Q1
mcq
1 mark
An α-helix is a structural feature of :
- A. Sucrose
- B. Starch
- C. Polypeptides
- D. Nucleotides
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Q2
mcq
1 mark
The glycosidic linkage involved in linking the glucose units in amylase part of starch is :
- A. C1 - C6 linkage
- B. C1 - C6 linkage
- C. C1 - C4 linkage
- D. C1 - C4 linkage
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Q3
mcq
1 mark
Ag+(aq) + e- → Ag(s) E° = + 0.80 V, Fe2+(aq) + 2e- → Fe(s) E° = - 0.44 V. Find the E°cell for : Fe(s) + 2Ag+(aq) → Fe2+(aq) + 2Ag(s)
- A. 1.6 V
- B. 1.16 V
- C. 2.04 V
- D. 1.24 V
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Q4
mcq
1 mark
A first order reaction takes 30 minutes for 50% completion. The value of rate constant k would be :
- A. 2.5 × 10^-3 min^-1
- B. 2.75 × 10^-4 min^-1
- C. 1.25 × 10^-3 min^-1
- D. 2.31 × 10^-3 min^-1
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Q5
mcq
1 mark
Which of the following is least basic ?
- A. (CH3)2NH
- B. NH3
- C. C6H5NH2
- D. (CH3)3N
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Q6
mcq
1 mark
CH3CONH2 on reaction with NaOH and Br2 in alcoholic medium gives :
- A. CH3COONa
- B. CH3NH2
- C. CH3CH2Br
- D. CH3CH2NH2
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Q7
mcq
1 mark
In the reaction R-OH + HCl --(ZnCl2)--> R-Cl + H2O, what is the correct order of reactivity of alcohol ?
- A. 1 < 2 < 3
- B. 1 > 3 > 2
- C. 1 > 2 > 3
- D. 3 > 1 > 2
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Q8
mcq
1 mark
The colligative property used for the determination of molar mass of polymers and proteins is :
- A. Osmotic pressure
- B. Depression in freezing point
- C. Relative lowering of vapour pressure
- D. Elevation in boiling point
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Q9
mcq
Low concentration of oxygen in the blood and tissues of people living at high altitude is due to :
- A. high atmospheric pressure
- B. low temperature
- C. low atmospheric pressure
- D. both low temperature and high atmospheric pressure
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Q10
mcq
Which of the following is affected by catalyst ?
- A. H
- B. G
- C. Ea
- D. S
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Q11
mcq
The compounds [Co(SO4) (NH3)5] Br and [Co(Br) (NH3)5] SO4 represent :
- A. optical isomerism
- B. linkage isomerism
- C. ionisation isomerism
- D. coordination isomerism
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Q12
mcq
The synthesis of alkyl fluoride is best obtained from :
- A. Free radicals
- B. Swartz reaction
- C. Sandmeyer reaction
- D. Finkelstein reaction
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Q13
mcq
The most common and stable oxidation state of a Lanthanoid is :
- A. + 2
- B. + 3
- C. + 4
- D. + 6
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Q14
mcq
The order of the reaction H2 (g) + Cl2 (g) -> 2HCl (g) is :
- A. 2
- B. 1
- D. 3
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Q15
mcq
Assertion (A) : (C2H5)2NH is more basic than (C2H5)3N in aqueous solution. Reason (R) : In (C2H5)2NH, there is more steric hindrance and +I effect than (C2H5)3N.
- 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
short answer
Assertion (A) : The molecularity of the reaction H2 + Br2 2HBr appears to be 2. Reason (R) : Two molecules of the reactants are involved in the given elementary reaction.
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Q17
short answer
Assertion (A) : Acetylation of aniline gives a monosubstituted product. Reason (R) : Activating effect of NHCOCH3 group is more than that of amino group.
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Q18
short answer
Assertion (A) : EDTA is used to determine hardness of water. Reason (R) : EDTA is a bidentate ligand.
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Q19
short answer
2 marks
A solution is prepared by dissolving 10 g of non-volatile solute in 200 g of water. It has a vapour pressure of 31.84 mm Hg at 308 K. Calculate the molar mass of the solute. (Vapour pressure of pure water at 308 K = 32 mm Hg)
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Q20
short answer
2 marks
Explain briefly : (a) Carbylamine reaction (b) Gabriel phthalimide synthesis
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Q21
short answer
2 marks
How would you account for : (a) The E value for the Mn3+/Mn2+ couple is much more positive than that for Cr3+/Cr2+ couple or Fe3+/Fe2+ couple. (b) Complete the following equation : MnO4 2 + 16H+ + 2 2O4 5C
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Q22
short answer
2 marks
(a) On diluting two electrolytes A and B, K is 25 times while for B it is 1.5. Which of the two electrolytes is strong ? Justify your answer graphically. OR (b) The electrical resistance of a column of 0.05 mol L-1 NaOH solution of diameter 1 cm and length 50 cm is 5.55 x 10^3 ohm. Calculate the conductivity.
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Q23
short answer
2 marks
(a) Predict the products of the following reactions : (i) CH3CH2OH Cu 273K (ii) C6H5OH aq Br2 OR (b) Give reasons for the following : (i) p-nitrophenol is more acidic than p-methylphenol. (ii) (CH3)3C Br on reaction with NaOCH3 gives alkene as the main product and not an ether.
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Q24
short answer
2 marks
(a) CH3 CH CH3 OH PCl5 AgCN (b) CH3CH2CH2Cl + KOH ethanol HBr Identify A and B in the above reactions.
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Q25
short answer
2 marks
Define denaturation of protein. What is the effect of denaturation on the structure of protein ?
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Q26
short answer
3 marks
Give reason : (a) Measurement of osmotic pressure method is preferred for the determination of molar masses of macromolecules such as proteins and polymers. (b) Aquatic animals are more comfortable in cold water than in warm water. (c) Elevation of boiling point of 1 M KCl solution is nearly double than that of 1 M sugar solution.
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Q27
short answer
3 marks
Complete the following reactions :
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Q28
short answer
3 marks
How do you convert the following : (Any three) (a) Phenol to 2-Hydroxybenzaldehyde (b) Anisole to 2-Methoxyacetophenone (c) Propene to Propan-2-ol (d) Ethanol to Ethanal
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Q29
short answer
What are the hydrolysis products of (i) Lactose, (ii) Maltose ?
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Q30
short answer
3 marks
Give the basic structural difference between starch and cellulose.
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Q31
short answer
3 marks
Explain why : (i) Carboxyl group in benzoic acid is meta directing. (ii) Sodium bisulphite is used for the purification of aldehydes and ketones. (iii) Carboxylic acids do not give characteristic reactions of carbonyl group.
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Q32
short answer
3 marks
3H8O on I2/NaOH. Deduce the structures of A, B and C.
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In coordination compounds, metals show two types of linkages, primary and secondary. Primary valencies are ionisable and are satisfied by negatively charged ions. Secondary valencies are non-ionisable and are satisfied by neutral or negative ions having lone pair of electrons. Primary valencies are non-directional while secondary valencies decide the shape of the complexes.
Q33
short answer
1 mark
If PtCl2. 2NH3 does not react with AgNO3, what will be its formula ?
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Q34
short answer
1 mark
What is the secondary valency of [Co(en)3]3+ ?
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Q35
short answer
2 marks
(1) Write the formula of Iron(III)hexacyanidoferrate(II). (2) Write the IUPAC name of [Co(NH3)5Cl] Cl2.
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Q36
short answer
2 marks
Write the hybridization and magnetic behaviour of [Ni(CN)4]2. [Atomic number : Ni = 28]
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Q37
short answer
1 mark
g§H«$_U VÎdm| H$s 3d loUr _| go _¢JZrµO +7 àX{e©V H$aVm h¡ — Give reason
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Q38
short answer
1 mark
Transition metals and their compounds generally act as good catalysts in chemical reactions — Give reason
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Q39
short answer
1 mark
Cr2+ is reducing in nature while Mn3+ with the same d-orbital configuration (d4) is an oxidising agent — Give reason
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Q40
short answer
1 mark
Atomization enthalpy of Zn is minimum — Give reason
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Q41
short answer
1 mark
In aqueous solution, Cu+ ... — Give reason
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The rate of reaction is concerned with decrease in concentration of reactants or increase in the concentration of products per unit time. It can be expressed as instantaneous rate at a particular instant of time and average rate over a large interval of time. Mathematical representation of rate of reaction is given by rate law. Rate constant and order of a reaction can be determined from rate law or its integrated rate equation.
Q42
short answer
1 mark
(i) What is average rate of reaction ?
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Q43
short answer
1 mark
(ii) Write two factors that affect the rate of reaction.
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Q44
short answer
2 marks
(iii) (1) What happens to rate of reaction for zero order reaction ? (2) What is the unit of k for zero order reaction ?
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Q45
short answer
1 mark
(i) Manganese exhibits the highest oxidation state of +7 among the 3d series of transition elements.
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Q46
short answer
1 mark
(ii) Transition metals and their compounds are generally found to be good catalysts in chemical reactions.
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Q47
short answer
1 mark
(iv) Zn has lowest enthalpy of atomization.
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Q48
short answer
1 mark
(v) Cu+ is unstable in an aqueous solution.
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Q49
short answer
2 marks
(i) Carry out the following conversions : (1) Ethanal to But-2-en-1-al (2) Propanoic acid to 2-chloropropanoic acid
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Q50
long answer
3 marks
(ii) An alkene with molecular formula C5H10 on ozonolysis gives a mixture of two compound positive Fehling test and also reacts with iodine and NaOH
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Q51
short answer
2 marks
(i) Distinguish with a suitable chemical test : (1) CH3COCH2CH3 and CH3CH2CH2CHO (2) Ethanal and Ethanoic acid
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Q52
short answer
1 mark
(ii) Write the structure of oxime of acetone.
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Q54
short answer
2 marks
(i) Write an expression for the molar conductivity of acetic acid at infinite dilution.
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Q55
long answer
3 marks
(ii) Calculate the maximum work and log Kc for the given reaction at 298 K : Ni (s) + 2Ag+ (aq) Ni2+ (aq) + 2Ag (s) Given : E0 Ni2+/Ni = -0.25 V, E0 Ag+/Ag = + 0.80 V, 1 F = 96500 C mol-1
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Q56
short answer
2 marks
(i) How much charge in terms of Faraday, is required for the reduction of 1 mol Cu2+ to Cu ?
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Q57
long answer
3 marks
(ii) Calculate emf of the following cell at 298 K for Mg (s) Mg2+ (0.1 M) || Cu2+ (0.1 M) | Cu (s) [E0cell = + 2.71 V, 1 F = 96500 C mol-1, log 10 = 1]
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