Match the constituents of cements with their percentage proportion :
Constituents Percentage $1$. $CaO$ $a$. $2-3\%$ $2$. $MgO$ $b$. $50-60\%$ $3$. $SiO_2$ $c$. $5-10\%$ $4$. $Al_2O_3$ $d$. $20-25\%$
| Constituents | Percentage |
| $1$. $CaO$ | $a$. $2-3\%$ |
| $2$. $MgO$ | $b$. $50-60\%$ |
| $3$. $SiO_2$ | $c$. $5-10\%$ |
| $4$. $Al_2O_3$ | $d$. $20-25\%$ |
(A) The average composition of Portland cement is as follows:
$1$. $CaO$: $50-60\%$
$2$. $SiO_2$: $20-25\%$
$3$. $Al_2O_3$: $5-10\%$
$4$. $MgO$: $2-3\%$
Therefore,the correct matching is $1-b, 2-a, 3-d, 4-c$.
$1$. $CaO$: $50-60\%$
$2$. $SiO_2$: $20-25\%$
$3$. $Al_2O_3$: $5-10\%$
$4$. $MgO$: $2-3\%$
Therefore,the correct matching is $1-b, 2-a, 3-d, 4-c$.
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