Test Index

JAMB Chemistry 2010 Paper

Question : 21

Total: 49

AgNO_{4(aq)} + PH_{3(g)} + 3H_2O_{(l)}

Ag_{(s)} + H_3PO_{3(g)} + 6HNO_{3(aq)}

In the above reaction, the reducing agent is?

Solution:

Concept:

A reducing agent is the substance that loses electrons and gets oxidized during a reaction.

Explanation:

\mathrm{PH_3}

, phosphorus has an oxidation number of

-3

\mathrm{H_3PO_3}

, phosphorus has an oxidation number of

+3

Since the oxidation number of phosphorus increases from

-3

+3

\mathrm{PH_3}

is oxidized.

Therefore,

\mathrm{PH_3}

acts as the reducing agent by reducing

\mathrm{Ag^+}

\mathrm{AgNO_3}

to metallic

\mathrm{Ag}

Answer:

\mathrm{PH_{3(g)}}

Go to Question:

Prev Question

Next Question