MCQ
Which of the following statements is incorrect
- A$Bi^{5+}$ salts do not exist
- B$Pb^{4+}$ salts are good oxidising agents
- ✓$Sn^{4+}$ salts are good oxidising agents
- D$Tl^{+}$ salts are good oxidising agents
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$\mathrm{Li}, \mathrm{Be}, \mathrm{B}, \mathrm{C}, \mathrm{N}$
Choose the correct answer from the options given below:
| List $I$ (Coordination entity) | List $II$ (Wavelength of light absorbed in $nm$) |
| $A$ ${\left[ CoCl \left( NH _3\right)_5\right]^{2+}}$ | $I$ $310$ |
| $B$ ${\left[ Co \left( NH _3\right)_6\right]^{3+}}$ | $II$ $475$ |
| $C$ ${\left[ Co ( CN )_6\right]^{3-}}$ | $III$ $535$ |
| $D$ ${\left[ Cu \left( H _2 O \right)_4\right]^{2+}}$ | $IV$ $600$ |
Choose the correct answer from the options given below

$NH_3(g) + O_2(g) \rightarrow NO(g) + H_2O(l)$
$NO(g) + O_2(g) \rightarrow NO_2(g)$
To obtain maximum mass of $NO_2$ from a given mass of mixture $NH_3$ and $O_2$, the ratio of mass of $NH_3$ to $O_2$ should be -