Important Increasing Order 🌱

✔️ BOND ANGLE :-
(i) CH4 , C2H4 , C2H2
(ii) H2O, NH3 , CH4 , CO2
(iii) H2O, NH3 , CH4 , BH3
(iv) NO2—, NO2 , NO2+
(v) H2Se, H2S, H2O
(vi) AsH3 , PH3 , NH3
(vii) PF3 , PCl3 , PBr3 , PI3
(viii) NF3 , NCl3
(ix) NF3 , NH3 , NCl3
(x) OF2 , OH2 , Cl2O

✔️ MELTING POINT :-
(i) Cs, Rb, K, Na, Li
(ii) Mg, Ba, Sr, Ca, Be
(iii) CaI2 , CaBr2 , CaCl2 , CaF2
(iv) BeCl2 , MgCl2 , CaCl2 , SrCl2 , BaCl2
(v) NaI, NaBr, NaCl, NaF
(vi) CsCl, RbCl, KCl, NaCl
(vii) AlCl3 , MgCl2 , NaCl

✔️ BOILING POINT :-
(i) PH3 , AsH3 , NH3 , SbH3
(ii) H2S, H2Se, H2O
(iii) HCl, HBr, HI, HF
(iv) NH3 , HF, H2O
(v) He, Ne, Ar, Kr
(vi) H2O, D2O
(vii) H2 , Cl2 , Br2

✔️ DIPOLE MOMENTS :-
(i) CCl4 , CHCl3 , CH2Cl2 ,CH3Cl
(ii) NF3 , NH3 , H2O, HF
(iii) Cis-chloropropene, Trans-chloropropene
(iv) p, m, o-dichlorobenzene
(v) CH3I, CH3Br, CH3F, CH3Cl
(vi) NH3 , SO2 , H2O, HF
(vii) H2S, H2O
(viii) HI, HBr, HCl, HF
(ix) PH3 , ASH3 , SbH3 , NH3
(x) H2O, H2O2.

Fig.: A diagram of a section of an alveolus with a pulmonary capillary

𝗘𝗫𝗖𝗛𝗔𝗡𝗚𝗘 𝗢𝗙 𝗚𝗔𝗦𝗘𝗦

Alveoli are the primary sites of exchange of gases.

Gaseous Exchange in Lungs

● At alveoli level, gaseous exchange occur through respiratory membrane (diffusion membrane) which is 0.2 mm thick (total thickness is much less than a mm).

● 𝗜𝘁 𝗰𝗼𝗻𝘀𝗶𝘀𝘁 𝗼𝗳 𝘁𝗵𝗿𝗲𝗲 𝗹𝗮𝘆𝗲𝗿𝘀:

(i) Alveolar epithelium (thin squamous epithelium)

(ii) Basement substance in between them (composed of a thin basement membrane supporting the squamous epithelium and the basement membrane surrounding the single layer endothelial cells of capillaries)

(iii) Endothelium of alveolar blood capillaries

● Exchange of gases also occur between blood and tissues.

● O2 and CO2 are exchanged in these sites by simple diffusion mainly based on pressure/concentration gradient

● Pressure contributed by an individual gas in a mixture of gases is called partial pressure and is represented as pO2 for oxygen and pCO2 for carbon dioxide.

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