Thermal decomposition of (NH₄)₂BeF₄ is the

best route for the preparation of BeF₂

 Lithium nitrate when heated gives lithium

oxide, Li₂O, whereas other alkali metal

nitrates decompose to give the

corresponding nitrite

 Lithium unlike other alkali metals forms

no ethynide on reaction with ethyne

 The oxides and the peroxides are colourless

when pure, but the superoxides are yellow or

orange in colour

 Lithium forms monoxide, sodium forms

peroxide, the other metals form

superoxides. The superoxide   ion is

stable only in the presence of large cations

such as K, Rb, Cs.

 Double Angle Formulae

 Power-Reducing/Half Angle Formulae

 Sum-to-Product Formulae

 Product-to-Sum Formulae

SHORTCUT OF FUNCTIONS

 If f(x+y) = f(x).f(y) then f(x)=a^x







If f(x+y) = f(x)+f(y) then f(x)=kx

If f(xy) = f(x)+f(y) then f(x)=log x







If f(xy) = f(x).f(y) then f(x)=x^n







If f(x+y) = f(x)=f(y), then f(x)=k







 



If f(x+y) + f(x-y) = 2f(x)f(y) then f(x)=(a^x + a^(-x))/2

The time taken to double and triple the thickness of ice is in the ratio 

t₁ : t₂ : t₃ = 1² :2² :3²  

 The sum of the coeff. of (ax+by)ⁿ is (a+b)ⁿ

 A person of mass M climbs up a rope with acceleration 'a'. The tension in the rope will be M(g+a).

 The maximum velocity with which a vehicle can safely negotiate  a curve of radius r on a rough inclined road is given by :

v² = rg( + tan )/(1-tan) ,  is the coefficient of friction

 Hardness of water = wt. of CaCO₃ / 10⁶ g of H₂O(wt. of CaCO3 PER 10⁶ g of H₂O)