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አንድ የናቹራል ተማሪ ኬሚስትሪ ላይ ሊያውቃቸው የሚገቡ ፎርሙላወች

🔥Increasings or Decreasing Order🔥

🔴 01. Melting point=
Li > Na > K > Rb > Cs

🔴 02. Colour of the flame=
Li-Red, Na-Golden, K-Violet, Rb-Red, Cs-Blue, Ca-Brick red, Sr-Blood red, Ba-Apple green

🔴 03. Stability of hydrides =
LiH > NaH > KH > RbH> CsH

🔴 04. Basic nature of hydroxides=
LIOH < NaOH < KOH < RbOH < CsOH

🔴 05. Hydration energy=
Li> Na > K> Rb > Cs

🔴 06. Reducing character=
Li > Cs > Rb > K > Na

🔴 07. Stability of +3 oxidation state=
B> Al > Ga > In > T1

🔴 08. Stability of +1 oxidation state= Ga < In < TI

🔴 09. Basic nature of the oxides and hydroxides=
B< Al< Ga < In < TI

🔴 10. Relative strength of Lewis acid= BF3 < BCl3 < BBr3 < BI3

🔴 11. Ionisation energy=
B> Al In SnO2 > PbO2

🔴 15. Reducing nature of hydrides=
CH4 < SiH4  < GeH4  < SnH4 < PbH4

🔴 16. Thermal stability of tetrahalides=
CCl4> SiCl4> GeCl4> SnCl4 > PbCl4

🔴 17. Oxidising character of M+4 species=
GeCl4 < SnCl4 < PbCl4

🔴 18. Ease of hydrolysis of tetrahalides=
SiCl4 < GeCl4 < SnCl4 < PbCI4

🔴 19. Acidic strength of trioxides=
N203 > P2O3 > As2O3

🔴 20. Acidic strength of pentoxides=
N2O2 > P2O2> As202 > Sb2O2 > Bi‌202

🔴 21. Acidic strength of oxides of nitrogen=
N2O < NO AsH3 > SbH3 > BiH3

🔴 23. Stability of trihalides of nitrogen=
NF3 > NCl3 > NBr3

🔴 24.Lewis base strength=
NF3 AsCl3 > SbCl3 > BiCl3

🔴 26. Lewis acid strength of trihalides of P, As, and Sb=
PCl3 > ASCl3 > SbCl3

🔴 27. Lewis acid strength among phosphorus trihalides
PF3 > PCl3 > PBr3 > PI3

🔴 28. Melting and boiling point of hydrides=
H2O > H2Te > H2Se >H2S

🔴 29. Volatility of hydrides=
H2O < H2Te < H2Se < H2S

🔴 30. Reducing nature of hydrides=
H2S < H2Se < H2Te

🔴 31. Covalent character of hydrides=
H2O < H2S < H2Se < H2Te

🔴 32. The acidic character of oxides (elements in the same oxidation state)=
SO2 > SeO2 > TeO2 > PoO2
SO3 > SeO3  > TeO3

🔴 33. Acidic character of oxide of a particular element (e.g. S)=
SO < SO2 < SO3
SO2 > TeO2 > SeO2 > PoO2

🔴 34. Bond energy of halogens=
Cl2 > Br2 > F2 > I2

🔴 35. Solubility of halogen in water =
F2 > Cl2 > Br2 > I2

🔴 36. Oxidising power=
F2 > Cl2 > Br2 > I2

🔴 37. Enthalpy of hydration of X ion=
F- > Cl- > Br- >I-

🔴 38. Reactivity of halogens:=
F> Cl> Br > I

🔴 39. Ionic character of M-X bond in halides
= M-F > M-Cl > MBr > M-I

🔴 40. Reducing character of X ion:=
I- > Br- > Cl- > F-

🔴 41. Acidic strength of halogen acids=
HI > HBr > HCI > HF

🔴 42. Reducing property of hydrogen halides
= HF < HCL < HBr < HI

🔴 43. Oxidising power of oxides of chlorine
= Cl2O > ClO2 > Cl206 > Cl2O7

🔴 44. Decreasing ionic size=
02- > F- > Na+ > Mg2+

🔴 45. Increasing acidic property=
Na2O3 < MgO < ZnO< P205

🔴 46. Increasing bond length=
N2

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