Question

The silicate anion in the mineral kinolite is a chain of three $Si{O}_4$ tetrahedra that share corners with adjacent tetrahedra. The mineral also contains $C{a}^{2+},C{u}^{2+}$ and $H_{2}O$ in $1:1:1$ ratio.
The mineral is represented as:

• A. $CaCuS{i}_3{O}_{10}{H}_{2}O$
• B. $C{a}_{4}C{u}_{4}S{i}_3{O}_{10}4H_{2}O$
• C. $C{a}_{2}C{u}_{2}S{i}_3{O}_{10}2H_{2}O$
• D. None of the above

Answer 1

The correct option is C $C{a}_{2}C{u}_{2}S{i}_3{O}_{10}2H_{2}O$


The charge on $S{i}_3{O}_{1}0$ unit is -8. It can be balanced by two calcium ions each with +2 charge and two copper ions each with +2 charge as the ratio of the given species is $1:1:1$.