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Q1
short answer
2 marks
Predict the products formed when CH3CH2CHO reacts with the following reagents : (Any two) (i) PhMgBr and then H3O+ (ii) LiAlH4 (iii) HCN
Q2
short answer
2 marks
Define molar conductivity for the solution of an electrolyte. How does it vary with concentration ?
Q3
short answer
2 marks
In a reaction 2N2O5 (g) 4NO2 (g) + O2 (g), the concentration of N2O5 decreases from 0·5 mol L 1 to 0·4 mol L 1 in 10 minutes. Calculate the average rate of this reaction and rate of production of NO2 during this period.
Q4
short answer
3 marks
Account for the following : (i) Transition metals and their compounds show catalytic activities. (ii) Zn, Cd and Hg are non-transition elements. (iii) Zr and Hf are of almost identical atomic radii.
Q5
short answer
3 marks
From the given E values of the first row transition elements, answer the following questions : (i) Why is Mn2+/Mn E value highly negative as compared to other elements ? (ii) What is the reason for the irregularity in the above E values ? (iii) Why is Cu2+/Cu E value exceptionally positive ?
Q6
short answer
3 marks
(a) Write three differences between Lyophobic sol and Lyophilic sol.
Q7
short answer
3 marks
(b) (i) Write the dispersed phase and dispersion medium.
Q8
short answer
3 marks
(ii) What is the cause of Brownian movement in colloidal particles ?
Q8
short answer
3 marks
A first order reduction takes 30 minutes for 75% decomposition. Calculate t1/2. Given: [log 2 = 0.3, log 3 = 0.48, log 4 = 0.6, log 5 = 0.7]
Q9
short answer
3 marks
(iii) Why does physisorption decrease with increase in temperature ?
Q10
short answer
3 marks
Why is Mn2+/Mn E value highly negative as compared to other elements ?
Q10
short answer
3 marks
Calculate the emf of the following cell : Zn(s)|Zn2+(0.01 M)||Ag+(0.001 M)|Ag(s). Given: Zn2+/Zn E=0.76 V and Ag+/Ag E=+0.80 V. [log 2=0.3010, log 3=0.4771, log 10=1]
Q11
short answer
What is the reason for the irregularity in the above E values ?
Q12
short answer
Why is Cu2+/Cu E value exceptionally positive ?
Q13
short answer
3 marks
Write the equations involved in Cannizzaro reaction.
Q14
short answer
Write the equations involved in Aldol condensation.
Q15
short answer
Write the equations involved in Hell-Volhard-Zelinsky reaction.
Q16
short answer
3 marks
Which acid of each pair would you expect to be stronger ? Give reason. (I) F-CH2-COOH or Cl-CH2-COOH (II) COOH over COOH/NO2
Q17
short answer
Distinguish between Propanal and Propanone.
Q19
short answer
3 marks
Oxidation of propanal is easier than propanone. Why ?
Q20
short answer
How can you distinguish between Acetophenone and Benzophenone ?
Q21
short answer
Draw the structure of 2,4-Dinitrophenylhydrazone of Propanone.
Q23
short answer
3 marks
Write the hybridisation and magnetic character of [NiCl4]2-
Q24
short answer
3 marks
Write the IUPAC name of the complex: [Co(NH3)4(H2O)Cl]Cl2
Q25
short answer
What is the difference between an Ambidentate ligand and a Bidentate ligand ?
Q26
short answer
Out of [Fe(NH3)6]3+ and [Fe(C2O4)3]3-, which complex is more stable and why ?
Reading Passage
Amines constitute an important class of organic compounds derived by replacing one or more hydrogen atoms of ammonia molecule by alkyl/aryl groups. Amines are usually formed from nitro compounds, halides, amides, etc. They exhibit hydrogen bonding which influences their physical properties. Alkyl amines are found to be stronger bases than ammonia. In aromatic amines, electron releasing and withdrawing groups, respectively increase and decrease their basic character. Reactions of amines are governed by availability of the unshared pair of electrons on nitrogen. Influence of the number of hydrogen atoms at nitrogen atom on the type of reactions and nature of products is responsible for identification and distinction between primary, secondary and tertiary amines. Reactivity of aromatic amines can be controlled by acylation process.
Q27
short answer
1 mark
Why does aniline not give Friedel-Crafts reaction ?
Q28
short answer
1 mark
Arrange the following in the increasing order of their pKb values : C6H5NH2, NH3, C2H5NH2, (CH3)3N
Q29
short answer
1 mark
How can you distinguish between CH3CH2NH2 and (CH3CH2)2NH by Hinsberg test ?
Q30
short answer
2 marks
(a) Write the structures of A and B in the following reactions : (I) NO2 A B (II) CH3CH2CONH2 A B OR (b) How will you convert the following : (I) Benzoic acid to aniline (II) Aniline to p-bromoaniline
