The major product obtained from the following reaction is :

Among the sulphates of alkaline earth metals, the solubilities of BeSO₄ and MgSO₄ in water, respectively, are :

The presence of soluble fluoride ion upto 1 ppm concentration in drinking water, is :

Consider the following reactions

A $$ \to $$ P₁ ; B $$ \to $$ P₂ ; C $$ \to $$ P₃ ; D $$ \to $$ P₄,

The order of the above reactions are a, b, c, and d, respectively. The following graph is obtained when log[rate] vs. log[conc.] are plotted
Among the following, the correct sequence for the order of the reactions is :