In the structure of ClF₃ , the number of lone pairs of electrons on central atom ‘Cl’ is

Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations :

A. 60 mL $${M \over {10}}$$ HCl + 40 mL $${M \over {10}}$$ NaOH

B. 55 mL $${M \over {10}}$$ HCl + 45 mL $${M \over {10}}$$ NaOH

C. 75 mL $${M \over {5}}$$ HCl + 25 mL $${M \over {5}}$$ NaOH

D. 100 mL $${M \over {10}}$$ HCl + 100 mL $${M \over {10}}$$ NaOH

pH of which one of them will be equal to 1?

The solubility of BaSO₄ in water is 2.42 × 10^–3 g L^–1 at 298 K. The value of its solubility product (K_sp) will be (Given molar mass of BaSO₄ = 233 g mol^–1)

Which one of the following conditions will favour maximum formation of the product in the reaction
A_2(g) + B_2(g) ⇌ X_2(g) , $$\Delta $$_rH = –X kJ ?