The oxidation number and covalency of sulphur in the sulphur molecule (S8) are respectively:

1. 0 and 2

2. +6 and 8

3. 0 and 8

4. +6 and 2

Subtopic:  Oxidizing & Reducing Agents |
 55%
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H2S is passed through an acidified solution of copper sulphate and a black precipitate is formed. This is due to:

1. oxidation of Cu2+

2. reduction of Cu2+

3. double decomposition

4. reduction and oxidation

Subtopic:  Oxidizing & Reducing Agents |
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The most common oxidation state of an element is -2. The number of electrons present in its outermost shell is:

1. 2

2. 4

3. 6

4. 8

Subtopic:  Oxidizing & Reducing Agents |
 77%
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4P + 3KOH + 3H2 3KH2PO2 + PH3:

Correct statement regarding the above reaction is -

1. P oxidised only

2. P is reduced only

3. P is oxidised as well as reduced

4. None of the above

Subtopic:  Introduction to Redox and Oxidation Number |
 86%
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In which SOacts as oxidant, while reacting with:

1. acidified KMnO4

2. acidified K2Cr2O7

3. H2S

4. H202

Subtopic:  Oxidizing & Reducing Agents |
 60%
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In the reaction;

3Br2 + 6CO32- + 3H25Br- + BrO3- + 6HCO3-

which statement is correct?

1. Br2 is oxidised

2. Br2 is reduced

3. Br2 is neither oxidised nor reduced

4. Br2 is oxidised and reduced as well 

Subtopic:  Introduction to Redox and Oxidation Number |
 83%
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When NaCl is dissolved in water, the sodium ion becomes:

1. oxidised

2. reduced

3. hydrolysed

4. hydrated

Subtopic:  Introduction to Redox and Oxidation Number |
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If H2S is passed through an acidified K2Cr2O7 solution, the colour of the solution:

a. will remain unchanged

b. will change to deep red

c. will change to dark green

d. will change to dark brown 

Subtopic:  Introduction to Redox and Oxidation Number |
 59%
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Which of the following reactions does not represent a redox change?

1. CaCO3 CaO + CO2

2. 2H2 + O2 2H2O

3. Na + H2 NaOH + \(\frac{1}{2}\)H2

4. MnCl3  MnCl2 + \(\frac{1}{2}\)Cl2

Subtopic:  Introduction to Redox and Oxidation Number |
 71%
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Oxidation state of +1 for phosphorus is found in:

1. H3PO3 

2. H3PO4

3. H3PO2

4. H4P2O7

Subtopic:  Oxidizing & Reducing Agents |
 88%
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