MCQ
The strongest acid is
- A$HA_1\,\,(pK_a = 10)$
- B$HA_2\,\,(K_a = 10^{-4})$
- ✓$HA_3\,\,(pK_a = 2)$
- D$HA_4\,\,(K_a = 10^{-7})$
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$(A)\,Cu$ $(II)$ complexes are always paramagnetic
$(B)\,Cu$ $(I)$ complexes are generally colourless
$(C)\,Cu$ $( I )$ is easily oxidized
$(D)$ In Fehling solution, the active reagent has $Cu$ $( I )$
