Equilibrium

Water is well known amphoprotic solvent. In which chemical reaction water is behaving as a base?

• H₂SO₄ + H₂O → H₃O⁺ + HSO${}_4^{-}$

• H₂O + H₂O → H₃O⁺ + OH^-

• H₂O + NH${}_2^{-}$ → NH₃ + OH^-

• H₂O + NH₃ → NH${}_4^{+}$ + OH^-

Which of the following is the most basic ?

Which of the following represents the correct pH of a 10^-7 M HCl in doubly distilled air-free water?

• 6.6990

• 7.0000

• 7.3010

• 6.3980

XY₂ dissociated as XY₂(g) $\rightleftharpoons$XY(g) + Y (g) When the initial pressure of XY₂ is 600 mm Hg, the total equilibrium pressure is 800 mm Hg. Calculate K for the reaction assuming that the volume of the system remains unchanged.

• 50

• 100

• 166.6

• 400.0

Identify the Bronsted acid in the following equation

${\mathrm{PO}}_4^{3-} + {\mathrm{H}}_2\mathrm{O}\hspace{0.17em}\left(\mathrm{l}\right) \to {\mathrm{HPO}}_4^{2-} \left(\mathrm{aq}\right) + {\mathrm{OH}}^{-} \left(\mathrm{aq}\right)$

• PO${}_4^{3-}$

• HPO₄

• H₂O

• OH^-

If solubility product of Zr₃(PO₄)₄ is denoted by K_sp and its molar solubility is denoted by S, then which of the following relation between S and K_sp is correct ?

• S = ${\left(\frac{{\mathrm{K}}_{\mathrm{sp}}}{6912}\right)}^{\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$7$}\right.}$

• S = ${\left(\frac{{\mathrm{K}}_{\mathrm{SP}}}{929}\right)}^{\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$9$}\right.}$

• S = ${\left(\frac{{\mathrm{K}}_{\mathrm{sp}}}{144}\right)}^{\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$6$}\right.}$

• S = ${\left(\frac{{\mathrm{K}}_{\mathrm{sp}}}{216}\right)}^{\raisebox{1ex}{$1$}\!\left/ \!\raisebox{-1ex}{$7$}\right.}$