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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.
explain galvanic potentiol differnce
Q. Define Allotropic forms? All the elements of the group show allotropy. Oxygen exists in two allotropic forms. Dioxygen. 02, is a diatomic gas, paramagnetic in nature. Lewis
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Calculate the amount of heat required to raise the temperature of an 58 sample of water from 34c to 64c. Express your answer using two significant figures
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Free radical addition reactions: Those reactions that include the initial attack by a free radical are termed as free radical reactions. Inculcation of hydrogen bromide to alk
Question 1: (i) With the aid of a diagram, briefly explain the natural environmental system. (ii) Explain the green house effect, and give 2 examples of green house gases
In Bohr's model, atomic radius of the first orbit is γ the radius of the 3rd orbit, is: (1) γ/ 3 (2)γ (3) 3γ (4) 9γ Ans: 9γ
Each element has a unique number of protons. This unique number is known as the element's atomic number . All atoms of a given element have the same atomic number. For example:
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