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Q1
short answer
2 marks
Acetaldehyde, Benzaldehyde, Acetophenone, Acetone (Reactivity towards HCN)
Q2
short answer
2 marks
(CH3)2CHCOOH, CH3CH2CH(Br)COOH, CH3CH(Br)CH2COOH (Acidic strength)
Q2
short answer
2 marks
In a plot of m against the square root of concentration (C1/2) for strong and weak electrolyte, the value of limiting molar conductivity of a weak electrolyte cannot be obtained graphically. Suggest a way to obtain this value. Also state the related law, if any.
Q3
short answer
2 marks
CH3CH2OH, CH3CHO, CH3COOH (Boiling point)
Q3
short answer
2 marks
Write reasons for the following statements : (i) Benzoic acid does not undergo Friedel-Crafts reaction. (ii) Oxidation of aldehydes is easier than that of ketones.
Q6
short answer
3 marks
Ethylamine is soluble in water whereas aniline is insoluble.
Q7
short answer
3 marks
Amino group is o- and p-directing in aromatic electrophilic substitution reactions, but aniline on nitration gives a substantial amount of m-nitroaniline.
Q8
short answer
3 marks
Amines behave as nucleophiles.
Reading Passage
Observe the given figure and answer the following questions
Q8
short answer
3 marks
Observe the given figure and answer the following questions : (i) Write the expression for adsorption of gases on solids in the form of an equation. (ii) What is the slope of the graph ? (iii) What does the intercept of the line represent ?
Q9
short answer
3 marks
Write reasons for the following : Ethylamine is soluble in water whereas aniline is insoluble.
Q10
short answer
3 marks
Write reasons for the following : Amines behave as nucleophiles.
Q10
short answer
3 marks
Write the Nernst equation and calculate emf of the following cell at 298 K : Cr|Cr3+ (0·1 M)||Fe2+ (0·01 M)|Fe. Given : E(Cr3+/Cr) = 0·75 V, E(Fe2+/Fe) = 0·45 V (log 10 = 1)
Q11
short answer
3 marks
Write the electronic configuration of d5 on the basis of crystal field splitting theory if o < P.
Q12
short answer
3 marks
[Fe(CN)6]3 is weakly paramagnetic whereas [Fe(CN)6]4 is diamagnetic. Give reason to support this statement. [Atomic no. : Fe = 26]
Q13
short answer
3 marks
Write the number of ions produced from the complex [Co(NH3)6]Cl2 in solution.
Q14
short answer
3 marks
Calculate the spin only magnetic moment of the complex [CoF6]3 . (Atomic no. of Co = 27)
Q15
short answer
3 marks
Write the IUPAC name of the given complex : [CrCl2(H2O)4]Cl
Q16
short answer
3 marks
Which out of the two complexes is more stable and why ? [Fe(H2O)6]3+, [Fe(C2O4)3]3
Q17
short answer
3 marks
Which ion amongst the following is colourless and why ? Ti4+, Cr3+, V3+ (Atomic number of Ti = 22, Cr = 24, V = 23)
Q18
short answer
3 marks
Why is Mn2+ much more resistant than Fe2+ towards oxidation ?
Q19
short answer
3 marks
Highest oxidation state of a metal is shown in its oxide or fluoride only. Justify the statement.
Q21
short answer
3 marks
Write equations involved in the following reactions : Ethanamine reacts with acetyl chloride.
Q22
short answer
3 marks
Write equations involved in the following reactions : Aniline reacts with bromine water at room temperature.
Q23
short answer
3 marks
Write equations involved in the following reactions : Aniline reacts with chloroform and ethanolic potassium hydroxide.
Q24
short answer
1 mark
Write the IUPAC name for the following organic compound : (CH3CH2)2NCH3
Q25
short answer
2 marks
Write the equations for the following : (I) Gabriel phthalimide synthesis (II) Hoffmann bromamide degradation
Q27
short answer
3 marks
Silver atom has completely filled d-orbitals in its ground state, it is still considered to be a transition element. Justify the statement.
Q28
short answer
3 marks
Why are E(M2+/M) values of Mn and Zn more negative than expected ?
Q29
short answer
3 marks
Why do transition metals form alloys ?
Q30
short answer
(i) Which element in 3d series has lowest enthalpy of atomisation ?
Q31
short answer
(ii) Why do metals of the second and third series have greater enthalpies of atomisation ?
Q32
short answer
3 marks
(iii) Why are enthalpies of atomisation of transition metals quite high ?
Reading Passage
The rate law for a chemical reaction relates the reaction rate with the concentrations or partial pressures of the reactants. For a general reaction aA + bB C with no intermediate steps in its reaction mechanism, meaning that it is an elementary reaction, the rate law is given by r = k[A]x [B]y, where [A] and [B] express the concentrations of A and B in moles per litre. Exponents x and y vary for each reaction and are determined experimentally. The value of k varies with conditions that affect reaction rate, such as temperature, pressure, surface area, etc. The sum of these exponents is known as overall reaction order. A zero order reaction has a constant rate that is independent of the concentration of the reactants. A first order reaction depends on the concentration of only one reactant. A reaction is said to be second order when the overall order is two. Once we have determined the order of the reaction, we can go back and plug in one set of our initial values and solve for k.
Q33
short answer
1 mark
(i) Calculate the overall order of a reaction which has the following rate expression : Rate = k[A]1/2 [B]3/2
Q34
short answer
1 mark
(ii) What is the effect of temperature on rate of reaction ?
Q35
short answer
1 mark
(iii) What is meant by rate of a reaction ?
Q36
short answer
2 marks
(iv) (a) A first order reaction takes 77·78 minutes for 50% completion. Calculate the time required for 30% completion of this reaction. (log 10 = 1, log 7 = 0·8450)
