Selenium (Se) is similar to sulphur in its properties and francium (Fr) is an alkali metal, What is the formula for francium selenite?

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${FrSeO}_{2}$

${Fr}_{2} {Se}_{2} O_{3}$

${Fr}_{2} {SeO}_{4}$

${Fr}_{2} {SeO}_{3}$

answer is C.

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Detailed Solution

Francium is an alkali metal which is from the group 1. The element of the group 1 are Li, Na, K, Rb, Cesium and francium. The common oxidation state of all the alkali metal are +1. As we know, the selenium is showing the properties of sulphur because it also has the +1 oxidation. Hence, the formula of selenite is Seo3-2.
As we apply the crisscross rule we get, the formula for francium selenite is ${Fr}_{2} {SeO}_{3}$

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