CHEMISTRY [POINTS TO REMEMBER] (CBSE)

POINTS TO REMEMBER

  1.  Melting point=Li > Na > K > Rb > Cs
  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. Stability of hydrides =LiH > NaH > KH > RbH> CsH
  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 In SiO2 > Ge02 > SnO2 > PbO2
  12. Reducing nature of hydrides=CH4 < SiH4 < GeH4 < SnH4 < PbH4
  13.  Thermal stability of tetrahalides=CCl4> SiCl4> GeCl4> SnCl4 > PbCl4
  14. Oxidising character of M+4 species=GeCl4 < SnCl4 < PbCl4
  15. Ease of hydrolysis of tetrahalides=SiCl4 < GeCl4 < SnCl4 < PbCI4
  16. Acidic strength of trioxides=N203 > P2O3 > As2O3
  17.  Acidic strength of pentoxides=N2O2 > P2O2> As202 > Sb2O2 > Bi̟202
  18. Acidic strength of oxides of nitrogen=N2O < NO PH3 > AsH3 > SbH3 > BiH3
  19.  Stability of trihalides of nitrogen=NF3 > NCl3 > NBr3
  20. Lewis base strength=NF3 PCI3 > AsCl3 > SbCl3 > BiCl3
  21. Lewis acid strength of trihalides of P, As, and Sb=PCl3 > ASCl3 > SbCl3
  22.  Lewis acid strength among phosphorus trihalidesPF3 > PCl3 > PBr3 > PI3
  23. Melting and boiling point of hydrides=H2O > H2Te > H2Se >H2S
  24.  Volatility of hydrides=H2O < H2Te < H2Se < H2S
  25. Reducing nature of hydrides=H2S < H2Se < H2Te
  26.  Covalent character of hydrides=H2O < H2S < H2Se < H2Te
  27.  The acidic character of oxides (elements in the same oxidation state)=SO2 > SeO2 > TeO2 > PoO2SO3 > SeO3 > TeO3
  28.  Acidic character of oxide of a particular element (e.g. S)=SO < SO2 < SO3.SO2 > TeO2 > SeO2 > PoO2
  29. Bond energy of halogens=Cl2 > Br2 > F2 > I2
  30. Solubility of halogen in water =F2 > Cl2 > Br2 > I2
  31. Oxidising power=F2 > Cl2 > Br2 > I2
  32.  Enthalpy of hydration of X ion=F- > Cl- > Br- >I-
  33. Reactivity of halogens:=F> Cl> Br > I
  34.  Ionic character of M-X bond in halides= M-F > M-Cl > MBr > M-I
  35.  Reducing character of X ion:=I- > Br- > Cl- > F-
  36.  Acidic strength of halogen acids=HI > HBr > HCI > HF
  37. Reducing property of hydrogen halides= HF < HCL < HBr < HI
  38. Oxidising power of oxides of chlorine= Cl2O > ClO2 > Cl206 > Cl2O7
  39.  Decreasing ionic size=02- > F- > Na+ > Mg2+
  40.  Increasing acidic property=Na2O3 < MgO < ZnO< P205
  41. Increasing bond length=N2 <02 < F2 < CL2
  42. Increasing size=Ca2+ < Cl- < S2-
  43.  Increasing acid strength=HClO < HClO2 < HClO3 < HClO4
  44.  Increasing oxidation number of iodine=HI< I2
  45. RCOCl > RCOOCOR > RCOOR > RCONH2 Nucleophilic substitution reaction.
  46. HI > HBr > HCl > RCOOH > C6H5OH > H2O > CH CH > NH3 (Acidic nature)
  47. CCl3CHO > HCHO > CH3CHO > CH3COCH3 Nucleophilic addition reaction.
  48. CH2 = CH2 > CH CH > C6H6 Electrophilic addition reaction.
  49.  (CH3)2C = C(CH3)2 > CH3 – CH = C -(CH3)2 > CH3 – CH = CH – CH3 > CH3 – CH = CH2 (Stability)
  50. NI3 > NBr3 > NCl3 > NF3 (Basic strength)

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