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Which of the following compounds contain(s) no covalent bond(s)?

KCl,PH3,O2,B2H6,H2SO4

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Important Questions on Chemical Bonding and Molecular Structure

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According to molecular orbital theory, which of the following will not be a viable molecule? 
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According to molecular orbital theory, which of the following is true with respect to Li2+ and Li2-
HARD
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In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic?  

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The type of hybridisation and number of lone pair(s) of electrons of Xe in XeOF4, respectively, are:
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Two pi and half sigma bonds are present in:
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The hydride that is NOT electron deficient is:
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In case of nitrogen,  NCl3  is possible but not  NCl5  while in case of phosphorus,  PCl3  as well as  PCl5  are possible. It is due to

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The correct order of the thermal stability of hydrogen halides (H-X) is