Question

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

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

Answer 1

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

As it shares corner with next so it forms linear structure with $(Si{O}_3{)}_n^{-2n}$. Therefore, three unit will have total negative charge of eight and positive charge will be same, so formula is - $C{a}_{2}C{u}_{2}S{i}_3{O}_{10}.2H_{2}O$.