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Through nitrogen exhibits +5 oxidation state, it does not form pentahalide. Give reason.
Which of the following does not exist ?
(i) XeOF4
(ii) NeF2
(iii) XeF4
(iv) XeF6
What inspired N. Bartlett for carrying out reaction between Xe and PtF6?
Nitrogen exists as diatomic molecule and phosphorus as P4. Why ?
What is the basicity of H3PO4?
Considering the parameters such as bond dissociation enthalpy, electron gain enthalpy and hydration enthalpy, compare the oxidising power of F2 and CI2.
Why is H2O a liquid and H2S a gas ?
Deduce the molecular shape of BrF3 on the basis of VSEPR theory.
How is SO2 an air pollutant ?
Write balanced equations for the following :
(i) NaCl is heated with sulphuric acid in presence of MnO2.
(ii) Cl2 gas is passed into a solution of NaI in water.
The HNH angle value is higher than HPH, HAsH and HSbH angles. Why ?
Knowing the electron gain enthalpy values of O → O– and O → O2– as – 141 and 702 kJ mol–1 respectively, how can you account for the formation of a large number of oxides having O2– species and not O– ?
Why does NO2 dimerise ?
Why are halogens coloured ?
Bond angle in PH4+ is higher than that in PH3. Why ?
Why are pentahalides more covalent than trihalides ?
How is O3 estimated quantitatively ?
Although electron gain enthalpy of fluorine is less negative as compared to chlorine, fluorine is a stronger oxidising agent than chlorine. Why ?
Sea is the greatest source of halogens. Comment.
How is nitrogen prepared in the laboratory ? Write the chemical equations of the reactions involved.