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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
p Block Elements (Group 13 & 14)

NTA Abhyas 2020 · Chemistry · p Block Elements (Group 13 & 14)

Pyroxenes are class of silicate minerals, which exhibit a polymeric...

Pyroxenes are class of silicate minerals, which exhibit a polymeric chain structure, as shown below
Pyroxenes are class of silicate minerals, which exhibit a polymeric chain structure, as shown below Its simplest
Its simplest repeating unit is

Options

  1. A[SiO4]4−{[ Si{O}_{4} ]}^{4 -}
  2. B[SiO3]2−{[ Si{O}_{3} ]}^{2 -}
  3. C[Si2O7]6−{[ {Si}_{2}{O}_{7} ]}^{6 -}
  4. D[Si4O11]6−{[ {Si}_{4}{O}_{11} ]}^{6 -}

Correct answer

B. [SiO3]2−{[ Si{O}_{3} ]}^{2 -}

Step-by-step solution

In pyroxenes, there is a total of 3 oxygen atoms per silicon atom, so the simplest repeating unit is {\left[{\text{SiO}_{3}\right]}^{\text{2} -} or {\left[{\text{SiO}_{3}\right]}_n^{\text{2n} -}
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