Complete and balance the following equation:

$$Cr_2O_7^{2-}$$ + C₂H₄O $$\to$$ C₂H₄O₂ + Cr³⁺

The principal quantum number of an atom is related to the

3 g of a salt of molecular weight 30 is dissolved in 250 g of water. The molality if the solution is _____.

Any p-orbital can accommodate upto