On heating anhydrous $Na_2CO_3$,........ is evolved.

Match the constituents of cements with their percentage proportion :

Constituents	Percentage
$1$. $CaO$	$a$. $2-3\%$
$2$. $MgO$	$b$. $50-60\%$
$3$. $SiO_2$	$c$. $5-10\%$
$4$. $Al_2O_3$	$d$. $20-25\%$

Match the following:

Metal	Uses
$1$. Sodium	$a$. For preparing springs
$2$. Beryllium-copper	$b$. In treatment of cancer
$3$. Radium	$c$. In preparation of aeroplanes
$4$. Magnesium-aluminium	$d$. In color industries

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

Match the following compounds with their respective uses:

Compound	Uses
$1. CaCO_3$	$a.$ In purification of coal gas
$2. Ca(OH)_2$	$b.$ As an antacid
$3. CaO$	$c.$ In paper and textile industries
$4. Na_2CO_3 \cdot 10H_2O$	$d.$ In glass and leather industries

Select the incorrect order.