Identify which reagent gets oxidized in each of the following redox reactions.

label Chemistry
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HIO3 + 3H2SO3 " src="http://educog.com/res/sfu/batchelo/Gallery/rarrow.gif" align="middle"> HI + 3H2SO4 

 2Al + Cr2O3 " src="http://educog.com/res/sfu/batchelo/Gallery/rarrow.gif" align="middle"> 2Cr + Al2O3 

 3H2S + 2HNO3 " src="http://educog.com/res/sfu/batchelo/Gallery/rarrow.gif" align="middle"> 3S + 2NO + 4H2

 2Cr2O3 + 3Si " src="http://educog.com/res/sfu/batchelo/Gallery/rarrow.gif" align="middle"> 4Cr + 3SiO2 
May 12th, 2015

oxidation is:

* loss of electrons.

* loss of hydrogen.

* gain of oxygen

1) Al gets oxidized.

2) S in H2S gets oxidized

3) Si gets oxidized

May 12th, 2015

in the very first reaction S with +4 oxidation state in H2SO3 will get oxidized to H2SO4 with +6 oxidation state.

in the other reaction you have asked, S has -2 oxidation state and it oxidizes to S with 0 (zero) oxidation state.

May 12th, 2015

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May 12th, 2015
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May 12th, 2015
Jun 29th, 2017
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