Multiple Choice Questions. Question No. 1 to 11 (Multiple Choice Questions) will be provided after 30 minutes of starting examination. Rewrite its (MCQ) correct option (answer) in the same answer sheet.
[11×1=11]Which order of reaction does the following chemical equation represent?
RCOOR + H₂O H⁺ → RCOOH + ROH
A) Zero order B) Pseudo-first order C) Second order D) Third order
What is the normality of 5% Na₂CO₃ solution?
A) 0.94 N B) 0.98 N C) 0.99 N D) 1.01 N
Which of the following is the ionic product of water at 393 K?
A) Greater than 1×10⁻¹⁴ B) Less than 1×10⁻¹⁴ C) Equal to 1×10⁻¹⁴ D) Equal to 1×10⁻⁷
For what purpose is the hydrogen-oxygen fuel cell used in spacecraft?
A) Power for heat and light B) Power for pressure C) Power for propellation D) Power for uplift
Which of the following indicates lithophone?
A) ZnS + BaSO₄ B) ZnSO₄ + BaSO₄ C) ZnCO₃ + BaS D) ZnS + BaSO₃
Which of the following is the purest form of iron?
A) Cast iron B) Steel C) Haematite D) Wrought iron
Nitrobenzene can be prepared from benzene by using a mixture of conc. nitric acid and conc. H₂SO₄ in the nitrating mixture. What is the role of nitric acid?
A) A base B) An acid C) A catalyst D) A reducing agent
You are given (I) aniline (II) o-nitro aniline (III) P-nitro aniline and (IV) m-nitroaniline. What is the order of increasing basic nature?
A) II < I < III < IV B) I < II < III < IV C) II < III < I < IV D) II < III < IV < I
Which of the following mechanisms can occur in the hydrolysis of isopropyl chloride?
A) SN¹ Mechanism B) SN² Mechanism C) SN¹ and SN² Mechanism D) Neither SN¹ nor SN² Mechanism
What would be the product when benzaldehyde is heated with conc. NaOH?
A) Benzyl alcohol and sodium benzoate B) Sodium benzoate and benzaldehyde C) Sodium benzoate and benzene D) Benzyl alcohol and benzene
A compound 'X' undergoes reduction with LiAlH₄ to yield 'Y'. When 'Y' is passed over copper heated to 300°C, 'X' is formed. What is 'Y'?
A) Acetone B) Ethanal C) Ethanol D) Ethoxyethane
Attempt all the questions.
[8×5=40]a) Write any two differences between primary standard and secondary standard substance. [2]
b) 3.15 g of oxalic acid crystal (C₂H₂O₄.2H₂O) was dissolved in water to make 500 mL of its solution.
i) Determine the normality of the acid. [1]
ii) The acid solution became permanently pink when 400 mL of KMnO₄ solution (eq.wt.=31.5) was added during titration. What mass of the KMnO₄ is present in 1 liter of the solution? [2]
Why is standard hydrogen electrode called reference electrode? [1]
An electrochemical cell connects E°Zn²⁺/Zn electrode with standard hydrogen electrode and the emf of the cell is found to be +0.76 V.
i) Design cell notation indicating cathode and anode. [2]
ii) Write down net cell reaction. [1]
iii) What is the value of E°Zn²⁺/Zn? [1]
OR
a) State Hess's law of constant heat summation and illustrate it with an example. [2]
b) Heat of formation of CO₂ and H₂O are -94 kcal and -68 kcal, respectively. Calculate heat of reaction when 2 mole of CH₄ is formed. [3]
A) Identify A and B in the following reaction sequence.
A ──Cu₂Cl₂/H⁺──→ C₆H₅Cl ──Ni-Al/Δ──→ (Intermediate) ──Alkali──→ B
i) Write down correct chemical equation to identify (A) and (B). [2]
ii) What product would you obtain when (A) is:
a) boiled with water? [1]
b) treated with aniline? [1]
B) What happens when C₆H₅Cl is heated with chloral? [1]
A list of organic compounds is given as follows: Propanamine, ethoxyethane, ethyl cyanide, iodoethane and ethanol
Prepare a correct sequence of reaction chain from the above compounds using suitable reagents and conditions. [5]
OR
An organic compound (A) gives compound (B) when heated with silver powder. The compound (B) undergoes hydrolysis with water in presence of dil. H₂SO₄ and 1% HgSO₄ to yield (C). The compound (C) reacts with dilute alkali to form (D). The compound (C) can also be obtained by the reduction of ethanoyl chloride with hydrogen in presence of Pd/BaSO₄. Identify (A), (B), (C) and (D) with pertinent reactions. [5]
Give an example of each of the following reactions. [5]
a) Tollen's test
b) Cannizzaro's reaction
c) Decarbonylation
d) Reimer-Tiemann's reaction
e) Oxo-process.
Starting from CH₃MgBr, how would you prepare ethanoic acid? Write the action of ethanoic acid on: [1+4]
i) NH₃ ii) SOCl₂ iii) P₂O₅ iv) LiAlH₄
Write the preparation, properties and uses of mercuric chloride. [1+3+1]
A metal having electronic configuration [Ar] 3d¹⁰, 4s¹ belongs with IIB of the periodic table. The metal is widely used to make electric wires and domestic cooking utensils.
a) Draw a well-labelled blast furnace for smelting the metal from its ore. [2]
b) Write down chemical reactions that occur in the smelting process. [3]
Attempt all the questions.
[3×8=24]a) Write any two differences between order and molecularity of a reaction. [2]
b) Draw a graph showing the relationship between concentration of reactant and time for a zero order reaction. [1]
c) The experimental data for a hypothetical reaction X + Y → Z is:
| Expt. no | [X] molL⁻¹ | [Y] molL⁻¹ | initial rate, molL⁻¹s⁻¹ |
|---|---|---|---|
| I | 0.5 | 0.5 | 1.6×10⁻⁴ |
| II | 0.5 | 1.0 | 3.2×10⁻⁴ |
| III | 1.0 | 1.0 | 3.2×10⁻⁴ |
d) What is the order of reaction with respect to X? [1]
OR
a) i) What is meant by weak electrolyte? [1]
ii) Derive Ostwald's dilution equation. [2]
iii) Point out any two limitations of Ostwald's dilution law. [2]
b) Predict whether precipitation will occur or not on mixing 20 mL of 1×10⁻³ N of NaCl solution with 80 mL of 1×10⁻² N AgNO₃ solution if Ksp for AgCl = 1.5×10⁻¹⁰. [At.wt. of Ag = 108 amu.] [3]
a) Explain Hoffmann's method to separate ethanamine and N-methylmethanamine from their mixture. [4]
b) What happens when: [1+1+1+1]
i) chloroform is treated with acetone in presence of aq. KOH?
ii) ethanal reacts with 2,4-DNP?
iii) aniline is added to ice-cold solution of sodium nitrite and hydrochloric acid?
iv) Nitro-benzene is subjected to electrolytic reduction? OR a) Identify (A), (B), (C) and (D) in the following reaction sequence.![Reaction sequence: A with NaOH+CaO/heat gives B, then with CHCl₃/AlCl₃/heat gives C, then with CeO₂/H⁺/[O] gives D. Compound C can be obtained by Clemmensen's reduction of benzaldehyde.](q21-reaction.png)
Compound 'C' can be obtained by Clemmensen's reduction of benzaldehyde. [1×4]
b) Explain the test of propan-1-ol and propan-2-ol by using Victor-Meyer's method in detail. [4]
a) Explain the quality control system in the manufacture of portland cement. [2]
b) Give the correct structure of the following compounds. [2]
i) Aspirin ii) DDT
c) Write any two differences between paper and pulp. [2]
d) What is meant by artificial radioactivity? Write an example of it. [1+1]