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The elements, selenium and tellurium occur as metal selenides and tellurides in
(a)Carbonate ores
(b)Sulphide ores
(c)Oxide ores
(d)Sulphate ores

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Important Questions on The p-Block Elements
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The following table represents the elements and the atomic number. With reference to this, answer the following using only the alphabets given in the table.
Element | Atomic number |
Which element has an electron affinity zero?

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Statement I : and forms of sulphur can change reversibly between themselves with slow heating or slow cooling.
Statement II : At room temperature the stable crystalline form of sulphur is monoclinic sulphur.
In the light of the above statements, choose the correct answer from the options given below:

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Give a reason for the following:
Inert gases do not form ions.

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