Multiple Choice QuestionsElectronic configuration of only one p-block element is exceptional. One molecule of that element consists of how many atoms of it?
One
Two
Three
Four
Which oxyacid of sulphur contains S-S single bond?
Oleum
Marshall's acid
Dithionic acid
Thiosulphuric acid
Which among the following group 15 element forms most stable pentavalent compound?
Phosphorus
Antimony
Bismuth
Arsenic
Which oxoacid of sulphur contains S-S bond in its structure?
Disulphurous acid
Disulphuric acid
Perdisulphuric acid
Hydrosulphurous acid
Which halogen forms an oxyacid that contains the halogen atom in tripositive oxidation state?
Fluorine
Chlorine
Bromine
Iodine
Identify the compound, in which phosphorus exists in the oxidation state of +1.
Phosphonic acid (H3PO3)
Phosphinic acid (H3PO2)
Pyrophosphorus acid (H4P2O5)
Orthophosphoric acid (H3PO4)
In preparation of sulphuric acid from sulphur dioxide in lead chamber process. What substance is used as a catalyst?
Manganese dioxide
Vanadium pentoxide
Nitric oxide
Raney nickel
Which halogen has the highest value of negative electron gain enthalpy?
Fluorine
Chlorine
Bromine
Iodine
B.
Chlorine
Halogens have highest negative electron gain enthalpy in their respective periods, because they have only one electron less than stable noble gas configurations.
As a result, electron gain enthalpy becomes less negative on moving from chlorine to iodine. However, negative electron gain enthalpy of fluorine is less than that of chlorine due to small sized of fluorine atom. It has very high inter electronic repulsion in the relatively small 2p-orbitals.
Therefore, among all the given options, chlorine has the highest value of electron gain enthalpy.
Freon 12 is manufactured from CCl4 by
Wurtz reaction
Swarts reaction
Fittig reaction
Wurtz-Fittig reaction
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