| 1 |
Which one of the following elements has no variable valency. |
- A. Zinc
- B. Iron
- C. cobalt
- D. Manganese
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| 2 |
Group VI B to transition elements contains |
- A. Zn, Cd, Hg
- B. Fe, Ru, OS
- C. Cr, MO, W
- D. Mn, Te, Re
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| 3 |
<div>Which of the following is non-typical transition metal</div> |
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| 4 |
The conversion of potassium magnate to potassium permanganate by passing Cl2 Through aqueous solution of K2MnO4 is called. |
- A. Contact process
- B. Open hearth process
- C. Stadeler's process
- D. Thermite process
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| 5 |
Which is not an ore of iron |
- A. haematite
- B. Magnetite
- C. limonite
- D. Cassiterite
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| 6 |
The chemical composition of pyrolusite is. |
- A. KMnO4
- B. K2MnO4
- C. MnO2
- D. MnO
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| 7 |
In [Co(NH3)6]+3 the coordination number of cobalt is. |
- A. Zero
- B. Two
- C. Four
- D. Six
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| 8 |
Group VI-B of transition elements contains |
- A. Zn, Cd, Hg
- B. Fe, Ru, Os
- C. Cr, Mo, W
- D. Mn, Te, Re
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| 9 |
Which of the following is a typical transition metal. |
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| 10 |
Which one of the following elements commonly exhibits oxidation states of +6 and +3 in aqueous solution. |
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