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Q. Explain about Preparation of diborane?
Diborane can be prepared in almost quantitative yields by the reduction of boron Tricloride etherate (BF3, 0Et2) with lithium aluminium hydride (LiAIH4,) or sodium borohydride (NaBH4,):
where diglyme is diethyleneglycol dimethyl ether, (MeOCH2,CH2) 20. Diborane can also be prepared by treating NaBH4, with conc. H2SO4 or H3PO4.
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Q. Define about Crystal Field Theory? This theory is based on two main assumptions. First, all the ligands are considered as point (negative) charges. It means that the size an
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Bond formed in crystal by anion and cation is: (1) Ionic (2) Metallic (3) Covalent (4) Dipole Ans: Ionic
Low-grade phosphate rock can be upgraded by flotation processing. In this process the low-grade rock is grounded into a powder and suspended as a water slurry. The addition of smal
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