81⟩ How do we prepare Diborane?
The Diborane (B2H6) is prepared by the reduction of BCl3 with aluminium hydride
B2H6+3AlCl3+3LiClà4 BCl3+3LiAlH4
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237 Bio Chemistry Questions And Answers
82⟩ What are hydrides of boron called?
Boranes
83⟩ How much amount of energy is required to break the Triple bond in nitrogen molecule?
225 Kcal/mole or 945.4 KJ/mole
84⟩ Which Univalent element cannot form Alums and why?
Lithium (Li+) does not produce alums because of its very small size.
85⟩ What is Thermite mixture?
A mixture of Fe2O3 and ammonium powder in 3:1 ratio is called Thermite mixture.
86⟩ What does Ammonal contain? For what purpose it is used.
It is a mixture of ammonium nitrate and aluminium powder is called ammonal, which is used as an explosive in Bombs.
87⟩ What is the process, by which Aluminium is refined?
By Hoope’s process
88⟩ What is Banana bond? Diborane contains how many banana bonds
In Diborane B-H-B, bridge, which is formed by the sharing of two electrons, is called banana bond or Tau bond Diborane contains two banana bonds.
89⟩ Garnet is the ore of which element. Give its chemical formula.
Garnet is Silicate ore of Aluminium
(MgFe) 3 AlSi3O2.
90⟩ What is Allotropy?
Allotropy is Nitric acid
91⟩ Why the transition metal ions or compounds exhibit color?
Due to incomplete partially filled d- orbitals
92⟩ The bond formed between the transition metal ion and ligand is?
Co-ordination covalent bond
93⟩ In which oxidation state chromium exhibit different color?
Chromium is Blue in +2 states, Green in +3 states and Yellow in +6 state.
94⟩ Magnetic property exhibited by which of the following element? Fe, Co, Ni
Ferro magnetic
95⟩ What is the element in third series the element with maximum oxidation state?
Mn – manganese -+7-oxidation state
96⟩ Why FE3+ ion is more stable than Fe2+ ion is?
Because of stable, half filled 3 d5 electronic configurations in fe3+
97⟩ In transition series the element with maximum Ionization energy is.
Zinc – due to stable electronic configuration
98⟩ What is the formula of Hypo in Oxidation state of sulphur?
The formula of Sodium Thio Sulphate is Na2S2O3. H2O is called as hypo Oxidation state of Sulphur in it is +6 0r -2
99⟩ How many elements are there in 3d-series of first transition series?
Ten elements from Sc (Z=21) to Zn (z=30) or {Sc –scandium to Zn (zinc)}
100⟩ Oil of Vitriol and king of chemicals is called.
H2SO4 Sulphuric acid
