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Introduction to Chemical Reactions
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Introduction to Chemical Reactions
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25 Questions

1. Positive oxidation state can never be shown by which element?
2. Which of the following compounds will decompose when electricity is passed through the aqueous solution of the following compounds?
3. The compound which acts both as oxidizing and as reducing agent is
4. The oxidation number of chlorine in HOCl is
5. Fluorine reacts with water to give oxygen or ozone because fluorine is
6. The element exhibiting most stable +2 oxidation state among the following is
7. The oxidation number of iron in potassium ferricyanide is
8. The oxidation states of the most electronegative element in the products of the reaction, BaO2 with dilute H2SO4 are
9. The atomic number of an element which shows the oxidation state of +3 is
10. One gas bleaches the colour of flowers by reduction while the other by oxidation. The gases are
11. A solution of sodium metal in liquid ammonia is strongly reducing due to the presence of
12. The oxidation number of I in I PO4 is
13. 44.8 g of pure potassium iodide was dissolved in water and the volume of the solution was made 1 dm3. x ml of this solution was taken and about 20 ml of 6 M HCl was added to it. This mixture solution required 30 ml of decimolar KIO3 solution for complete oxidation of I' ions into ICI. The value of x is
14. A sample of steel weighting 3.0 g was subjected to a chemical reaction to convert its sulphur into H2S gas. The evolved gas required 2.40 ml of 0.02 N solution of iodine. Then the percentage of S in steel is
15. The oxidation states of the most electronegative element in the products of the reaction, BaO2 with dilute H2SO4 are
16. A sample of steel weighting 3.0 g was subjected to a chemical reaction to convert its sulphur into H2S gas. The evolved gas required 2.40 ml of 0.02 N solution of iodine. Then the percentage of S in steel is
17. Sulphur dioxide bleaches colouring matter by
18. Which of the following statements about oxygen is incorrect? It has an oxidation number
19. Which of the following statements about oxygen is incorrect? It has an oxidation number
20. The atomic number of an element which shows the oxidation state of +3 is
21. 44.8 g of pure potassium iodide was dissolved in water and the volume of the solution was made 1 dm3. x ml of this solution was taken and about 20 ml of 6 M HCl was added to it. This mixture solution required 30 ml of decimolar KIO3 solution for complete oxidation of I' ions into ICI. The value of x is
22. Reduction involves
23. Which cannot be a reducing agent?
24. Oxidation state of +3 for phosphorus is in
25. The volume of 0.01 m KMnO4 solution required in acidic medium for complete oxidation of 100 ml of ferrous oxalate solution of strength 3.6 gl'1 is

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