Chemistry - CHEMICAL BONDING Question with Solution | TestHub

The selected question asks for incorrect statements about tremolite, Ca₂Mg₅[(Si₄O₁₁)₂](OH)₂.

(A) is Correct: Tremolite is a double-chain silicate belonging to the amphibole group.

(B) is Incorrect: The repeat unit formula for double-chain silicates (amphiboles) is $((S{i}_4{O}_{11}){)}_n^{6n-}$, not $((S{i}_2{O}_5){)}_n^{2n-}$ (which belongs to sheet silicates).

(C) is Incorrect: In double-chain silicates, tetrahedra share either two or three oxygen atoms; therefore, they contain one or two unshared oxygens, not strictly one.

(D) is Incorrect: It is a double-chain silicate, whereas discrete silicates refer to orthosilicates ($[Si{O}_4{]}^{4-}$) with no shared oxygens.