Q1
mcq
1 mark
The role of a catalyst is to change :
- A. equilibrium constant
- B. enthalpy of reaction
- C. Gibbs energy of reaction
- D. activation energy of reaction
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Q2
mcq
1 mark
Which of the following molecules is chiral in nature ?
- A. 1-chloropropane
- B. 2-chloropropane
- C. 1-chlorobutane
- D. 2-chlorobutane
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Q3
mcq
1 mark
CH3CH2OH can be converted to CH3CHO by :
- A. catalytic hydrogenation
- B. treatment with LiAlH4
- C. treatment with PCC
- D. treatment with KMnO4
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Q4
mcq
1 mark
The IUPAC name for CH3 – CH2 – N(CH3) – CH2 – CH2 – CH3 is :
- A. N-methylpentan-2-amine
- B. N-ethyl-N-methylpropan-1-amine
- C. N,N-diethylpropan-1-amine
- D. N,N-dimethylpropan-1-amine
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Q5
mcq
1 mark
A plot between concentration of reactant [R] and time ‘t’ is shown below. Which of the given order of reaction is indicated by the graph ?
- A. Third order
- B. Second order
- C. First order
- D. Zero order
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Q6
mcq
1 mark
The treatment of ethyl bromide with alcoholic silver nitrite gives :
- A. ethyl nitrite
- B. nitroethane
- C. nitromethane
- D. ethene
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Q7
mcq
1 mark
Which of the following aqueous solutions will have the highest freezing point ?
- A. 1·0 M KCl
- B. 1·0 M Na2SO4
- C. 1·0 M Glucose
- D. 1·0 M AlCl3
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Q8
mcq
1 mark
Which of the following aldehydes will undergo Cannizzaro reaction ?
- A. CH3 – CH – CHO | CH3
- B. (CH3)3C CHO
- C. CH3 – CH2 – CHO
- D. CH3 – CH – CH – CHO | | CH3 CH3
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Q9
mcq
1 mark
In which of the following groups are both ions coloured in aqueous solution ? I. Cu+ II. Ti4+ III. Co2+ IV. Fe2+ [Atomic number : Cu = 29, Ti = 22, Co = 27, Fe = 26]
- A. I and II
- B. II and III
- C. III and IV
- D. I and IV
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Q10
mcq
1 mark
CH3CH2CHO and CH3CH2COOH can be distinguished by :
- A. Sodium bicarbonate test
- B. Hinsberg test
- C. Iodoform test
- D. Lucas test
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Q11
mcq
1 mark
Match the type of cell given in Column I with their use given in Column II. Column I Column II i. Lead storage cell a. Wall clock ii. Mercury cell b. Apollo Space Programme iii. Dry cell c. Wrist watch iv. Fuel cell d. Inverter
- A. i-a, ii-b, iii-c, iv-d
- B. i-d, ii-c, iii-a, iv-b
- C. i-c, ii-d, iii-b, iv-a
- D. i-b, ii-a, iii-d, iv-c
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Q11
mcq
Match the type of cell given in Column I with their use given in Column II. Column I: i. Lead storage cell, ii. Mercury cell, iii. Dry cell, iv. Fuel cell. Column II: a. Wall clock, b. Apollo Space Programme, c. Wrist watch, d. Inverter.
- A. i-a, ii-b, iii-c, iv-d
- B. i-d, ii-c, iii-a, iv-b
- C. i-c, ii-d, iii-b, iv-a
- D. i-b, ii-a, iii-d, iv-c
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Q12
mcq
While doing qualitative analysis in chemistry lab, Abhishek added yellow coloured potassium chromate solution into a test tube. He was surprised to see the colour of the solution changing immediately to orange. He realised that the test tube was not clean and contained a few drops of some liquid. Which of the following substances will be the most likely liquid to be present in the test tube before adding potassium chromate solution ?
- A. Sodium hydrogen carbonate solution
- B. Methyl orange solution
- C. Sodium hydroxide solution
- D. HCl solution
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Q13
short answer
Assertion (A) : For measuring resistance of an ionic solution an AC source is used. Reason (R) : Concentration of ionic solution will change if DC source is used.
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Q14
short answer
Assertion (A) : Henry’s law constant (KH) decreases with increase in temperature. Reason (R) : As the temperature increases, solubility of gases in liquids decreases.
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Q15
short answer
Assertion (A) : The solubility of aldehydes and ketones in water decreases with increase in size of the alkyl group. Reason (R) : Aldehydes and ketones have dipole-dipole interaction.
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Q16
short answer
Assertion (A) : The boiling points of alkyl halides decrease in the order RI > RBr > RCl > RF. Reason (R) : The van der Waals forces of attraction decrease in the order RI > RBr > RCl > RF.
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Q18
short answer
2 marks
(a) Calculate the elevation of boiling point of a solution when 3 g of CaCl2 (Molar mass = 111 g mol–1) was dissolved in 260 g of water, assuming that CaCl2 undergoes complete dissociation. (Kb for water = 0·52 K kg mol–1)
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Q18
short answer
2 marks
Based on the data given above, give plausible reason for the variation of conductivity and molar conductivity with concentration.
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Q19
short answer
2 marks
OR (b) Liquids ‘X’ and ‘Y’ form an ideal solution. The vapour pressure of pure ‘X’ and pure ‘Y’ are 120 mm Hg and 160 mm Hg respectively. Calculate the vapour pressure of the solution containing equal moles of ‘X’ and ‘Y’.
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Q20
short answer
2 marks
Explain the mechanism of acid catalysed hydration of ethene.
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Q21
short answer
1 mark
(a) Write the rate law expression for the reaction 2HI → H2 + I2, if the order of the reaction is zero.
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Q22
short answer
1 mark
(b) What is the effect of temperature on the rate of reaction? Write a mathematical expression for the same.
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Q23
short answer
3 marks
For the reaction A + B → Products, the following initial rates were obtained at various initial concentrations of reactants: Determine the order of the reaction with respect to A and B and overall order of the reaction.
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Q23
short answer
3 marks
For the reaction A + B → Products, the following initial rates were obtained at various initial concentrations of reactants: Sl. No. [A]/mol L–1 [B]/mol L–1 Initial rate/mol L–1 s–1. 1: 0·1, 0·1, 0·05. 2: 0·2, 0·1, 0·10. 3: 0·1, 0·2, 0·05. Determine the order of the reaction with respect to A and B and overall order of the reaction.
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Q24
short answer
1 mark
(a) How can acetaldehyde be prepared from acetyl chloride ?
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Q24
short answer
3 marks
(a) What is meant by crystal field splitting energy ? For a d4 ion, write the configuration if (i) o < P, and (ii) o > P. (b) Explain why in tetrahedral coordination entities, low spin configurations are rarely observed.
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Q25
short answer
1 mark
(b) Propanal is more reactive than propanone towards nucleophilic addition reaction. Give reason.
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Q25
short answer
3 marks
Account for the following : (a) The C – Cl bond length in chlorobenzene is shorter than that in methyl chloride. (b) Grignard reagents should be prepared under anhydrous conditions. (c) In case of optically active alkyl halides, SN1 reactions are accompanied by racemisation.
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Shweta mixed two liquids A and B of 10 mL each. After mixing, the volume of the solution was found to be 20·2 mL.
Q26
short answer
1 mark
(i) Why was there a volume change after mixing the liquids ?
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Q26
short answer
3 marks
(a) Arrange the following compounds in the increasing order of their acidic strength : 3,5-dinitrophenol, 4-methylphenol, phenol, 2,4,6-trinitrophenol (b) What happens when : (write equations) (i) Phenol is distilled with Zn dust ? (ii) Anisole is treated with HBr ?
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Q27
short answer
1 mark
(ii) Will there be an increase or decrease of temperature after mixing ?
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Q27
short answer
3 marks
An organic compound ‘A’ (molecular formula C8H8O) gives 2,4-DNP test. It does not give Tollen’s test, but gives a yellow precipitate ‘B’ with NaOH and I2. On drastic oxidation, it gives a carboxylic acid ‘C’ with formula C7H6O2. Identify ‘A’, ‘B’, ‘C’ and write the reactions involved.
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Q28
short answer
1 mark
(iii) Give one example for this type of solution.
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Q28
short answer
3 marks
(a) Name the type of linkage responsible for the formation of proteins from -amino acids. (b) Write any two differences between DNA and RNA.
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Q29
short answer
1 mark
(i) How does sprinkling of salt help in clearing the snow covered roads in hilly areas ?
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Q30
short answer
1 mark
(ii) What happens when red blood cells are kept in 0·5% (mass/vol) NaCl solution ? Justify your answer.
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Q31
short answer
1 mark
(iii) Write an application of reverse osmosis.
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Carbohydrates are polyhydroxy aldehydes or ketones that represent enormous structural diversity in terms of the arrangement of atoms in space, resulting in hundreds of stereoisomers. Although the chemical properties of most stereoisomers may not be very different, their metabolic rate and utilization in biological systems is significantly different and known to influence the overall carbohydrate metabolism. Structural variants, which arise due to a different arrangement of atoms in three-dimensional space are known as stereoisomers. The number of stereoisomers can be theoretically estimated by using the formula 2n, where ‘n’ is the number of stereocenters or asymmetric (chiral) carbon atoms in a molecule. Out of these stereoisomers, there are some structures, which are mirror images of each other, and they are referred to as enantiomers.
Q39
short answer
2 marks
(a) Give chemical reactions to show the presence of an aldehydic group and straight chain in glucose.
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Q41
short answer
1 mark
(b) (ii) Draw the structure of -D-Glucopyranose.
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Q42
short answer
1 mark
(c) Sucrose is known as invert sugar. Explain.
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Q43
short answer
2 marks
One mole of CrCl3. 4H2O precipitates one mole of AgCl when treated with excess of AgNO3 solution. Write (i) the structural formula of the complex, and (ii) the secondary valency of Cr.
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Q44
short answer
1 mark
What is the difference between a complex and a double salt ?
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Q45
short answer
1 mark
Arrange the following complexes in the increasing order of conductivity of their solution : [Cr(NH3)3Cl3], [Cr(NH3)6]Cl3, [Cr(NH3)5Cl]Cl2
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Q46
short answer
1 mark
Write two differences between primary and secondary valences in coordination compounds.
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Q47
short answer
2 marks
For a galvanic cell, the following half reactions are given. Decide, which will remain as reduction reaction and which will be reversed to become an oxidation reaction. Give reason for your answer. (I) Cr3+ + 3e– → Cr(s); E = – 0·74 V (II) Fe2+ + 2e– → Fe(s); E = – 0·44 V
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Q48
short answer
3 marks
Represent the cell in which the following reaction takes place : Mg(s) + 2Ag+ (0·001 M) → Mg2+ (0·100 M) + 2Ag(s). Calculate Ecell if Ecell = 3·17 V. (log 10 = 1)
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Q49
short answer
2 marks
State Kohlrausch’s law. Give any two applications of it.
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Q50
short answer
3 marks
λm NH4Cl, λm NaOH and λm NaCl are 129·8, 217·4, and 108·9 S cm2 mol–1 respectively. Molar conductivity of 1 10–2 M solution of NH4OH is 9·33 S cm2 mol–1. Calculate the degree of dissociation (α) of NH4OH solution at this concentration.
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Q51
short answer
1 mark
In a chemistry practical class, the teacher gave his students an amine ‘X’ having molecular formula C2H7N, and asked the students to identify the type of amine. One of the students, Neeta, observed that it reacts with C6H5SO2Cl, to give a compound which dissolves in NaOH solution. Can you help Neeta to identify the compound ‘X’ ?
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Q52
short answer
1 mark
Arrange the following in the increasing order of their pKb value in aqueous phase : C6H5NH2, (CH3)2NH, NH3, CH3NH2, (CH3)3N
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Q53
short answer
1 mark
Aniline on nitration gives considerable amount of meta product along with ortho and para products. Why ?
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Q54
short answer
2 marks
Convert aniline to : (I) p-bromoaniline (II) phenol
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Q55
short answer
1 mark
Arun heated a mixture of ethylamine and CHCl3 with ethanolic KOH, which forms a foul smelling gas. Write the chemical equation involved.
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Q56
short answer
2 marks
Identify A and B in the following reactions :
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Q57
short answer
2 marks
Convert aniline to : (I) benzene (II) sulphanilic acid
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Q58
short answer
2 marks
When pyrolusite ore is fused with KOH, in presence of air, a dark green coloured product ‘A’ is obtained which changes to purple coloured compound ‘B’ in acidic medium. (I) Write the formulae of ‘A’ and ‘B’. (II) Write the ionic equation for the reaction when compound ‘B’ reacts with Fe2+ in acidic medium.
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Q59
short answer
3 marks
Give reasons : (I) Ce4+ in aqueous solution is a good oxidising agent. (II) The actinoid contraction is greater from element to element than lanthanoid contraction. (III) E°Zn2+/Zn value is more negative than expected, whereas E°Cu2+/Cu is positive.
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Q60
short answer
2 marks
While studying the periodic properties, Arti came across an abnormal behaviour in the atomic size of Hf. She found that, even though Hf is placed below Zr in the same group, both have almost similar atomic sizes. (I) Which phenomenon is responsible for the above behaviour ? Define it. (II) Mention any other consequence of the above phenomenon.
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Q61
short answer
3 marks
Give reasons for the following : (I) Transition metals exhibit catalytic properties. (II) Transition metals have high enthalpy of atomisation. (III) Sc is a transition element, while Zn is not.
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