Which form following is a use of polyester fibres?

Calculate the solubility product of sparingly soluble salt BA at 300 K if its solubility is $9.1 \times 10^{-3} \mathrm{moldm}^{-3}$ at same temperature.

Which of the following is a pair of dihydric phenols?

Which compound is used in medicine as barium meal for intestinal x-ray?