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Q. How can we obtain Boron?
Boron is- obtained by the red-action of B2O3 with magnesium or sodium B203 is first prepared by strongly katingH3B03 which is obtained by the action of HCI or H2S04 - on a concentrated solution of borax:
NA2B4O7 + 2HCl + 5H2O------------------> 4H3BO3+ 2NaCl
2H3BO3---------------------------------> B2O3+ 3H2O
B2O3+ 3Mg------------------------------> 2B + 3MgO
Pure crystalline boron may be obtained in small quantities by the reduction of BBr3, with H2 on a heated tantalum metal filament at 1275-1475 K.
Use of the Grignard solution to prepare 2,2,6-trimethyl-5-phenylheptan-3-one: Prepare a solution of your enone (5.64 g; 0.030 moles) in dry ether (30 mL) and add it to the dro
Solubility - Physical charterstics of monocarboxylic acids The lower most members of the aliphatic carboxylic acid family (upto C 4 ) are extensively soluble in water.
why phosphene acts as ligand?
The maximum number of unpaired electron can be present in d orbitals are: (1) 1 (2) 3 (3) 5 (4) 7 Ans: 5
If wavelength of photon is 2.2x10 -11 m, h= 6.6x 10 -34 J-sec, then momentum of photon is: (1) 3x 10 -23 kgms -1 (2) 3.33x 10 22 kgms -1 (3) 1.452x 10-
Types of Substituents which Produce Directive Effect There are two kinds of substituents which generate directive effect are, (i) Those that direct the incoming group to ort
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Q. Determine the gluten content in the sample of flour? After undertaking this activity, you will be able to: • assess the gluten content the given sample of flour, • c
Physical properties of Formic Acid (a) Formic Acid is a pungent smelling and colourless liquid. (b) Formic Acid melts at 8.4° C and boils at 100.5° C . (c) Formic Acid i
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