Question
What are the similarities between lanthanoids and actinoids?
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Answer
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A colorless substance ' $A$ ' $\left( C _6 H _7 N\right)$ is sparingly soluble in water and gives a water-soluble compound ' B ' on treating with a mineral acid. On reacting with CHCl 3 and alcoholic potash ' A ' produces an obnoxious smell due to the formation of compound ' C '. The reaction of ' A ' with benzene sulphonyl chloride gives compound ' D ' which is soluble in alkali. With $NaNO _2$ and HCl , ' A ' forms compound ' E ' which reacts with phenol in alkaline medium to give an orange dye ' $F$ '. Identify compounds ' $A$ ' to ' $F$ '.
→With the help of an example explain what is meant by pseudo first order reaction.
Describe the methods of studying various first order reactions with examples.
The following data were obtained during the first order thermal decomposition of SO2Cl2 at a constant volume.
$SO _2 Cl _2(g) \rightarrow SO _2(g)+ Cl _2(g)$
Calculate the rate of the reaction when total pressure is 0.65 atm.
→$SO _2 Cl _2(g) \rightarrow SO _2(g)+ Cl _2(g)$
| Experiment | time/s-1 | Total pressure/atm |
| 1 | 0 | 0.5 |
| 2 | 100 | 0.6 |
Give the structures of $A, B$ and $C$ in the following reactions :
(i) $CH _3 CH _2 I \xrightarrow{ NaCN }$$A \frac{ OH ^{-}}{\text {partial hydrolysis }} \rightarrow B$$\xrightarrow{ NaOH + Br _2} C$
(ii) $C _6 H _5 Cl \xrightarrow{ CuCN } A \xrightarrow{ H _2 O / H ^{+}} B \xrightarrow{ NH _3} C$
(iii) $CH _3 CH _2 Br \xrightarrow{ KCN } A \xrightarrow{ LiAlH _4} B \frac{ HNO _2}{0^{\circ} C } \rightarrow C$
(iv) $C _6 H _5 NO _2 \xrightarrow{ Fe / HCl } A \xrightarrow{ NaNO _2+ HCl } B$ $\xrightarrow{ H _2 O / H ^{+}} C$
(v) $CH _3 COOH \frac{ NH _3}{ Heat } \rightarrow$ A $\xrightarrow{NaOBr} B$$\xrightarrow{ NaNO _2 / HCl } C$
(vi) $C _6 H _5 NO _2 \xrightarrow{ Fe / HCl }A \frac{ HNO _2}{273 K} \rightarrow$$B \xrightarrow{ C _6 H _5 OH } C$
→(i) $CH _3 CH _2 I \xrightarrow{ NaCN }$$A \frac{ OH ^{-}}{\text {partial hydrolysis }} \rightarrow B$$\xrightarrow{ NaOH + Br _2} C$
(ii) $C _6 H _5 Cl \xrightarrow{ CuCN } A \xrightarrow{ H _2 O / H ^{+}} B \xrightarrow{ NH _3} C$
(iii) $CH _3 CH _2 Br \xrightarrow{ KCN } A \xrightarrow{ LiAlH _4} B \frac{ HNO _2}{0^{\circ} C } \rightarrow C$
(iv) $C _6 H _5 NO _2 \xrightarrow{ Fe / HCl } A \xrightarrow{ NaNO _2+ HCl } B$ $\xrightarrow{ H _2 O / H ^{+}} C$
(v) $CH _3 COOH \frac{ NH _3}{ Heat } \rightarrow$ A $\xrightarrow{NaOBr} B$$\xrightarrow{ NaNO _2 / HCl } C$
(vi) $C _6 H _5 NO _2 \xrightarrow{ Fe / HCl }A \frac{ HNO _2}{273 K} \rightarrow$$B \xrightarrow{ C _6 H _5 OH } C$
Draw all the isomers (geometrical and optical) of :
(i) $\left[ CoCl _2( en )_2\right]^{+}$
(ii) $\left[ Co \left( NH _3\right) Cl ( en )_2\right]^{2+}$
(iii) $\left[ Co \left( NH _3\right)_2 Cl _2( en )\right]^{+}$
→(i) $\left[ CoCl _2( en )_2\right]^{+}$
(ii) $\left[ Co \left( NH _3\right) Cl ( en )_2\right]^{2+}$
(iii) $\left[ Co \left( NH _3\right)_2 Cl _2( en )\right]^{+}$
What is adsorption isotherm? Describe the Freundlich adsorption isotherm.
- Give reasons for the following:
- $Mn^{3+ }$ is a good oxidizing agent.
- $ E^0 m^{2+} / M $ values are not regular for first row transition metals. $(3d$ series$)$
- Although $‘F’$ is more electronegative then $‘O’$, the highest Mn fluoride is $Mnf_4$, whereas the highest oxide is $Mn_2O_7$.
- Complete the following equations:
$\text{KMnO}_{4}\xrightarrow{heat}$
The elements of $3d$ transition series are given as:
$\ce{Sc Ti V Cr Mn Fe Co Ni Cu Zn.}$
Answer the following:
→$\ce{Sc Ti V Cr Mn Fe Co Ni Cu Zn.}$
Answer the following:
- Write the element which shows maximum number of oxidation states. Give reason.
- Which element has the highest m.p?
- Which element shows only $+ 3$ oxidation state?
- Which element is a strong oxidizing agent in $+ 3$ oxidation state and why?
Answer the following question:
The graphical representation of vapour pressures of two component system as a function of composition is given alongside. By graphic inspection, answer the following questions:
→The graphical representation of vapour pressures of two component system as a function of composition is given alongside. By graphic inspection, answer the following questions:
- Are the A-B interactions weaker, stronger or of the same magnitude as A-A and B-B?
- Name the type of deviation shown by this system from Raoult’s law.
- Predict the sign of $\Delta_\text{mix}\text{H}$ for this system.
- Predict the sign of $\Delta_\text{mix}\text{H}$ for this system.
- Give an example of such a system.
- What type of azeotrope will this system form, if possible?