Question
Read the passage given below and answer the following questions:
Transition metal oxides are compounds fanned by the reaction of metals with oxygen at high temperature. The highest oxidation number in the oxides coincides with the group number. In vanadium, there is a gradual change from the basic $V_2O_3$ to less basic $V_2O_4$ and to amphoteric $V_2O_5· V_2O_4$ dissolves in acids to give $VO^{2+}$ salts. Transition metal oxides are commonly utilized for their catalytic activity and semi conductive properties. Transition metal oxides are also frequently used as pigments in paints and plastic. Most notably titatnium dioxide. One of the earliest application of transition metal oxides to chemical industry involved the use of vanadium oxide for catalytic oxidation of sulfur dioxide to sulphuric acid. Since then, many other applications have emerged, which include benzene oxidation to maleic anhydride on vandium oxides; cyclohexane oxidation to adipic acid on cobalt oxides. An important property of the catalyst material used in these processes is the ability of transition metals to change their oxidation state under a given chemical potential of reductants and oxidants.
The following questions are multiple choice questions. Choose the most appropriate answer:
Transition metal oxides are compounds fanned by the reaction of metals with oxygen at high temperature. The highest oxidation number in the oxides coincides with the group number. In vanadium, there is a gradual change from the basic $V_2O_3$ to less basic $V_2O_4$ and to amphoteric $V_2O_5· V_2O_4$ dissolves in acids to give $VO^{2+}$ salts. Transition metal oxides are commonly utilized for their catalytic activity and semi conductive properties. Transition metal oxides are also frequently used as pigments in paints and plastic. Most notably titatnium dioxide. One of the earliest application of transition metal oxides to chemical industry involved the use of vanadium oxide for catalytic oxidation of sulfur dioxide to sulphuric acid. Since then, many other applications have emerged, which include benzene oxidation to maleic anhydride on vandium oxides; cyclohexane oxidation to adipic acid on cobalt oxides. An important property of the catalyst material used in these processes is the ability of transition metals to change their oxidation state under a given chemical potential of reductants and oxidants.
The following questions are multiple choice questions. Choose the most appropriate answer:
- Which oxide of vanadium is most likely to be basic and ionic?
- $VO$
- $V_2O_3$
- $VO_2$
- $V_2O_5$
- Vanadyl ion is:
-
$\text{VO}^{2+}$
-
$\text{VO}^{+}_2$
-
$\text{V}_{2}\text{O}^+$
-
$\text{VO}^{3-}_4$
- Which of the following statements is false?
- With fluorine vanadium can form $VF_5.$
- With chlorine vanadium can form $VCl^5.$
- Vanadium exhibits highest oxidation state in oxohalides $VOCl_3, VOBr_3$ and fluoride $VF_5.$
- With iodine vanadium cannot form $Vl_5$ due to oxidising power of $V^{5+}$ and reducing nature of $I^-.$
- The oxidation state of vanadium in $V_2O_5$ is:
- $\frac{+5}{2}$
- $+7$
- $+5$
- $+6$
- Identify the oxidising agent in the following reaction.
- $V_2O_5$
- $Ca $
- $V$
- None of these.
