In which among the following compounds, oxidation number of nitrogen is +5 ?

18 gram glucose (Molar mass $=180$ ) is dissolved in 100 ml of water at 300 K . If $R=3$ $0.0821 \mathrm{~L}{-\mathrm{a t m}} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$ what is the osmotic pressure of solution?

A flavouring agent found in oil of wintergreen is

Which of the following is not the mineral of iron?