Q l.
Balance the following redox reaction in an acidic medium by the ion-electron method
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When a fewSi atoms are replaced by P atoms in pure crystal of Si, what is the consequence in the physical property

The effective magnetic moment of

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Is it higher or lower or equal to the
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value? Provide an explanation. Provide an explanation.


Identify the organometallic compound which obeys the 18 electron rule.

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Why are nuclei having 'Magic Number' of nucleons exceptionally stable?

Draw the structure of dimethyl beryllium and explain the bonding.

Nowadays CFC (Chlorofluorocarbon)-free refrigerators are promoted in the market. Why and what is the consequence upon release of CFCs to atmosphere? [Write only relevant reactions]

Compared to other actinides, why have the chemical properties of Th and U been extensively developed
and U been extensively developed

Find the oxidation states of

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The radii of Mo 42) and W(Z 74) are 140 and 141 pm, respectively, despite the latter having many more electrons. Provide an explanation.



Q2.
Using a VSEPR model, arrive at and draw the shape of
XeO2F2 and SO2Cl2
In going from left to right of the 1st transition series for bivalent ions, the Lewis acidity steadily increases. Justify your answer.

Iodine behaves differently in iodometric and iodimetric titrations. Provide an explanation.


Q3. In the estimation of iron. copper and gold, three chemical methods are employed. Comment on these methods and explain with the chemical reactions involved in the extraction of these metals.

Write the product(s) formed from the following reactions and balance the equation:

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Q4. Draw the structures of

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(en=1,2-diaminoethane)

Identify the presence or absence of Jahn-Teller distortion in
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Justify your answer.


Determine the spectroscopic ground-states of
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Q5. When an aqueous solution of
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is reacted with sodium nitrite and sodium thiocyanate separately, four new complexes could be isolated.
Draw the structure of the new complexes. What is the nature of the incoming ligands


Among the following complexes, which one assumes perfect octahedral geometry. Justify your answer.

src='./qimages/7973-5b.jpg'>

From the following two complexes, identify the complex which is kinetically labile or kinetically inert:

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Q6. Using MO diagrams, explain why B2 is paramagnetic and C2 is diamagnetic.

Write the balanced chemical reaction between Br2, and HCl with

benzene and borazine. Comment on the reactivity pattern.

B Br bond of BBr3 is a single bond; however, B F bond of BF3 is between a single and a double bond. Rationalize the observation.


Q7. B2O3 is acidic where as Al2O3 amphotaric. Rationalize your answer.

Draw the structures of P4O6 and P4O10


How is (Me2SiO)n prepared starting from methyl chloride and silicon using copper as a catalyst

What are the applications of silicones



Q8. Predict the number of metal-metal bonds present in the following organometallic compounds

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What is Zeise's salt Explain its metal-ligand bonding interactions.


Q9. While chromium hexacarboxyl exists as a monomer, manganese carbonyl forms a dimer. Rationalize your answer.

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Predict the products and of the following nucleophilic addition

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Q10. NaCl and NaOH cannot be used in place of NH4Cl and NH4OH for the precipitation of Group III A metal ions in qualitative group analysis. Provide an explanation.

Nuclear stability is associated with packing fraction. Provide an explanation.

Lanthanides typically display weak but sharp absorption bands. Explain.


Qll. In qualitative inorganic analysis, H2S is passed in acidic medium for Group ll metal ions while for Group III B metal ions the same is passed in basic medium. Provide an explanation in basic medium. Provide an explanation.

Aqueous solutions of potassium permanganate exhibit very intense electronic transition at 530 nm. What is the nature of this transition Justify your answer.

Write the ground state term symbols (LS coupling) for d^1 octahedral and d^9 octahedral