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Assertion : Although aluminium is above ...

Assertion : Although aluminium is above hydrogen in electrochemical series, it is stable in air and water.
Reason : The thin protective layer of oxide `(AI_(2) O_(3))` on the surface protects the aluminium.

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To solve the question, we need to analyze the assertion and the reason provided. ### Step 1: Understanding the Assertion The assertion states that "Although aluminium is above hydrogen in the electrochemical series, it is stable in air and water." - **Analysis**: The electrochemical series ranks metals based on their reactivity. Aluminium is indeed above hydrogen, which implies that it should be more reactive than hydrogen. However, in practice, aluminium does not react readily with air or water under normal conditions. **Hint**: Consider the implications of the electrochemical series and how it relates to the stability of metals in different environments. ### Step 2: Understanding the Reason The reason given is "The thin protective layer of oxide (Al2O3) on the surface protects the aluminium." - **Analysis**: Aluminium reacts with oxygen in the air to form a thin layer of aluminium oxide (Al2O3). This layer is highly stable and adheres strongly to the surface of the aluminium, preventing further oxidation and protecting the underlying metal from reacting with air and water. **Hint**: Think about the role of protective oxide layers in preventing corrosion and how they affect the reactivity of metals. ### Step 3: Evaluating the Relationship Between Assertion and Reason Now we need to determine if the reason provided correctly explains the assertion. - The assertion claims that aluminium is stable despite being above hydrogen in the electrochemical series, and the reason explains that this stability is due to the protective layer of Al2O3. Since the reason directly addresses why aluminium is stable in air and water, it supports the assertion. **Hint**: Assess whether the reason logically supports the assertion or if they are independent statements. ### Conclusion Both the assertion and the reason are correct, and the reason is indeed the correct explanation for the assertion. Therefore, the answer is: **Answer**: A - Both assertion and reason are correct statements, and the reason is the correct explanation of the assertion.
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Despite the fact that aluminium is a reactive metal, it is a stable in air as well as in water. This is due to the formation of thin layer of oxide on the surface of aluminium metal which makes it passive for further attack. The layer is so useful, that in industry, it is purposely deposited by an electrolytic process called anodising. Reaction of aluminium with oxygen is highly exothermic and is called thermite reaction. 2Al_((s)) +(3)/(2) O_(2(g)) rarr Al_(2)O_(3(s)) Delta_(f) H^(Ө) = -1670 kJmol^-1 This reaction finds application for welding of metal and in the metallurgical extraction of many metals from their oxides. The limitation is that to start the reaction, high temperature is required for which an ignition mixture is required. Aluminium becomes passive in :

Despite the fact that aluminium is a reactive metal, it is a stable in air as well as in water. This is due to the formation of thin layer of oxide on the surface of aluminium metal which makes it passive for further attack. The layer is so useful, that in industry, it is purposely deposited by an electrolytic process called anodising. Reaction of aluminium with oxygen is highly exothermic and is called thermite reaction. 2Al_((s)) +(3)/(2) O_(2(g)) rarr Al_(2)O_(3(s)) Delta_(f) H^(Ө) = -1670 kJmol^-1 This reaction finds application for welding of metal and in the metallurgical extraction of many metals from their oxides. The limitation is that to start the reaction, high temperature is required for which an ignition mixture is required. Anodised aluminium is.

Despite the fact that aluminium is a reactive metal, it is a stable in air as well as in water. This is due to the formation of thin layer of oxide on the surface of aluminium metal which makes it passive for further attack. The layer is so useful, that in industry, it is purposely deposited by an electrolytic process called anodising. Reaction of aluminium with oxygen is highly exothermic and is called thermite reaction. 2Al_((s)) +(3)/(2) O_(2(g)) rarr Al_(2)O_(3(s)) Delta_(f) H^(Ө) = -1670 kJmol^-1 This reaction finds application for welding of metal and in the metallurgical extraction of many metals from their oxides. The limitation is that to start the reaction, high temperature is required for which an ignition mixture is required. Anodising can be done by elecrolysing dil H_(2)SO_(4) with Al as anode. This results in :

Despite the fact that aluminium is a reactive metal, it is a stable in air as well as in water. This is due to the formation of thin layer of oxide on the surface of aluminium metal which makes it passive for further attack. The layer is so useful, that in industry, it is purposely deposited by an electrolytic process called anodising. Reaction of aluminium with oxygen is highly exothermic and is called thermite reaction. 2Al_((s)) +(3)/(2) O_(2(g)) rarr Al_(2)O_(3(s)) Delta_(f) H^(Ө) = -1670 kJmol^-1 This reaction finds application for welding of metal and in the metallurgical extraction of many metals from their oxides. The limitation is that to start the reaction, high temperature is required for which an ignition mixture is required. Which of the following metals cannot be extracted by using Al as a reducing agent ?

Despite the fact that aluminium is a reactive metal, it is a stable in air as well as in water. This is due to the formation of thin layer of oxide on the surface of aluminium metal which makes it passive for further attack. The layer is so useful, that in industry, it is purposely deposited by an electrolytic process called anodising. Reaction of aluminium with oxygen is highly exothermic and is called thermite reaction. 2Al_((s)) +(3)/(2) O_(2(g)) rarr Al_(2)O_(3(s)) Delta_(f) H^(Ө) = -1670 kJmol^-1 This reaction finds application for welding of metal and in the metallurgical extraction of many metals from their oxides. The limitation is that to start the reaction, high temperature is required for which an ignition mixture is required. The reaction which is not involved in thermite process is

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