Q1
mcq
1 mark
In the ring structure of fructose, the anomeric carbon is
- A. C – 1
- B. C – 2
- C. C – 3
- D. C – 5
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Q2
mcq
1 mark
Which of the following is the correct expression of Kf which depends upon the nature of solvent?
- A. Kf = (R × M1 × Tf^2) / (1000 × ΔfusH)
- B. Kf = (R × M1 × ΔfusH) / (1000 × Tf^2)
- C. Kf = (R × Tf^2 × ΔfusH) / (1000 × M1)
- D. Kf = (R × M1 × Tf^2) / (1000 × ΔfusH)
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Q3
mcq
1 mark
Which of the following transition metals has lowest enthalpy of atomisation?
- A. Cr
- B. V
- C. Mn
- D. Fe
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Q4
mcq
1 mark
Which of the following curve represents the first order reaction?
- A. (A)
- B. (B)
- C. (C)
- D. (D)
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Q5
mcq
1 mark
Aniline on direct nitration yields
- A. 51%-ortho, 47%-para, 2%-meta derivatives
- B. 51%-meta, 47%-ortho, 2%-para derivatives
- C. 51%-para, 47%-meta, 2%-ortho derivatives
- D. 51%-ortho, 47%-meta, 2%-para derivatives
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Q6
mcq
1 mark
Which of the following is ‘not’ true about enantiomers ?
- A. They have the same chemical reactivity.
- B. They have the same specific rotation.
- C. They have the same melting or boiling point.
- D. They have the same refractive index.
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Q7
mcq
1 mark
The secondary valency of Co in [Co(en)3 ]3+ is
- A. 4
- B. 3
- C. 5
- D. 6
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Q8
mcq
1 mark
At low temperature, phenol on reaction with Br2 in CS2 gives
- A. 2, 4, 6-Tribromophenol
- B. a mixture of ortho-and para-bromophenol
- C. ortho-bromophenol only
- D. para-bromophenol only
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Q9
mcq
1 mark
How the conductivity varies on decreasing concentration for both weak and strong electrolytes ?
- A. It increases for weak electrolyte and decreases for strong electrolyte.
- B. It decreases for weak electrolyte and increases for strong electrolyte.
- C. It increases for both weak and strong electrolytes.
- D. It decreases for both weak and strong electrolytes.
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Q10
mcq
1 mark
CH3 – NH2 on reaction with (CH3CO)2O gives
- A. CH3CONH2
- B. CH3COONHCH3
- C. CH3 – NH – O||C – CH3
- D. CH3 – O||C – CH2 – NH2
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Q11
mcq
1 mark
The activation energy of a reaction can be determined from the slope of which of the following curves ?
- A. lnk vs. T
- B. lnk vs. 1/T
- C. ln(k/T) vs. T
- D. Tlnk vs. 1/T
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Q12
mcq
1 mark
Identify ‘X’ in the following reaction : CH3 – O||C – CH2 – O||C – O – CH3 NaBH4 ‘X’
- A. CH3 – O|CH – CH2 – O||C – O – CH3
- B. CH3 – O||C – CH2 – CH2 – OH
- C. CH3 – O|CH – CH2 – CH2 – OH
- D. CH3 – O|CH – CH2 – COOH
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Q13
short answer
1 mark
Assertion (A) : The presence of –OH group in phenols directs the incoming group at ortho- and para- positions. Reason (R) : –OH group in phenols deactivates the aromatic ring.
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Q14
short answer
1 mark
Assertion (A) : Actinoids show irregularities in their electronic configurations. Reason (R) : Due to varying stabilities of f0, f7 and f14 occupancies of the 5f orbitals.
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Q15
short answer
1 mark
Assertion (A) : The pentaacetate of glucose does not react with H2N – OH. Reason (R) : It indicates the absence of free –CHO group in glucose.
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Q16
short answer
1 mark
Assertion (A) : It is not possible to separate the components of an azeotrope by fractional distillation. Reason (R) : Minimum boiling azeotrope is formed by the solutions showing large positive deviation from Raoult’s law.
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Q17
short answer
2 marks
What type of deviation is shown by a mixture of chloroform and acetone from Raoult’s law ? Give reason. What will happen to the boiling point of the solution on mixing chloroform and acetone ?
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Q18
short answer
2 marks
Following reaction takes place in one step : 2A + B — 2C. How will the rate of above reaction change if the volume of the reaction vessel is decreased to one third of its original volume ? Will there be any change in the order of reaction with the reduced volume ?
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Q19
short answer
2 marks
Write IUPAC names of the following coordination compounds : (i) [Ag(NH3)2] [Ag(CN)2] (ii) K3[Fe(C2O4)3]
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Q20
short answer
2 marks
(i) Give a chemical test to show that [Co(NH3)5SO4]Cl and [Co(NH3)5Cl]SO4 are ionisation isomers. (ii) What is meant by the ‘Chelate effect’ ? Give an example.
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Q20
short answer
2 marks
Distinguish between the following : (i) Fibrous protein and globular protein (ii) Peptide bond and phosphodiester bond
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Q21
short answer
2 marks
Why are haloarenes less reactive towards nucleophilic substitution reaction ? Give two reasons.
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Q22
short answer
3 marks
Calculate the boiling point of a solution containing 0.61 g of benzoic acid (Molar mass = 122 g mol–1) in 5 g of CS2 in which it dimerises to the extent of 88%. The boiling point and Kb of CS2 are 46.2 C and 2.3 K kg mol–1 respectively.
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Q23
short answer
1 mark
Write IUPAC name of [Ag(NH3)2] [Ag(CN)2].
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Q24
short answer
1 mark
Write IUPAC name of K3[Fe(C2O4)3].
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Q25
short answer
1 mark
Give a chemical test to show that [Co(NH3)5SO4]Cl and [Co(NH3)5Cl]SO4 are ionisation isomers.
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Q25
short answer
3 marks
For the first order thermal decomposition reaction, following data was obtained : C2H5Cl(g) — C2H4(g) + HCl(g). [S.No: 1, Time(s): 0, Total P(atm): 0.30] [S.No: 2, Time(s): 30, Total P(atm): 0.50]. Calculate rate constant. [Given : log 3 = 0.48]
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Q26
short answer
1 mark
What is meant by the ‘Chelate effect’ ? Give an example.
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Q27
short answer
1 mark
Differentiate between Fibrous protein and Globular protein.
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Q27
short answer
3 marks
Compound ‘X’ with molecular formula C4H9Br reacts with aqueous KOH to give an alcohol. The rate of this reaction depends only on the concentration of the compound ‘X’. When an optically active isomer ‘Y’ of the compound ‘X’ was treated with aqueous KOH solution, the rate of reaction was found to be dependent on concentration of compound ‘Y’ and aqueous KOH both. (a) Write down the structural formula of both ‘X’ and ‘Y’. (b) Out of ‘X’ and ‘Y’, which one will undergo racemisation and why ? (c) Out of ‘X’ and ‘Y’, which one will form product with inversion of configuration and why ?
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Q28
short answer
1 mark
Differentiate between Peptide linkage and Phosphodiester linkage.
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The reaction of amines with mineral acids to form ammonium salts shows that these are basic in nature. Aliphatic amines are stronger bases than ammonia whereas aromatic amines are weaker bases than ammonia. Aliphatic and aromatic primary and secondary amines react with acid chlorides, anhydrides and esters by nucleophilic substitution reaction. The main problem encountered during electrophilic substitution reactions of aromatic amines is that of their high reactivity. Substitution tends to occur at ortho-and para-positions. Hinsberg reagent is used for the identification and distinction between primary, secondary and tertiary amines. Aryldiazonium salts, usually obtained from arylamines, undergo replacement of the diazonium group with a variety of nucleophiles to provide advantageous methods for producing aryl halides, cyanides, phenols and arenes.
Q29
long answer
4 marks
The reaction of amines with mineral acids to form ammonium salts shows that these are basic in nature. Aliphatic amines are stronger bases than ammonia whereas aromatic amines are weaker bases than ammonia. Aliphatic and aromatic primary and secondary amines react with acid chlorides, anhydrides and esters by nucleophilic substitution reaction. The main problem encountered during electrophilic substitution reactions of aromatic amines is that of their high reactivity. Substitution tends to occur at ortho-and para-positions. Hinsberg reagent is used for the identification and distinction between primary, secondary and tertiary amines. Aryldiazonium salts, usually obtained from arylamines, undergo replacement of the diazonium group with a variety of nucleophiles to provide advantageous methods for producing aryl halides, cyanides, phenols and arenes.
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Q30
short answer
1 mark
Write the reaction involved in Reimer-Tiemann reaction.
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Q31
short answer
1 mark
Write the reaction involved in Kolbe’s reaction.
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Q32
short answer
1 mark
Write the reaction involved in Friedal-Crafts acylation of anisole.
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Q33
short answer
1 mark
Give reason: Carboxylic acids have higher boiling point than alcohols of comparable molecular masses.
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Q34
short answer
1 mark
Give reason: Alpha () hydrogens of aldehydes and ketones are acidic in nature.
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Q35
short answer
1 mark
Give reason: Nucleophilic addition of ammonia and its derivatives does not occur with carbonyl group in strongly acidic medium.
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Q37
short answer
1 mark
How do you explain the presence of all the six carbon atoms in a straight chain in the open structure of glucose?
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Q38
short answer
1 mark
How do you explain the presence of five –OH groups which are attached to different carbon atoms in the open structure of glucose?
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Q39
short answer
1 mark
How do you explain the presence of an aldehyde group in the open structure of glucose?
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Q41
short answer
3 marks
(i) Why is the Equilibrium Constant (Kc) related to Ecell and not to Ecell ? (ii) Two metals ‘A’ and ‘B’ have standard electrode potential values of –0.24 V and +0.80 V respectively. Which of these will liberate hydrogen gas from dil. H2SO4 ? (iii) Write the cell reaction which occurs in lead storage battery when it is in charging.
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Q42
short answer
3 marks
What type of battery is Mercury cell ? Why it is more advantageous than dry cell ? Write overall reaction taking place in Mercury cell.
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Q44
short answer
2 marks
(a) In octahedral crystal field, energies of which d-orbitals will be raised when ligands approach the central metal atom/ion ? Give reason in support of your answer.
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Q45
short answer
1 mark
(b) Using crystal field theory, write the electronic configuration of central metal atom/ion of the following : (i) [CoF6] 3– (ii) [Co(NH3)6] 3+ [At. No. : Co = 27]
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Q46
short answer
1 mark
(c) [NiCl4] 2– is paramagnetic while [Ni(CO)4] is diamagnetic though both are tetrahedral. Why ? [Atomic No. : Ni = 28]
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Q47
short answer
1 mark
(c) Write hybridization and magnetic behaviour of the complex [Fe(CN)6] 3–. [Atomic No. : Fe = 26]
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Q48
short answer
3 marks
(I) Why E M2+/M show irregular trend in the above values? (II) Why is E Cu2+/Cu value exceptionally positive? (III) Why E Mn2+ / Mn value is highly negative?
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Q49
short answer
2 marks
Write the ionic equations for the oxidising action of potassium permanganate for its reaction with I– in both acidic and alkaline solutions.
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Q50
short answer
1 mark
Name a member of the lanthanoid series (I) which exhibits +4 oxidation state (II) which exhibits +2 oxidation state.
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Q51
short answer
1 mark
Why transition metals act as good catalyst?
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Q52
short answer
1 mark
Why Cr has higher melting point than Mn?
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Q53
short answer
2 marks
What happens when acidic solution of potassium permanganate is allowed to stand for sometime? Give the equation involved. What is this type of reaction called?
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Q54
short answer
5 marks
Calculate emf and G for the following cell at 298 K : Mg(s) / Mg2+(0.01 M) // Ag+(0.001 M) / Ag(s). Given : E Mg2+ / Mg = –2.37 V, E Ag+ / Ag = +0.80 V [ 1 F = 96500 C mol–1, log 10 = 1]
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Q55
short answer
5 marks
For the reaction : 2AgCl(s) + H2(g) (0.4 atm) — 2Ag(s) + 2H+(0.1 M) + 2Cl– (0.2 M). Calculate emf of the cell at 25 C. Given : G = – 43500 J mol–1 [log 10 = 1, 1 F = 96500 C mol–1]
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Q56
short answer
3 marks
An organic compound (X) has the molecular formula C5H10O. Draw structures for (X) if it : (I) does not give Tollen’s test but gives a positive iodoform test. (II) does not give Tollen’s test and iodoform test but undergoes Aldol condensation. (III) undergoes Cannizzaro’s reaction.
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Q57
short answer
2 marks
Show how each of the following compounds can be converted to benzoic acid : (I) Acetophenone (II) Ethyl benzene
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Q58
short answer
1 mark
Draw structure of the 2, 4-dinitrophenyl hydrazone derivative of benzaldehyde.
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Q59
short answer
1 mark
Arrange the following in increasing order of their reactivity towards HCN : Di-tert. butyl ketone, Acetaldehyde, Acetone
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Q60
short answer
1 mark
Give a simple chemical test to distinguish between benzoic acid and ethyl benzoate.
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Q61
short answer
1 mark
Write the name of the reagent to convert Ethanenitrile to Ethanal.
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Q62
short answer
1 mark
Draw the structure of ‘X’ in the following reaction: (Arrow with CrO3)
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