You're viewing questions only. Log in as a Grade 12 student to reveal solutions for this paper.
Log In →
Q1
short answer
2 marks
Predict the products formed when CH3CHO reacts with the following reagents : (Any two) (i) CH3MgBr and then H3O+ (ii) Zn(Hg)/Conc. HCl (iii) Tollens' reagent
Q2
short answer
2 marks
The resistance and conductivity of a conductivity cell containing 0·001 M KCl solution at 298 K are 1200 ohm and 1·5 x 10^-4 S cm^-1. Calculate its cell constant and molar conductivity.
Q3
short answer
2 marks
A reaction is first order in X and second order in Y. (i) How is the rate affected on increasing the concentration of Y three times? (ii) How is the rate affected when the concentrations of both X and Y are doubled?
Q4
short answer
3 marks
(a) Predict the products in the following reactions: (i) CH3MgBr + CO2 -> H3O+ (ii) (a) DIBAL-H (b) H2O on CH3-C≡N (iii) Rosenmund reduction of RCOCl
Q4
short answer
3 marks
(b) Arrange the following compounds in increasing order of their property as indicated: (i) CH3CHO, CH3CH2CHO, CH3COCH2CH3, CH3COCH3 (Reactivity towards HCN) (ii) CH3COOH, ClCH2COOH, (CH3)2CHCOOH (Acidic strength) (iii) Benzoic acid, p-nitrobenzoic acid, p-methoxybenzoic acid (Acidic strength)
Q5
short answer
3 marks
(a) Write the major products in the following: (i) Benzene + acetyl chloride + AlCl3 (ii) Cannizzaro reaction of benzaldehyde (iii) Wolff-Kishner reduction of acetophenone
Q6
short answer
3 marks
Calculate the emf of the following cell: Zn(s)|Zn2+(0·01 M) || Ag+(0·001 M)|Ag(s). Given: E°(Zn2+/Zn) = -0·76 V and E°(Ag+/Ag) = +0·80 V. [log 2 = 0·3010, log 3 = 0·4771, log 10 = 1]
Q7
short answer
3 marks
(a) Write three differences between lyophobic sols and lyophilic sols.
Q7
short answer
3 marks
(b) (i) Write the dispersed phase and dispersion medium of milk. (ii) What are multimolecular colloids? (iii) What is electrophoresis?
Q8
short answer
3 marks
A first order reaction takes 30 minutes for 75% decomposition. Calculate its t1/2. Given: [log 2 = 0·3, log 3 = 0·48, log 4 = 0·6, log 5 = 0·7]
Q9
short answer
3 marks
Answer the following: (i) Transition metals and their compounds show catalytic activity. (ii) Zn, Cd and Hg are not considered transition elements. (iii) Why do transition metals show variable oxidation states?
Q12
short answer
Oxidation of propanal is easier than propanone. Why ?
Q13
short answer
How can you distinguish between Acetophenone and Benzophenone ?
Q14
short answer
Draw the structure of the following derivative : 2,4-Dinitrophenylhydrazone of Propanone
Q15
short answer
What is the cause of Brownian movement in colloidal particles ?
Q16
short answer
Why does physisorption decrease with increase in temperature ?
Q17
short answer
Transition metals and their compounds show catalytic activities. Account for this.
Q18
short answer
Zn, Cd and Hg are non-transition elements. Account for this.
Q19
short answer
Zr and Hf are of almost identical atomic radii. Account for this.
Q20
short answer
Write the hybridisation and magnetic character of the following complex: [NiCl4]2- [Atomic number : Ni = 28]
Q21
short answer
Write the IUPAC name of the following complex : [Co(NH3)4(H2O)Cl]Cl2
Q22
short answer
What is the difference between an Ambidentate ligand and a Bidentate ligand ?
Q23
short answer
Out of [Fe(NH3)6]3+ and [Fe(C2O4)3]3-, which complex is more stable and why ?
Reading Passage
M/M2+ E values: Cr(0.91), Mn(1.18), Fe(0.44), Co(0.28), Ni(0.25), Cu(+0.34), Zn(0.76)
Q24
short answer
From the given E values of the first row transition elements, answer the following: Why is E(Mn2+/Mn) value highly negative as compared to other elements ?
Q25
short answer
What is the reason for the irregularity in the above E values?
Q26
short answer
Why is E(Cu2+/Cu) value exceptionally positive?
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
