MCQ
Of the following complex ions, which is diamagnetic in nature ?
- A$[NiCl_4]^{2-}$
- ✓$[Co(H_2O)_6]^{+3}$
- C$[CuCl_4]^{2-}$
- D$[CoF_6]^{3-}$
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| Column$-I$ | Column$-II$ |
| $(a)\;Co^{+3}$ | $(i)\;\sqrt{8}\; B.M.$ |
| $(b)\;Cr^{+3}$ | $(ii)\;\sqrt{35}\; B.M.$ |
| $(c)\;Fe^{+3}$ | $(iii)\;\sqrt{3}\; B.M.$ |
| $(d)\;Ni^{+2}$ | $(iv)\;\sqrt{24}\; B.M.$ |
| $(v)\;\sqrt{15}\; B.M.$ |
$(a)\quad (b)\quad (c)\quad (d)$
The half-life period is independent of the concentration of zinc at constant $pH$. For the constant concentration of $Zn$, the rate becomes $100$ times when $pH$ is decreased from $3\, to\, 2$. Identify the correct statements $(pH = -\log [H^{+}])$
$(A)$ $\frac{{dx}}{{dt}}\, = k{[Zn]^0}{[{H^ + }]^2}$
$(B)$ $\frac{{dx}}{{dt}}\, = k{[Zn]}{[{H^ + }]^2}$
$(C)$ Rate is not affected if the concentraton of zinc is made four times and that of $H^+$ ion is halved.
$(D)$ Rate becomes four times if the concentration of $H^+$ ion is doubled at constant $Zn$ concentration