MCQ
Which of the following element has maximum density
- A$Hg$
- B$Au$
- ✓$Os$
- D$Pb$
✓
Answer
Correct option: C.
$Os$
c
Of all the metals, Osmium has the highest density of $22.59\,gm / cm ^3$.
Of all the metals, Osmium has the highest density of $22.59\,gm / cm ^3$.
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A chemist wants to determine the molecular geometry of the $[CoCl_4]^{2-}$ ion. Which of the following gives the best suggestion for a measurement and for the interpretation of that measurement ?
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→|
$A$ $(mol/l)$ |
$B$ $(mol/l)$ |
Rate |
| $0.05$ | $0.05$ | $1.2\times 10^{-3}$ |
| $0.10$ | $0.05$ | $2.4\times 10^{-3}$ |
| $0.05$ | $0.10$ | $1.2\times 10^{-3}$ |
Using the data given in find out in which option the order of reducing power is correct.
$\text{E}^\ominus_{\text{cr}_2\text{O}^{2-}_7/\text{cr}^{3+}}=1.33\text{V}\ \ \ \text{E}^\ominus_{\text{Cl}_2/\text{Cl}^-}=1.36\text{V}$
$\text{E}^\ominus_{\text{MnO}^-_4/\text{Mn}^{2+}}=1.51\text{V}\ \ \ \ \text{E}^\ominus_{\text{Cr}^{3+}/\text{Cr}}=-0.74\text{V}$
→$\text{E}^\ominus_{\text{cr}_2\text{O}^{2-}_7/\text{cr}^{3+}}=1.33\text{V}\ \ \ \text{E}^\ominus_{\text{Cl}_2/\text{Cl}^-}=1.36\text{V}$
$\text{E}^\ominus_{\text{MnO}^-_4/\text{Mn}^{2+}}=1.51\text{V}\ \ \ \ \text{E}^\ominus_{\text{Cr}^{3+}/\text{Cr}}=-0.74\text{V}$
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The correct order of ligands arranged in increasing field strength.
If $E_{{A^{ + 2}}/A}^o = - 0.30\,V$ and $E_{{A^{ + 3}}/{A^{ + 2}}}^o = 0.40\,V$ the standard $EMF$ of the reaction : $A + 2A^{+3} \to 3A+2$ will be ............ $\mathrm{V}$
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