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Through nitrogen exhibits +5 oxidation state, it does not form pentahalide. Give reason.
What inspired N. Bartlett for carrying out reaction between Xe and PtF6?
Which of the following does not exist ?
(i) XeOF4
(ii) NeF2
(iii) XeF4
(iv) XeF6
What is the basicity of H3PO4?
Nitrogen exists as diatomic molecule and phosphorus as P4. Why ?
Deduce the molecular shape of BrF3 on the basis of VSEPR theory.
Why is H2O a liquid and H2S a gas ?
Considering the parameters such as bond dissociation enthalpy, electron gain enthalpy and hydration enthalpy, compare the oxidising power of F2 and CI2.
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.
How is SO2 an air pollutant ?
How is nitrogen prepared in the laboratory ? Write the chemical equations of the reactions involved.
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– ?
The HNH angle value is higher than HPH, HAsH and HSbH angles. Why ?
Bond angle in PH4+ is higher than that in PH3. Why ?
Although electron gain enthalpy of fluorine is less negative as compared to chlorine, fluorine is a stronger oxidising agent than chlorine. Why ?
Why are halogens coloured ?
Why does NO2 dimerise ?
How is O3 estimated quantitatively ?
Why are pentahalides more covalent than trihalides ?
Sea is the greatest source of halogens. Comment.
