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Periodic Properties

38. Which of ...

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38. Which of the following statement is incorrect? (1) Al2O3 cannot be reduced into Al by Cr2O3 (2) Ca is stronger reducing agent than Mg (3) At 673 K, CO is poor reducing agent than carbon (4) All of these

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$E^{\circ}$ for some half cell reactions are given below
$S n^{+ 4} + 2 e^{-} \to S n^{2 +}; E^{\circ} = 0.151 V$
$2 H g^{2 +} + 2 e \to H g_{2}^{2 +}; E^{\circ} = 0.92 V$
$P b O_{2} + 4 H^{+} 2 e^{-} \to P b^{2 +} + 2 H_{2} O; E^{\circ} = 1.45 V$
Based on the given data which statement is correct.

Out of C and $C O_{1}$ which is a better reducing agent at 673 K?

Assertion: Copper metal can reduce

F e^{2 +}

in acidic medium.

Reason: Copper is a stronger reducing agent than Iron.

Q. In the following reaction, the correct statements are:

M g + 2 H^{+} \to M g^{2 +} + H_{2}

M g

is a reducing agent,

H^{+}

is an oxidising agent.
2.

M g

is oxidising agent,

H^{+}

is a reducing agent.

Out of C and CO, which is a better reducing agent at 673 K?

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