Beryllium and Magnesium do not give colour to flame whereas other alkaline earth metals do so why?

They are better reducing agent than C and CO. 

It is due to high polarising power of Be cation its compound are covalent in nature

(i) Ionisation enthalpy: The first ionisation enthalpies of alkaline earth metals are higher than those ) of alkali metal because of increased nuclear charge, However 2nd ionisation enthalpies of alkaline...

Alkali and alkaline earth metals cannot be obtained by chemical reduction methods because they are very strong reducing agent and highly reactive metals. Because of this they can not be reduced by any other substance very easily.

On heating an alkali earth metal or its salt, the electrons are excited easily to higher energy levels because of absorption of energy. When these electrons return to their ground...

Thermal stability: - Carbonates: - The carbonates of alkali metals except lithium carbonate are stable towards heat. The carbonates of alkaline earth metals and Lithium carbonate decompose on heating to form...

(c) either metals or non-metals 

Number of moles 12 / 24 = 0.5 mol 

(i) The inlets for air in stove get blocked which leads to yellow flame. (ii) This problem is harmful for our environment as incomplete combustion results in the formation of oxides...

i. The reaction in which one reactant gets oxidised and the other reactant gets reduced is called redox reaction. ii. When a magnesium ribbon burns in air with a dazzling flame...