can we say that all oxidation reactions are exothermic and reduction reactions are endothermic
Asked by archita123 | 1st Jun, 2015, 10:11: PM
Oxidation reactions are exothermic(or exergonic) and release energy.
Burning of hydrogen fuel releases heat to the surrounding and is an exothermic reaction.
Reduction reactions are endothermic(endergonic) and harness energy.
Dissociation of water into hydrogen and oxygen through electrolysis is an endothermic reaction.
Answered by Vaibhav Chavan | 3rd Jun, 2015, 08:44: AM
- Assertion- Silver articles become coated with a black layer upon exposure to air. Resaon- A layer of oxide gets deposited upon oxidation with air. A- Assertion and Reason both are correct and reason is the correct explanation of assertion. B- Assertion and Reason both are correct and reason is not the correct explanation of assertion. C- Assertion is true but reason is false. D- Reason is true but assertion is false Please provide an explanation too. Asked by vandanawasan02 | 13th Feb, 2020, 09:24: AM Expert Answer: Aseertion and reason both are correct and reason is correct explanation of assertion. When silver is exposed to air, it becomes black due to oxide coating, although silver is not very reactive metal but with passage of time, it slowly reacts with oxygen in the air and forms black coloures silver oxide. Follow up question- Silver forms sulphide layer upon oxidation. I am confused between B and C. A option is definitely wrong.
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