Question
Explain different types of isomerism in amines.
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The rate constant for the decomposition of $N_2O_5$ at various temperatures is given below:
Draw a graph between ln $k$ and $1/T$ and calculate the values of $A$ and $E_a$. Predict the rate constant at $30^\circ$ and $50^\circ C.$
→| $T/^\circ C$ | $0$ | $20$ | $40$ | $60$ | $80$ |
| $105 \times k/s-1$ | $0.0787$ | $1.70$ | $25.7$ | $178$ | $2140$ |
What is the role of adsorption in heterogenous catalysis?
Discuss the general characteristics of Group $15$ elements with reference to their electronic configuration, oxidation state, atomic size, ionisation enthalpy and electronegativity.
→Answer the following question:
0.6mL of acetic acid $(CH_3COOH)$, having density $1.06g mL^{-1}$, is dissolved in $1$ litre of water. The depression in freezing point observed for this strength of acid was $0.0205^\circ C$. Calculate the van’t Hoff factor and the dissociation constant of acid.
→0.6mL of acetic acid $(CH_3COOH)$, having density $1.06g mL^{-1}$, is dissolved in $1$ litre of water. The depression in freezing point observed for this strength of acid was $0.0205^\circ C$. Calculate the van’t Hoff factor and the dissociation constant of acid.
- Although nitrogen and chlorine have nearly same electronegativity yet nitrogen forms hydrogen bonding while chlorine does not. Why?
- What happens when $F_2$ reacts with water?
- Write the name of the gas evolved when $Ca_3P_2$ is dissolved in water.
- Write the formula of a noble gas species which is isostructural with $IBr_2$.
- Complete the equation:
- Account for the following:
- Thermal stability of water is much higher than that of $H_2S$.
- Anhydrous aluminium chloride acts as a catalyst.
- White phosphorus is more reactive than red phosphorus.
- Draw the structures of (i) $H_3PO_3$ and (ii) $XeOF_4$.
i. Name the element of 3d transition series which shows maximum number of oxidation states. Why does it show so?
ii. which transition metal of 3 d series has positive $E ^{\circ}\left( M ^{2+} / M \right)$ value and why?
iii. Out of $Cr ^{3+}$ and $Mn ^{3+}$, which is a stronger oxidizing agent and why?
iv. Name a member of the lanthanoid series which is well known to exhibit +2 oxidation state.
v. Complete the following equation:
$MnO_4^{-}+8 H^{+}+5 e^{-} \rightarrow$
→ii. which transition metal of 3 d series has positive $E ^{\circ}\left( M ^{2+} / M \right)$ value and why?
iii. Out of $Cr ^{3+}$ and $Mn ^{3+}$, which is a stronger oxidizing agent and why?
iv. Name a member of the lanthanoid series which is well known to exhibit +2 oxidation state.
v. Complete the following equation:
$MnO_4^{-}+8 H^{+}+5 e^{-} \rightarrow$
a. Amongst the following, the most stable complex is:
i. $\left[ Fe \left( H _2 O \right)_6\right]^{3+}$
ii. $\left[ Fe \left( NH _3\right)_6\right]^{3+}$
iii. $\left[ Fe \left( C _2 O _4\right)_3\right]^{3-}$
iv. $\left[ FeCl _6\right]^{3+}$
b. What will be the correct order for the wavelength of absorption in the visible region for the following:
$
\left[Ni\left(NO_2\right)_6\right]^{4-},\left[Ni\left(NH_3\right)_6\right]^{2+},\left[Ni\left(H_2 O\right)_6\right]^{2+}
$
→i. $\left[ Fe \left( H _2 O \right)_6\right]^{3+}$
ii. $\left[ Fe \left( NH _3\right)_6\right]^{3+}$
iii. $\left[ Fe \left( C _2 O _4\right)_3\right]^{3-}$
iv. $\left[ FeCl _6\right]^{3+}$
b. What will be the correct order for the wavelength of absorption in the visible region for the following:
$
\left[Ni\left(NO_2\right)_6\right]^{4-},\left[Ni\left(NH_3\right)_6\right]^{2+},\left[Ni\left(H_2 O\right)_6\right]^{2+}
$
Derive the Nernst equation and explain how $E_{\text {cell }}^{\circ}$ depends on concentration of ions.
→Match the graph given in Column I with the order of reaction given in Column II. More than one item in Column I may link to the same item of Column II.
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Column I
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Column II
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(i)
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(ii)
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(a)
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$I^{st}$ order
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(iii)
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(b)
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Zero order
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(iv)
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