Question

Identify the incorrect statement:

• A. The oxidation state of chromium in $Cr{O}_4^{2–}\text{\&}C{r}_2{O}_7^{2–}$ are not the same.
• B. $C{r}^{2+}$ is stronger reducing agent than $F{e}^{2+}$ in water
• C. Interstitial compounds are those that are formed when small atoms like $H,CorN$ are trapped inside the crystal lattices of metals.
• D. The transition metals and their compounds are known for their catalytic activity due to their ability to adopt multiple oxidation states and to form complexes.

Answer 1

The correct option is A The oxidation state of chromium in $Cr{O}_4^{2–}\text{\&}C{r}_2{O}_7^{2–}$ are not the same.

1) Interstitial compounds are those compounds that are formed when small atoms like $H,B,CorN$ are trapped inside crystal lattices of metals.
(2) Oxidation state of chromium in $Cr{O}_4^{2–}\text{\&}C{r}_2{O}_7^{2–}$ are +6 (same)
(3) Fact $C{r}^{2+}$ is stronger reducing agent than $F{e}^{2+}$ in water on the basis of standard reduction potential.
(4) Transition metals are one of the best available catalyst due to their ability to adopt multiple oxidation states & to form complexes