When ZnO is heated,it turns from white to yel | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) When $ZnO$ is heated,it loses oxygen and becomes non-stoichiometric: $ZnO \xrightarrow{\Delta} Zn^{2 }   \frac{1}{2} O_2   2e^-$. The excess $Zn^{

Vedclass · Accepted Answer

loses oxygen

Vedclass · Answer

(B) When $ZnO$ is heated,it loses oxygen and becomes non-stoichiometric: $ZnO \xrightarrow{\Delta} Zn^{2 }   \frac{1}{2} O_2   2e^-$. The excess $Zn^{2 }$ ions move to interstitial sites,and the electrons move to neighboring interstitial sites to maintain electrical neutrality. This creates an $F$-center-like defect,which absorbs light in the visible region,causing the substance to appear yellow.

When $ZnO$ is heated,it turns from white to yellow because it ................

Similar Questions

$F$-centres are formed in $NaCl$ crystal if it is heated with $Na$ vapour. The above is due to

The correct statement$(s)$ regarding defects in solids is/are:

The defect observed when $NaCl$ is heated in an atmosphere of sodium vapor is ................. .

If molten $NaCl$ contains $SrCl_2$ as impurity,crystallization can generate

The incorrect statement regarding defects in crystalline solid is

Vedclass Test Series

Exam Paper Generator

Online Exam Module