$MnO$ exhibits

Soldiers of Napoleon's army while at the Alps during a freezing winter suffered a serious problem regarding the tin buttons of their uniforms. White metallic tin buttons got converted to grey powder. This transformation is related to

Silicon is found in nature in the form of

The value of the heat of fusion of $NaCl$ is:

Which type of impurity is added to form a $p$-type semiconductor?

In a crystal,the atoms are located at the position of