The standard electrode potential (E^°) values of Al^3+/Al, Ag+/Ag, K+/K and Cr^3+/Cr are -1.66 V, 0.80 V, -2.93 V and -0.74 V, respectively. The correct decreasing order of the reducing power of the metals is:

NEET 2019 Odisha · ChemistryGalvanic & EMFPrevious Year Question

The standard electrode potential ( $E^{\circ}$ ) values of $Al X^{3 +} / Al$ , $Ag X^{+} / Ag$ , $K X^{+} / K$ and $Cr X^{3 +} / Cr$ are $- 1.66 V$ , $0.80 V$ , $- 2.93 V$ and $- 0.74 V$ , respectively. The correct decreasing order of the reducing power of the metals is:

Answer: (B) $K$ > $Al$ > $Cr$ > $Ag$ . \textbf{Answer:} (B) $K$ > $Al$ > $Cr$ > $Ag$ \textbf{Solution:} Reducing power is inversely related to the standard reduction potential: the more negative (lower) the $E^{\circ}$ , the stronger the reducing agent.

A. $Ag$ > $Cr$ > $Al$ > $K$
B. $K$ > $Al$ > $Cr$ > $Ag$ ✓
C. $K$ > $Al$ > $Ag$ > $Cr$
D. $Al$ > $K$ > $Ag$ > $Cr$

Correct Answer

(B) $K$ > $Al$ > $Cr$ > $Ag$

Solution & Explanation

\textbf{Answer:} (B) $K$ > $Al$ > $Cr$ > $Ag$ \textbf{Solution:} Reducing power is inversely related to the standard reduction potential: the more negative (lower) the $E^{\circ}$ , the stronger the reducing agent. Arranging $E^{\circ}$ from lowest to highest: $E_{K X^{+} / K}^{\circ} = - 2.93 < E_{Al X^{3 +} / Al}^{\circ} = - 1.66 < E_{Cr X^{3 +} / Cr}^{\circ} = - 0.74 < E_{Ag X^{+} / Ag}^{\circ} = + 0.80 V$ Therefore the decreasing order of reducing power is: $K$ > $Al$ > $Cr$ > $Ag$ .

🎯

43,000+ questions in हिंदी & English · one-tap toggle

Practice NEET 2019 Odisha Chemistry — free, with instant solutions

The app builds a daily goal from your weak topics and brings each question back just before you forget it — so what you solve today turns into marks on exam day.

Open →📚Practice all NEET Chemistry PYQs chapter-wise →💡Don't get it? Learn the Electrochemistry concepts →

← Chemistry Q17 Chemistry Q19 →

More NEET PYQ solutions

ChemThe correct value of cell potential (in volt) for the reaction that occurs when the following two half cells are connected is: Fe^2+(aq) + 2e- -> Fe(s), E^° = -0.44 V Cr2O7^2- + 14H+ + 6e- -> 2Cr^3+ + 7H2O, E^° = +1.33 V ChemThe E^° values are given as: E^ Al+/Al = +0.55 V and E^ Tl+/Tl = -0.34 V; E^ Al^3+/Al = -1.66 V and E^ Tl^3+/Tl = +1.26 V. Identify the incorrect statement.ChemThe correct option for a redox couple is ChemGiven below are the half-cell reactions: MnO4^- + 8H+ + 5e- -> Mn^2+ + 4H2O, E^ MnO4^-/Mn^2+ = -1.510 V 1/2 O2 + 2H+ + 2e- -> H2O, E^ O2/H2O = +1.223 V Will the permanganate ion, MnO4^-, liberate O2 from water in the presence of an acid?ChemAt 298 K, the standard electrode potentials of Cu^2+/Cu, Zn^2+/Zn, Fe^2+/Fe and Ag+/Ag are 0.34 V, -0.76 V, -0.44 V and 0.80 V, respectively. On the basis of standard electrode potential, predict which of the following reactions cannot occur?ChemFor the cell reaction 2Fe^3+(aq) + 2I-(aq) -> 2Fe^2+(aq) + I2(aq), E^ cell = 0.24 V at 298 K. The standard Gibbs energy ( _r G^°) of the cell reaction is:ChemConsider the change in oxidation state of bromine corresponding to the standard reduction (electrode) potentials shown for each successive step: BrO4^- +1.82 V BrO3^- +1.50 V HBrO +1.595 V Br2 +1.0652 V Br^- Then the species undergoing disproportionation is ChemIf the E^ cell for a given reaction has a negative value, which of the following gives the correct relationships for the values of G^° and Keq?

More: All NEET 2019 Odisha Chemistry PYQs · NEET Chemistry PYQs · All NEET PYQs · Previous year papers

The standard electrode potential (E∘) values of AlX3+/Al, AgX+/Ag, KX+/K and CrX3+/Cr are −1.66 V, 0.80 V, −2.93 V and −0.74 V, respectively. The correct decreasing order of the reducing power of the metals is:

Solution & Explanation

More NEET PYQ solutions

The standard electrode potential ( $E^{\circ}$ ) values of $Al X^{3 +} / Al$ , $Ag X^{+} / Ag$ , $K X^{+} / K$ and $Cr X^{3 +} / Cr$ are $- 1.66 V$ , $0.80 V$ , $- 2.93 V$ and $- 0.74 V$ , respectively. The correct decreasing order of the reducing power of the metals is: