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A brown-black compound of thallium was found to contain 89.5% Tl and 10.5% oxygen. What is oxidation number of thallium in this compound? [Atomic weight of Tl = 204]
- a)zero
- b)I
- c)II
- d)III
Correct answer is option 'D'. Can you explain this answer?
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A brown-black compound of thallium was found to contain 89.5% Tl and 1...
Empirical formula of the compound = Tl
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A brown-black compound of thallium was found to contain 89.5% Tl and 1...
Calculation of Thallium's Oxidation Number
Thallium is a Group 13 element, typically exhibiting an oxidation state of +1 or +3. To determine the oxidation number in the given compound, we can use the concept of oxidation state balance in a compound.
Step 1: Calculate the Total Oxidation Number
- Since the compound contains only thallium and oxygen, the total oxidation number in the compound must be zero.
- Let x be the oxidation number of thallium in the compound.
- The compound has 89.5% thallium and 10.5% oxygen by mass.
Step 2: Calculate the Oxidation Number of Thallium
- The atomic weight of thallium is 204, and there are no isotopes mentioned, so the average atomic mass is 204.
- Therefore, the mass of thallium in the compound = 0.895 * 204 = 182.28 g
- The mass of oxygen in the compound = 0.105 * 16 = 1.68 g
Step 3: Determine the Oxidation Number
- Let the oxidation number of oxygen be -2.
- Now, the total oxidation number equation is: x(Thallium) + (-2)(Oxygen) = 0
- Substituting the masses of thallium and oxygen, we get: x(182.28) + (-2)(1.68) = 0
- Solving for x, we get x = 3.
Therefore, the oxidation number of thallium in the given compound is +3, which corresponds to option III.
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A brown-black compound of thallium was found to contain 89.5% Tl and 10.5% oxygen. What is oxidation number of thallium in this compound? [Atomic weight of Tl = 204]a)zerob)Ic)IId)IIICorrect answer is option 'D'. Can you explain this answer?
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