Read the following short write-up and answer the questions at the end of it. The name 'silica' covers an entire group of minerals, which have the general formula SiO_(2), the most common of which is quartz. Quartz is a framework silicate with SiO_(4) tetrahedra arranged in spirals. The spirals can turn in a clockwise to anticlockwise direction-a frature that results inthere being two mirror images, optically active, varieties of quartz. The following pictures represent various silicate anions. Their formulae are respectively

Read the following short write-up and answer the questions at the end

1.	Read the following short write-up and answer the questions at the end of it. The name 'silica' covers an entire group of minerals, which have the general formula SiO_(2), the most common of which is quartz. Quartz is a framework silicate with SiO_(4) tetrahedra arranged in spirals. The spirals can turn in a clockwise to anticlockwise direction-a frature that results inthere being two mirror images, optically active, varieties of quartz. The following pictures represent various silicate anions. Their formulae are respectively
Answer» `SiO_(3)^(2-) ""Si_(3)O_(7)^(2-)` `SiO_(4)^(4-) ""Si_(3)O_(10)^(8-)` `SiO_(4)^(2-) ""Si_(3)O_(9)^(2-)` `SiO_(3)^(4-) ""Si_(3)O_(7)^(8-)` ANSWER :B