Chemistry · 2023
JEE Main · 30 January 2023, Shift 2 · Q51
Iron oxide FeO, crystallises in a cubic lattice with a unit cell edge length of 5.0. If density of the FeO in the crystal is 4.0 g cm^-3, then the…
Iron oxide FeO , crystallises in a cubic lattice with a unit cell edge length of $\displaystyle 5.0 \AA$. If density of the FeO in the crystal is $\displaystyle 4.0 \mathrm{~g} \mathrm{~cm}^{-3}$, then the number of FeO units present per unit cell is $\displaystyle \_\_\_\_$. (Nearest integer)Given: Molar mass of Fe and O is $\displaystyle 56$ and $\displaystyle 16 \mathrm{~g} \mathrm{~mol}^{-1}$ respectively.
$$\mathrm{N}_{\mathrm{A}}=6.0 \times 10^{23} \mathrm{~mol}^{-1}
$$
Official answer
From NTA’s final answer key for this paper.
4
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JEE Main 2023 Chemistry question, with the answer from NTA’s final answer key. Where our answers come from.