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861.

Which halogen forms an oxyacid that contains the halogen atom in tripositive oxidation state?

862.

Identify the compound, in which phosphorus exists in the oxidation state of +1.

863.

In preparation of sulphuric acid from sulphur dioxide in lead chamber process. What substance is used as a catalyst?

864.

Which halogen has the highest value of negative electron gain enthalpy?

865.

Freon 12 is manufactured from CCl₄ by

In the group 16, most metallic element does not show -2 oxidation state as its electronegativity is very low.

Hence, Po (polonium) (Z = 84) does not show -2 oxidation state because on· going down the group, electropositive nature increases.

867.

In which one of the following compounds of xenon, highest number of lone pair of electrons is present in xenon?

868.

Which one of the following has the maximum number of P-OH bonds?

869.

Which one of the following statements is not true in respect of propeties of interhalogen compounds?

870.

Which of the following noble gases has the nighest positive electron gain enthalpy value?