxidizes the metal to metal ions. Therefore, both the cathodic reaction and acid rain play a role in the initiation of rusting or corrosion.
d) None of the above: This option is incorrect because both the cathodic reaction and acid rain are involved in the initiation of rusting or corrosion.
In conclusion, the correct answer is option (c) - both the cathodic reaction and acid rain initiate the rusting of iron or corrosion of active metal.
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Rusting of iron or corrosion of active metal is initiated bya)cathodic reaction, when oxygen gas which is dissolved in H2O, is reduced to OH-b)acid rain which oxidises metal to metal ionc)Both (a) and (b)d)None of the aboveCorrect answer is option 'C'. Can you explain this answer?
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