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What are enzymes? Write in brief the mechanism of enzyme catalysis.
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Name the processes from which chlorine is obtained as a by-product.
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[NiCl4]2− is paramagnetic while [Ni(CO)4] is diamagnetic though both are tetrahedral. Why?
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[Fe(H2O)6]3+ is strongly paramagnetic whereas [Fe(CN)6]3− is weakly paramagnetic. Explain.
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Explain [Co(NH3)6]3+ is an inner orbital complex, whereas [Ni(NH3)6]2+ is an outer orbital complex.
[At. No.: Co = 27, Ni = 28]
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Write down the IUPAC name of the following complex and indicate the oxidation state, electronic configuration and coordination number. Also, give the stereochemistry and magnetic moment of the complex:
K[Cr(H2O)2(C2O4)2].3H2O
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Amongst the following ions, which one has the highest magnetic moment value?
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How the following conversion can be carried out?
Chlorobenzene to p-nitrophenol
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List the important sources of sulphur.
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Write the order of thermal stability of the hydrides of Group 16 elements.
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Why is H2O a liquid and H2S a gas?
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Which of the following does not react with oxygen directly?
Zn, Ti, Pt, Fe
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Why does NH3 form hydrogen bond but PH3 does not?
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The HNH angle value is higher than HPH, HAsH and HSbH angles. Why? [Hint: Can be explained on the basis of sp3 hybridisation in NH3 and only s−p bonding between hydrogen and other elements of the group].
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Justify the placement of O, S, Se, Te and Po in the same group of the periodic table in terms of electronic configuration, oxidation state and hydride formation.
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Knowing the electron gain enthalpy values for \[\ce{O -> O-}\] and \[\ce{O -> O^{2-}}\] 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−?
(Hint: Consider lattice energy factor in the formation of compounds).
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Why are halogens strong oxidising agents?
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Explain why inspite of nearly the same electronegativity, oxygen forms hydrogen bonding while chlorine does not.
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Give reasons:
The dipole moment of chlorobenzene is lower than that of cyclohexyl chloride.
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Arrange the following in the order of property indicated for the given set:
F2, Cl2, Br2, I2 - increasing bond dissociation enthalpy.
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