s block elements, Chemistry

what is flame coloration?
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Ionization energy of group: Why does Ionization energy of group IIA elements decrease from Be to Ra?  A. As the atomic size increases from Be to Ra, the attraction between

define hardness and its type?

Correct set of four quantum numbers for valence electron of rubidium (Z = 37) is: (1)  5,0,0,+1/2                    (2)  5, 1,0,+1/2    (3)  5,1,1,+1/2

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2. Oxalic acid is a diprotic acid with the following deprotonation equilibria. A.  You have 150 ml of a solution of pure oxalic acid with an unknown concentration.

Methods yielding mixture of amines - Hofmann's method Hofmann's method: The mixture of amines (1°, 2° and 3°) is made by the alkylation of ammonia along with alkyl halides.

why we take carbon 12 as standard?

explain ion-exchange process for slution of hard water