List of top Chemistry Questions

(i) How would you obtain chlorobenzene from diazonium salt and aniline from chlorobenzene? (Write only chemical equation.) (2)
(ii) Write the increasing order of basicity of the following compounds: NH₃, (CH₃)₃N, CH₃NH₂, (CH₃)₂NH. (1)
(iii) What are the main sources of protein? (1)

(i) Write the electronic configuration of the following ions: (a) Cr³⁺ (b) Cu²⁺.
(ii) Write the formula of chromate and dichromate ions.

(i) Explain reduction of nitriles, with chemical reaction.
(ii) Write only the chemical equation for the reaction that occurs when aniline is heated with chloroform in the presence of alcoholic KOH.

(i) What is meant by ambidentate ligand? Give examples also. (2)
(ii) Write the IUPAC names of following compounds:
a) [Co(Br)₂(en)₂]⁺
b) K₃[Fe(C₂O₄)₃] (1+1)

Explain Aldol condensation with a chemical reaction.

What is an isotonic solution? Explain with an example.

What are the characteristics of transition metals? Why are they called transition metals?

The freezing point decreases by 0.40 K, when 1.00 g non-electrolyte is dissolved in 50 g benzene. The value of \( K_f \) for benzene is 5.12 K kg mol\(^{-1}\). Calculate the molar mass of the solute.

What is meant by the chelate effect? Give example also.

Write two reactions of phenol that demonstrate its acidic nature.

The rate constant for a first order reaction is 60 sec\(^{-1}\). How much time will it take for the reactant to reduce to 1/16th of its initial concentration?

The resistance of a conductivity cell filled with 0.1 mol L\(^{-1}\) KCl solution is 100 \( \Omega \). If the resistance of the same cell when filled with 0.02 mol L\(^{-1}\) KCl solution is 520 \( \Omega \), find the conductivity and molar conductivity of the 0.02 mol L\(^{-1}\) KCl solution. The conductivity of a 0.1 mol L\(^{-1}\) KCl solution is 1.29 S/m.

Formaldehyde reacts with KOH to give methanol and potassium formate. What is the name of the reaction?

The number of unpaired electrons in \( Cu^{2+} \) is

Chloroform is oxidised in the presence of sunlight to form

Glucose does not react with which of the following?

Which of the following is the mathematical form of Raoult's law?

Explain mole fraction. Calculate the mole fraction of ethylene glycol if 20% of the mass of ethylene glycol is present in the solution. [1+4]
OR
i) Calculate the molarity of the solution in which 5 g NaOH is dissolved in 450 mL of solution.
ii) Calculate the molality of the solution in which 2.5 g acetic acid is dissolved in 75 g benzene. [2½+2½]

Discuss the nature of bonding in \( [CoF_6]^{3-} \) and \( [Ni(CN)_4]^{2-} \) on the basis of valence bond theory (VBT) and find the value of magnetic moment in both.

OR
Explain the stereoisomerism in coordination compounds with suitable examples.

Explain molecularity and order of a reaction with the help of an example.

What are fuel cells? Draw a labelled diagram of the hydrogen–oxygen fuel cell and give the reactions that occur in the cell.

i) Write the chemical names of water soluble vitamins and the diseases caused by their deficiency.
ii) Explain the cyclic structure of glucose. [2+3]
OR
i) Explain the primary, secondary, tertiary and quaternary structures of protein.
ii) Write a note on denaturation of protein. [4+1]

Write the reagent for each of the following reactions:
i) R–OH + …… → R–Cl
ii) R–OH + …… → R–Br
iii) CH₂=CH₂ + …… → BrCH₂–CH₂Br
iv) C₆H₅–CH=CH₂ + …… → C₆H₅–CH₂–CH₂Br

Complete the following reactions:
i) \( C_6H_5COCl \xrightarrow{H_2 / Pd\text{-}BaSO_4} ? \)
ii) \( CH_3\text{-}CO\text{-}CH_2\text{-}CO\text{-}OC_2H_5 \xrightarrow{(i)\ NaBH_4\ (ii)\ H^+} ? \)
iii) anisole \( (C_6H_5OCH_3) + CH_3COCl \xrightarrow{anhydrous\ AlCl_3} ? \)
iv) acetophenone \( (C_6H_5COCH_3) + NaOH + I_2 \rightarrow \) ......
v) \( CH_3CHO + Zn\text{-}Hg + HCl \rightarrow \) ......

OR
Write short notes on the following:
i) Tollen's test
ii) Fehling test
iii) Haloform reaction of methyl ketone
iv) Reaction of phenyl methyl ketone with 2,4-dinitrophenyl hydrazine (2,4-DNP)
v) Wolff-Kishner reaction.

Write a method of preparation of diethyl ether and write the mechanism of the reaction of diethyl ether with HI.