Inorganic Chemistry Trends Increasing or Decreasing Order – Chemistry Mnemonics

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These Short Tricks (Mnemonics) on Inorganic Chemistry Trends Increasing or Decreasing Order are very helpful for various Medical Entrance Exam like NEET, AIIMS, JIPMER, PGIMER, CBSE Board, ICSE Board, Class 12th, 11th. Here are some mnemonic of this chapter topics listed below. These are very helpful for class 11th and 12th students :-

Inorganic Chemistry Trends Increasing or Decreasing Order

1. Stability of hydride
LiH > NaH > KH > RbH> CsH

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

3. Melting point
Li > Na > K > Rb > Cs
Li > Na > K > Rb > Cs

4. Basic nature of hydroxides
LIOH < NaOH < KOH < RbOH < CsOH

5. Hydration energy
Li> Na > K> Rb > Cs

6. Reducing character
Li > Cs > Rb > K > Na

7. Stability of +3 oxidation state
B> Al > Ga > In > T1

8. Stability of +1 oxidation state
Ga < In < TI

9. 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 <Ga > In <TI

12. Reactivity
C<Si< Ge < Sn <Pb

13. Metallic character
C< Si < Ge < Sn < Pb

14. Acidic character of the oxides
Co2 > SiO2 > Ge02 > 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 > Bi̟202

21. Acidic strength of oxides of nitrogen
N2O < NO <N2O3 <N2O4 < N2O5

22. Basic nature/ bond angle/ thermal stability and dipole moment of hydrides
NH3 > PH3 > AsH3 > SbH3 > BiH3

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

24.Lewis base strength
NF3 <NCl3 <NBr3 < NI3

25. Ease of hydrolysis of trichlorides
NCl3 > PCI3 > 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. Oxidising power
F2 > Cl2 > Br2 > I2

36. Solubility of halogen in water
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 <02 < F2 < CL2

47. Increasing size
Ca2+ < Cl- < S2-

48. Increasing acid strength
HClO < HClO2 < HClO3 < HClO4

49. Increasing oxidation number of iodine
HI< I2 <ICl <HIO4

50. Increasing thermal stability
HOCl < HOClO < HOClO2 < HOClO3

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