The reaction(s) involved in the preparation of potassium dichromate from iron chromite ore is/are:

1. FeCr2O+ NaOH + O→ Na2CrO4 + Fe2O3 + H2O
2. Na2CrO+ H2SO4 (conc.) →
Na2Cr2O+ Na2SO+ H2O
3. Na2Cr2O+ KCl→ K2Cr2O7 + NaCl 
4. All of the above.
Subtopic:  Chemistry of Mn and Cr Compounds |
 86%
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A gas that can readily decolorize an acidified KMnO4 solution is:

1. SO2

2. NO2

3. P2O5

4. CO2

Subtopic:  d-Block Elements- Properties & Uses | Chemistry of Mn and Cr Compounds |
 73%
From NCERT
NEET - 2017
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The oxidation state of chromium in the final product formed by the reaction between KI and acidified potassium dichromate solution will be:

1. +2

2. +3

3. +4

4. +6

Subtopic:  Chemistry of Mn and Cr Compounds |
 64%
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Highest oxidation state of manganese in fluoride is +4 (MnF4) but the highest oxidation state in oxides is +7 (Mn2O7). The reason is :

1. Fluorine is more electronegative than oxygen.
2. Fluorine does not possess d orbitals.
3. Fluorine stabilizes lower oxidation state of Mn.
4. In covalent compounds, fluorine can only form a single bond while oxygen forms a double bond.

Subtopic:  Chemistry of Mn and Cr Compounds |
 67%
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