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Chemistry formula for class 11 chapter- S-Block Elements

Chemistry Formulas

Class 11 chapter- S-Block Elements

  • Oxides of Li, Na, K, Rb and Cs dissolve in water to give strong alkalies. So tehse elements are known as alkali metals.
  • Among alkali metal Fr is a liquid radioactive element.
  • The lightest alkali metal is lithium.
  • Except Lithium, all other alkali metals are stored in kerosene.
  • The lowest I.P. value element among alkali metal is Cs.
  • The alkali metals used in photo electric cells are Cs and K.
  • The common oxidation state of alkali metals is +1.
  • The density of K is less than Na due to the presence of vacant 3d orbitals and greater inter atomic distance in the crystal lattice.
  • Alkali metals are highly reactive. The reactivity increases from Li to Cs.
  • The super oxide ion contains unpaired electron, so alkali metal super oxides are paramagnetic.
  • Alkali metal oxides react with water giving their hydroxides. The solubility in water increases from LiOH to CsOH.
  • Alakali metals react with H2 to give hydrides. These hydrides are ionic in nature.
  • Thermal stability of the hydrides decreases with increase in ionic nature.

Preparation of sodium hydroxide

  1. Causticizing process
  2. Electrolytic process

sodium hydroxide

Nelson Cell process

  1. Electrylyte : Brine solution (aq. NaCl)
  2. Cathode : Perforate U-shaped iron tank lined inside with asbestos
  3. Anode : Graphite rod
  4. At cathode :

cathode reaction

  • At anode : 2Cl →Cl2 + 2e

Castner-Kellner process:

  • In outer compartment – Electrolyte – Brine Solution
  • Anode-Graphite Cathode – Hg
  • Middle compartment – Electrolyte – dilute NaOH
  • Anode – Hg Cathode – Iron rods

Reaction with metals :

reaction with metal

Reaction with non-metals 

reaction with nonmetal

Do follow NCERT text book and solve questions with the help of Physics Wallah NCERT solutions for class 11 chemsitry

Download free pdf sheet which consist of formulas and important points of S-Block Elements from the link given below . 

Chemistry formula for class 11 chapter- S-Block Elements

Chemistry formula for class 11 chapter- S-Block Elements

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