An acidic buffer is obtained on mixing :

For the following Assertion and Reason, the correct option is

Assertion (A): When Cu (II) and sulphide ions are mixed, they react together extremely quickly to give a solid.

Reason (R): The equilibrium constant of
Cu²⁺(aq) + S^2–(aq) ⇌ CuS(s) is high because the solubility product is low.

The solubility product of Cr(OH)₃ at 298 K is 6.0 × 10^–31. The concentration of hydroxide ions in a saturated solution of Cr(OH)₃ will be :

The K_sp for the following dissociation is 1.6 × 10^–5

$$PbC{l_{2(s)}} \leftrightharpoons Pb_{(aq)}^{2 + } + 2Cl_{(aq)}^ - $$

Which of the following choices is correct for a mixture of 300 mL 0.134 M Pb(NO₃)₂ and 100 mL 0.4 M NaCl ?