# GATE MT 2017 Q26. The pourbaix plot of reaction Al3+ + 2H2O = AlO2- + 4H+ in potential( E) versus pH diagram is :

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Askmemetallurgy Official

Asked: 2020-07-02T15:21:55+05:30
2020-07-02T15:21:55+05:30In: Thermodynamics & Rate Processes

10%A ( 3 voters )
3.33%B ( 1 voter )
76.67%C ( 23 voters )
10%D ( 3 voters )

Based On 30 Votes

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Correct answer is option C. Given reaction: Al3+ + 2H2O = AlO2- + 4H+ No involvement of electrons takes place in the above reaction. Thus, it is not a redox reaction. Potential is only dependent on pH.

Correct answer is option C.

Given reaction: Al

^{3+}+ 2H_{2}O = AlO_{2}^{–}+ 4H^{+}No involvement of electrons takes place in the above reaction. Thus, it is not a redox reaction. Potential is only dependent on pH.

See lessCorrect Ans. - C The reaction is acid-base type. Since there is no involvement of electrons. Hence the curve is independent of potential i.e even by changing potential(E), pH is not varied. So the curve is parallel to y-axis.

Correct Ans. – C

The reaction is acid-base type. Since there is no involvement of electrons. Hence the curve is independent of potential i.e even by changing potential(E), pH is not varied. So the curve is parallel to y-axis.

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