Increasing or Decreasing Order</chem>

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

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 2O₃ 2O₄ < 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 3 3 < 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. 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
0^2- > F^- > Na⁺ > Mg²⁺

45 Increasing acidic property
Na₂O₃ < MgO < ZnO< P₂₀₅

46 Increasing bond length
N₂ <02 < F₂ < CL₂

47 Increasing size
Ca²⁺ < Cl^- < S^2-

48 Increasing acid strength
HClO < HClO₂ < HClO₃ < HClO₄

49 Increasing oxidation number of iodine
HI< I₂ 4

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