Multiple Choice QuestionsWhich 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
In which one of the following compounds of xenon, highest number of lone pair of electrons is present in xenon?
XeF6
XeF4
XeF2
XeOF3
Which one of the following statements is not true in respect of propeties of interhalogen compounds?
They are all covalent compounds
They are volatile solids or liquids except ClF
IF5 has square pyramidal structure
They are all paramagnetic in nature
Which of the following noble gases has the nighest positive electron gain enthalpy value?
Helium
Krypton
Argon
Neon
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