Identify the element for which $+1$ oxidation state is more stable than $+3$ oxidation state.

Give the preparation of phosphine $(PH_{3})$. State the physical and chemical properties of phosphine $(PH_{3})$. State the uses of phosphine.

Which statement is not correct for nitrogen?

Write a note on oxidation states of group $-15$ elements. Write a note on the nature of bonding of group $-15$ elements.

Which of the following statements is correct for $PH_3$?

The passivity of iron in concentrated nitric acid is due to