Q1
mcq
1 mark
Which of the following is not true about enantiomers ?
- A. They have the same density.
- B. They have the same melting or boiling point.
- C. They have the same specific rotation.
- D. They have the same chemical reactivity.
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Q2
mcq
1 mark
Aspirin is obtained by the acetylation of which of the following compounds ?
- A. Salicylaldehyde
- B. Salicylic acid
- C. Acetyl salicylic acid
- D. Phenol
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Q3
mcq
1 mark
The reactivities of the carbonyl compounds HCHO (I), CH3CHO (II) and CH3COCH3 (III) towards nucleophilic addition reaction decreases in the order :
- A. III > II > I
- B. I > II > III
- C. II > III > I
- D. I > III > II
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Q4
mcq
1 mark
Among the following, which is the strongest base ?
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Q5
mcq
1 mark
On hydrolysis, which of the following carbohydrates gives only glucose ?
- A. Starch
- B. Fructose
- C. Lactose
- D. Sucrose
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Q6
mcq
1 mark
Which of the following vitamins is water soluble ?
- A. Vitamin A
- B. Vitamin D
- C. Vitamin E
- D. Vitamin C
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Q7
mcq
1 mark
The unit of the rate of reaction is the same as that of the rate constant for a :
- A. first order reaction
- B. second order reaction
- C. zero order reaction
- D. it cannot be same
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Q8
mcq
Kohlrausch gave the following relation for strong electrolyte : = A C Which of the following equality holds true ?
- A. = as C A
- B. = as C 0
- C. = as C
- D. = as C 1
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Q10
mcq
Which of the following colligative property is used to find the molar mass of proteins ?
- A. Osmotic pressure
- B. Elevation in boiling point
- C. Depression in freezing point
- D. Relative lowering of vapour pressure
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Q11
mcq
Among the following outermost configurations of transition metals which one shows the highest oxidation state ?
- A. 3d3 4s2
- B. 3d5 4s1
- C. 3d5 4s2
- D. 3d6 4s2
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Q12
mcq
How many ions are produced in the solution from the complex [Ni(NH3)6]Cl2 ?
- A. 4
- B. 3
- C. 2
- D. 5
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Q13
mcq
Which of the following species is not expected to be a ligand ?
- A. CO
- B. + NH4
- C. NH3
- D. H2O
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Q14
mcq
Which of the following is the most stable complex species ?
- A. [Fe(C2O4)3]3
- B. [Fe(CN)6]3
- C. [Fe(CO)5]
- D. [Fe(H2O)6]3+
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Q15
mcq
Assertion (A) : Order and molecularity of a reaction are always same. Reason (R) : Complex reactions involve a sequence of elementary reactions and the slowest step is rate determining.
- A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
- B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
- C. Assertion (A) is true, but Reason (R) is false.
- D. Assertion (A) is false, but Reason (R) is true.
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Q16
mcq
Assertion (A) : Electrolysis of aqueous solution of NaCl gives chlorine gas at anode instead of oxygen gas. Reason (R) : Formation of oxygen gas at anode requires overpotential.
- A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
- B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
- C. Assertion (A) is true, but Reason (R) is false.
- D. Assertion (A) is false, but Reason (R) is true.
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Q17
mcq
Assertion (A) : Nucleophilic substitution of iodoethane is easier than chloroethane. Reason (R): Bond energy of C Cl bond
- A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
- B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
- C. Assertion (A) is true, but Reason (R) is false.
- D. Assertion (A) is false, but Reason (R) is true.
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Q18
short answer
Assertion (A): Zinc is not regarded as a transition element. Reason (R): In zinc, 3d orbitals are completely filled in its ground state as well as in its oxidised state.
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Q19
short answer
2 marks
Write the structures and IUPAC names of the products expected from the following reactions : (a) Reaction of methanal with (CH3)2CHMgBr followed by hydrolysis. (b) Reaction of phenol with conc. HNO3.
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Q20
short answer
2 marks
A chemical reaction 2N2O5 (g) -> 4NO2 (g) + O2 (g) in gas phase was carried out in a closed vessel. The concentration of NO2 was found to increase by 5 x 10^-3 mol L^-1 in 10 seconds. Calculate: (a) the rate of formation of NO2, and (b) the rate of consumption of N2O5.
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Q21
short answer
2 marks
(a) Define fuel cell and write its two advantages. OR (b) Using E values of X and Y given below, predict which is better for coating the surface of Iron to prevent corrosion and why? Given: E(X2+/X) = -2.36 V, E(Y2+/Y) = -0.14 V, E(Fe2+/Fe) = -0.44 V
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Q22
short answer
2 marks
(a) (i) How are carbohydrates stored in animal body? Mention any one organ where they are present. (ii) What is the basic structural difference between starch and cellulose? OR (b) Differentiate between: (i) Peptide linkage and Glycosidic linkage (ii) Nucleoside and Nucleotide
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Q23
short answer
2 marks
Give reasons for the following: (a) Carboxylic carbon is less electrophilic than Carbonyl carbon of aldehydes and ketones. (b) Propanal is more reactive than Propanone towards addition of HCN.
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Q24
short answer
2 marks
Write the chemical equation involved in the following reactions: (a) Carbylamine reaction (b) Gabriel phthalimide synthesis
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Q25
short answer
2 marks
Give reasons for the following: (a) Aquatic animals are more comfortable in cold water in comparison to warm water. (b) Sprinkling of salt helps in clearing the snow-covered roads in hilly areas.
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Q26
short answer
3 marks
(a) Write the mechanism of the following reaction : CH3 CH2 OH 443 K H CH2 = CH2 + H2O (b) Write the equation of the reaction for the preparation of phenol from cumene.
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Q27
long answer
3 marks
(a) Write the structures of A, B and C in the following reactions : (i) CO COOH NH3 A Br2 NaOHB 0CNaNO2HCl C (ii) CH3CH2Br KCN A LiAlH4 B 0CHNO2C OR (b) How will you convert the following : (i) Aniline to p-bromoaniline (ii) Ethanoic acid to methanamine (iii) Butanenitrile to 1-aminobutane
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Q28
short answer
3 marks
0 3 g of acetic acid (M = 60 g mol 1) dissolved in 30 g of benzene shows a depression in freezing point equal to 0 45 C. Calculate the percentage association of acid if it forms a dimer in the solution. 3 (Given : Kf for benzene = 5 12 K kg mol 1)
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Q29
short answer
3 marks
The rate of a reaction doubles when temperature changes from 27C to 37 C. Calculate energy of activation for the reaction. (R = 8 314 J K 1 mol 1) 3 (Given : log 2 = 0 3010, log 3 = 0 4771, log 4 = 0 6021)
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Q30
short answer
3 marks
Write the structure of product when D-Glucose reacts with the following : (any three) 31=3 (a) HI (b) Conc. HNO3 (c) Br2 water (d) HCN
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The polarity of C X bond of alkyl halides is responsible for their nucleophilic substitution, elimination and their reaction with metal atoms to form organometallic compounds. Alkyl halides are prepared by the free radical halogenation of alkanes, addition of halogen acids to alkenes, replacement of OH group of alcohols with halogens using phosphorus halides, thionyl chloride or halogen acids. Aryl halides are prepared by electrophilic substitution of arenes. Nucleophilic substitution reactions are categorised into SN1 and SN2 on the basis of their kinetic properties. Chirality has a profound role in understanding the SN1 and SN2 mechanism.
Q30
short answer
1 mark
Why alkyl halides are prepared by reaction with Mg?
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Q31
short answer
1 mark
Which compound will give SN1 reaction faster with OH-: (1) CH2 = CH CH2 Cl or CH3 CH2 CH2 Cl (2) (CH3)3C Cl or CH3Cl
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Q32
short answer
2 marks
Write the equation for the preparation of 1-iodobutane from: (1) 1-butanol (2) but-1-ene
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Q33
short answer
1 mark
What happens when bromobenzene is treated with Mg in the presence of dry ether ?
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Q34
short answer
1 mark
Which compound in each of the following pairs will react faster in SN1 reaction with OH? (1) CH2 = CH CH2 Cl or CH3 CH2 CH2 Cl (2) (CH3)3C Cl or CH3Cl
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Q35
short answer
2 marks
Write the structure of the major products in each of the following reactions : (1) CH3 Br | CH CH3 + KOH heat Ethanol (2) + CH3COCl Anhyd. AlCl3
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Q36
short answer
1 mark
When a coordination compound NiCl2. 6H2O is mixed with AgNO3 solution, 2 moles of AgCl are precipitated per mole of the compound. Write the structural formula of the complex and secondary valency for Nickel ion.
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Q37
short answer
1 mark
Write the IUPAC name of the ionisation isomer of [Co(NH3)5(SO4)]Cl.
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Q38
short answer
2 marks
Using Valence Bond Theory, predict the geometry and magnetic nature of : (1) [Ni(CO)4] (2) [Fe(CN)6]3 [Atomic number : Ni = 28, Fe = 26]
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Q39
short answer
2 marks
Give reasons : (1) Low spin tetrahedral complexes are not formed. (2) [Co(NH3)6]3+ is an inner orbital complex whereas [Ni(NH3)6]2+ is an outer orbital complex. [Atomic number : Co = 27, Ni = 28]
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Q40
short answer
Account for the following : (1) Transition metals form complex compounds. (2) The E(Mn/Mn2+) value for manganese is highly negative whereas E(Mn2+/Mn3+) is highly positive. (3) Cu+ ion is unstable in aqueous solution.
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Q41
short answer
5 marks
An organic compound (X) having molecular formula C5H10O can show various properties depending on its structures. Draw each of the structures if it (1) gives positive iodoform test. (2) (3)
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Q42
short answer
5 marks
Write the reaction involved in the following : (1) Wolff-Kishner reduction (2) Hell-Volhard-Zelinsky reaction
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Q43
short answer
5 marks
Write the equations involved in the preparation of KMnO4 from Pyrolusite ore (MnO2).
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Q44
short answer
Identify the following : (1) Transition metal of 3d series that exhibits only one oxidation state. (2) Transition metal of 3d series that acts as a strong reducing agent in +2 oxidation state in aqueous solution.
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Q45
short answer
Complete and balance the following equations : (1) Cr2O7 + 14H+ + 6Fe2+ (2) KMnO4 heat
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Q46
short answer
5 marks
What is Misch metal ? Write its one use.
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Q47
short answer
Calculate the emf of the following cell at 25 C : Zn (s) Zn2+ (0·1 M) H+ (0·01 M) H2 (g) (1 bar), Pt (s) [Given : E(Zn/Zn2+) = 0·76 V, E(H/H2) = 0·00 V, log 10 = 1]
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Q48
short answer
5 marks
State Kohlrausch law of independent migration of ions. Why does the conductivity of a solution decrease with dilution ?
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