41⟩ Which group of elements is called alkaline earth metals?
1st A group because the oxides and hydrides are alkaline in nature
Bio Chemistry
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237 Bio Chemistry Questions And Answers
42⟩ Define the phenomenon resonance?
When a molecule is represented by two or more nearly equal structures, which differ in the arrangement of electrons, then the molecule is said to exhibit resonance.
43⟩ Define bond energy?
The amount of energy released when one mole of bonds are formed between the corresponding gaseous atoms is called Bond energy.
44⟩ IN XeF4, the bond angle between F-Xe-F is _________.
90 degrees
45⟩ What is the order of C-H bond length in C2H6 and C2H4 and C2H2?
c2h6>c2h4 >c2h2
46⟩ What are the units of bond length?
The intermolecular distance between the bonded atoms in a molecule is called bond length and the units are Angstrom units (A0)
47⟩ Define bond angle.
The angle between the lines joining the nuclei of the bonded atom with a central atom is called bond angle.
48⟩ Give the reason why the water molecule has high Boiling point and melting points.
Due to the presence of Hydrogen bond in water molecule
49⟩ What is the shape of molecules SF6 and IF7?
SF6 is Octahedral
IF7 is pentagonal Bipyramidal
50⟩ According to which rule the distribution of electrons into hybrid orbital takes place.
The distribution of electrons into Hybrid orbitals is as per the Paulis Exclusion principle and the Hunds rule of Maximum Multiplicity.
51⟩ How many sigma and pi bonds are present in nitrogen formula?
Each nitrogen molecule contain one sigma and 2 Pi bonds
52⟩ What are the important sources of Phosphorus?
Sources of Phosphorous are Phosphate rocks
► Flourapatite {2Ca3 (PO4)2 CaF2}
► Phosphorite {Ca3 (PO4)2}
53⟩ Name two elements, which are Non-metallic in nature in 5th A group?
Nitrogen and Phosphorous
54⟩ If a polar molecule has a charge of 4.8 * 10^ (-10) and internuclear distance is 1A then what is its dipole moment?
4.8 * 10-10 e.s.u * 1A0
4.8 * 10-10 * 10-8
4.8 * 10-18 e.s.u – Cm
= 4.8 Debye
55⟩ Give the mathematical expression to calculate or measure the percentage of ionic Character.
% of Ionic Character = (Observed dipole moment / Dipole moment of 100% ionic bond)*100
56⟩ Who proposed VSEPR theory? What does it explain?
VSEPR theory was proposed by Sedgwick and Powell. It explains the shapes of polyatomic molecules.
57⟩ In water molecule the bond angle decreases from 109.28 to 104.5, why this does happens?
The repulsion between lone pair and lone pair electrons
58⟩ Define Hybridization.
The distribution of electrons into Hybrid orbitals is as per the Paulis Exclusion principle and the Hunds rule of Maximum Multiplicity.
59⟩ Which is the most Abundant Alkaline earth element?
Calcium
60⟩ In NH3 molecule, the bond angle decreases from 109.28 to 107.3 why does it happen.
The more repulsion between lone pair and bond pair
