Chemistry

BOD is the amount of oxygen required by bacteria to break down the organic matter present in a certain volume of sample of water.

Polymer Monomers
Buna-N CH? = CH – CH = CH?
and
CH? = CH – CN
Neoprene H? C = C (Cl) – CH = CH?
Nylon-6, 6 Hexamethylenediamine + Adipic Acid
PHBV CH? – CH (OH) – CH – COOH
and
CH? – CH? – CH (OH) – CH? – COOH

(A) Carbon monoxide – Haemoglobin
(B) Sulphur dioxide – Stiffness of flower buds
(C) Polychlorinated biphenyls – Carcinogenic
(D) Oxides of nitrogen – Metabolized by pyrus plants

Due to I, ClO? > BrO? > IO? (stability)

Inversion + Inversion = Retention

(H? S + dil HCl) is 2nd group reagent so Cu²? get precipitated as CuS.

[Mn (CN)? ]³? → Mn³? i.e 3d? → t? g? , eg? (d²sp³), CN? is strong field ligand.
[Fe (CN)? ]³? → Fe³? i.e 3d? → t? g? , eg? (d²sp³), CN? is strong field ligand.
[Co (C? O? )? ]³? → Co³? i.e, 3d? → t? g? , eg? (d²sp³), C? O? ²? is strong field ligand.
[MnCl? ]? → Mn³? = 3d? → t? g²¹¹¹, eg¹¹? (4 unpaired e? ), Cl? is weak field ligand.
[FeF? ]³? → Fe³? = 3d? → t? g³¹¹, eg²¹¹ (5 unpaired e? ) F? is strong field ligand.
∴ S? and S? are true.

Order of 1st I. E is Al < Mg < S < P

Radioactive isotope of hydrogen is tritium (³H)
Number of neutron = 3 - 1 = 2
Number of electron = 1

In hexagonal unit cell, the shortest distance between two identical layers is
(2√2x) / √3 [x = edge length]

h = (2√2x) / √3