Question
Give conversion in three steps: Nitrobenzene into chlorobenzene.
✓
Answer
→Nitrobenzene into chlorobenzene
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→At $300 \mathrm{~K}, 36 \mathrm{~g}$ of glucose, $\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6$ present per litre in its solution has an osmotic pressure of $4.98$ bar. If the osmotic pressure of another glucose solution is $1.52$ bar at the same temperature, calculate the concentration of the other solution.
→How do size of particles of adsorbent, pressure of gas and prevailing temperature influence the extent of adsorption of a gas on a solid?
$i.$ Define rate constant of reaction.
$ii.$ A first order reaction takes $40$ mins for $30\%$ decomposition. Calculate $t_\frac{1}{2}.$
→$ii.$ A first order reaction takes $40$ mins for $30\%$ decomposition. Calculate $t_\frac{1}{2}.$
How would you account for the following?
i. The atomic radii of the metals of the third (5d) series of transition elements are virtually the same as those of the corresponding members of the second (4d) series.
ii. The $E ^{\circ}$ value for the $Mn ^{3+} / Mn ^{2+}$ couple is much more positive than that for $Cr ^{3+} / Cr ^{2+}$ couple or $Fe ^{3+} / Fe ^{2+}$ couple.
iii. The highest oxidation state of a metal is exhibited in its oxide or fluoride.
→i. The atomic radii of the metals of the third (5d) series of transition elements are virtually the same as those of the corresponding members of the second (4d) series.
ii. The $E ^{\circ}$ value for the $Mn ^{3+} / Mn ^{2+}$ couple is much more positive than that for $Cr ^{3+} / Cr ^{2+}$ couple or $Fe ^{3+} / Fe ^{2+}$ couple.
iii. The highest oxidation state of a metal is exhibited in its oxide or fluoride.
Explain how does the - OH group attached to a carbon of benzene ring activate it towards electrophilic substitution?
What is the significance of leaching in the extraction of aluminium?
Account for the following:
- Alkaline medium inhibits the rusting of iron.
- Iron does not rust even if the zinc coating is broken in a galvanized iron pipe.
Write names of monomer of the following polymer and classify them as addition or condensation polymer.
- Teflon.
- Bakelite.
- Natural Rubber.
Account for the following:
a. The lowest oxide of transition metal is basic, and the highest is acidic.
b. Chromium is a hard metal while mercury is a liquid metal
c. The ionisation energy of elements of the 3d series does not vary much with increasing atomic number.
a. The lowest oxide of transition metal is basic, and the highest is acidic.
b. Chromium is a hard metal while mercury is a liquid metal
c. The ionisation energy of elements of the 3d series does not vary much with increasing atomic number.