A) neutral
B) acidic
C) basic
D) None of these
Correct Answer: B
Solution :
Chromium, molybdenum and tungsten are transition element. They are present in group VI. The maximum oxidation state of these compound is +6. In the \[Cr{{O}_{3}},\,\,Mo{{O}_{3}}\] and \[W{{O}_{3}}\]the oxidation state of Cr, Mo and W is also + 6. In general the oxides of higher oxidation states of metal are acidic in nature. Therefore, \[Cr{{O}_{3}},\,\,Mo{{O}_{3}}\] and \[W{{O}_{3}}\] are strongly acidic in nature. Note- With increase in the oxidation number, of a given transition metal, the acidic character of its compound also increases. \[\begin{align} & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,CrO\,\,\,\,\,\,\,<\,\,\,\,\,\,\,\,\,C{{r}_{2}}{{O}_{3}}\,\,\,\,\,\,\,\,\,\,\,\,\,<\,\,\,\,\,\,\,Cr{{O}_{3}} \\ & O.\,S.\,\,\,\,\,\,\,\,\,\,+2\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,+3\,\,\,\,\,\,\,\,\,\,\,\,\,\,<\,\,\,\,\,\,\,\,\,\,\,+6 \\ & \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,basic\,\,\,\,\,\,\,\,\,\,\,\,\,amphoteric\,\,\,\,\,\,\,\,\,\,\,\,\,acidic \\ & \xrightarrow[acidic\text{ }character\text{ }increase]{} \\ \end{align}\]
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