The composition of 'Golden spangles' is

Match List-$I$ with List-$II$ :

List-$I$ (Elements)	List-$II$ (Properties)
$(a)$ $Ba$	$(i)$ Organic solvent soluble compounds
$(b)$ $Ca$	$(ii)$ Outer electronic configuration $6s^2$
$(c)$ $Li$	$(iii)$ Oxalate insoluble in water
$(d)$ $Na$	$(iv)$ Formation of very strong monoacidic base

Choose the correct answer from the options given below :

Which of the following reactions is incorrect regarding the hydrolysis of metal carbides?

$A$ mixture of sodium oxide and calcium oxide is dissolved in water and saturated with excess carbon dioxide gas. The resulting solution is ...... It contains ......... :

Which elements are present in the $s$-block?

The correct solubility order is/are:
$I. CaCO_3 > SrCO_3 > BaCO_3$
$II. Li_2CO_3 < Na_2CO_3 < K_2CO_3$
$III. K_2CO_3 < Rb_2CO_3 < Cs_2CO_3$
$IV. Na_2CO_3 > K_2CO_3 > Rb_2CO_3$