(a) Why do transition elements show variable oxidation states? (i) Name the element showing maximum number of oxidation states among the first series of transition metals from Sc (Z = 21) to Zn (Z = 30). (ii) Name the element which shows only +3 oxidation state. (b) What is lanthanoid contraction? Name an important alloy which contains some of the lanthanoid metals.

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A:

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A: ANSWER IS

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A:

Q: Why do transition elements show variable oxidation states?

A:

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A: The molecular equation can be written as:

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A: The chemical structure of CrO5 is drawn as,

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A:

Q: The oxidation state of chromium in K2CrO4 is

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Q: excess

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A:

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A:

Q: 10. What are the oxidation states of the elements present in S2O3-2?

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A:

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Q: hydrated CuSO4 is blue in colour. why?

A: The molecule that contains water molecule is termed as hydrous.