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271.

Electronic configuration of only one p-block element is exceptional. One molecule of that element consists of how many atoms of it?

272.

Which oxyacid of sulphur contains S-S single bond?

273.

Which among the following group 15 element forms most stable pentavalent compound?

Two

The structure of ortho phosphorous acid will be

Here, two -OH groups are directly attached with P-atom, hence the basicity of the compound is two.

275.

Which oxoacid of sulphur contains S-S bond in its structure?

276.

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

277.

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

278.

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

279.

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

280.

Freon 12 is manufactured from CCl₄ by