Multiple choice questions. Question No. 1 to 11 (Multiple Choice Questions) will be provided after 30 minutes of starting examination. Rewrite its (MCQ) correct options (answer) in the same answer sheet.
[11×1=11]Which of the following concentration terms is independent of temperature?
A) Mole fraction B) Normality C) Molarity D) gL⁻¹
Which of the following salts undergoes hydrolysis to form an alkali?
A) CuSO₄ B) Na₂CO₃ C) NH₄Cl D) FeCl₃
The halflife of a reaction gets halved as the initial concentration of the reaction is doubled. What is the order of reaction?
A) 0 B) 1st C) 2nd D) 3rd
Which of the following expressions best explains the second law of thermodynamics?
A) ΔSuniverse < 0 B) ΔSuniverse > 0
C) ΔSuniverse = 0 D) ΔSuniverse ≤ 0
Which of the following complex ions gives square planar geometry?
A) [Ni(CN)₄]²⁻ B) [NiCl₄]²⁻
C) [Zn(NH₃)₄]²⁺ D) [Zn(NH₃)₆]²⁺
Coating a thin layer of zinc on the surface of iron is done so as to protect it from rusting. What is this process called?
A) Electroplating B) Galvanization
C) Metallizing D) Tempering
The reduction of Cl
|C=O group into –CHO is carried out by which of the following reagents?
A) H₂/Ni B) LiAlH₄
C) H₂, Pd/BaSO₄ D) H₂/Pd
(A) —aq. NaOH→ (B) —K₂Cr₂O₇/ H⁺→ (C)
[O]
The compound (C) undergoes Clemmenson's reduction to give propane. What is the compound (A)?
A) propan-1-ol B) propan-2-ol
C) 2-halopropane D) propanoic acid
What does the action of nitrous acid on ethylamine produce?
A) Ethane B) Ethyl nitrite C) Nitroethane D) Ethyl alcohol
Which of the following reactions is used to distinguish between phenol and alcohol?
A) Lucas test B) Ferric chloride test
C) Tollen's test D) Victor-Mayer's test
What product will be obtained when CH₃CH₂MgBr is treated with H₂O?
A) ethane B) ethene
C) ethanol D) ethanal
Short answer questions
[8×5=40]An electrochemical cell (galvanic cell) is designed by coupling copper electrode with standard hydrogen electrode (SHE).
E⁰Cu²⁺/Cu = 0.34V
i) Draw the galvanic cell.
ii) Write down the complete cell reaction.
iii) What is the function of SHE in the cell? 2+2+1
Or
Define heat of combustion. Heat of combustion of carbon (s), sulphur (s) carbon disulphide (l) are -395KJ, -295KJ and -1110KJ, respectively. Calculate the heat of formation of carbon disulphide, CS₂(s). 1+4
a) Define solubility and solubility product principle. 2
b) If the pH of saturated solution of Ba(OH)₂ is 12, calculate the value of Ksp. 3
a) A metal (M) belongs to the first transition series and group VIII of periodic table. Draw a blast furnace for the smelting process during the extraction of (M) from its chief ore. 2
b) Explain the chemical reaction occuring in different parts of the furnace. 3
Write the chemistry of blue vitriol. 5
a) What happens when aniline is:
i) warmed with benzaldehyde?
ii) treated with benzene diazonium chloride? 2
b) Give the chemical reaction for the preparation of nitrobenzene at laboratory. 1
c) Starting from nitrobenzene, how would you obtain phenylisocyanide? 2
Make a correct sequence of reactions using suitable conditions and reagents of the following compounds.
Sodium benzoate, Toluene, Benzene, Benzaldelyde, Benzoin. 5
Or
Identify (A), (B), (C), (D) and (E) in the following sequence of reactions:
(A) —HBr→ (B) —alc. KOH→ (C) —O₃→ (D) + (E)
Zn/H₂O
The compound (A) undergoes oxidation to give propanone and the compound (D) is an aldehyde which gives iodoform test.
Show your familiarity with chemical reactions for each of the following: 1+1+1+1+1
i) Reimer-Tiemann reaction
ii) Gattermann's reaction
iii) Oxo-process
iv) Cannizzaro's reaction
v) Tollen's test
If you are given the mixture of methanamine, N-methyl methanamine and N, N-dimethyl methanamine, how will you separate them using Hofmann's method? 5
Long answer questions
[3×8=24]a) Derive the relationship between normality and molarity. 2
b) Differentiate between equivalence point and end point. 2
c) If 20 mL of N/2 HCl, 60 mL of N/10 HNO₃ and 150 mL of N/5 H₂SO₄ are mixed together, what will be the normality of the resulting acid mixture? 4
Or
Differentiate between rate of reaction and rate constant. Show that half life for a reaction is independent upon the initial concentration of reactant. The following data were obtained at 300 K for the reaction: 2+2
2A + 2B → C + D
| Experiment | [A] molL⁻¹ | [B] molL⁻¹ | Initial rate of formation of [C] molL⁻¹s⁻¹ |
|---|---|---|---|
| I | 0.1 | 0.1 | 6.0×10⁻³ |
| II | 0.3 | 0.2 | 7.2×10⁻² |
| III | 0.3 | 0.4 | 2.88×10⁻¹ |
| IV | 0.4 | 0.1 | 2.4×10⁻² |
i) the order of reaction with respect to each reactant. 2
ii) the rate law. 2
An organic compound (A) reacts with acetone to produce a kind of sleep inducing drug.
i) How would you prepare compound (A) by using one isomer of C₂H₆O. 2
ii) Why is compound (A) stored in an air-tight bottle by adding small amount of ethanol? 2
iii) What happens when compound (A) is: 4
a) heated with Conc.HNO₃?
b) reduced in acidic medium?
c) boiled with aq. alkali?
d) heated with Ag powder?
Or
a) Identify the compounds A, B, C, D and E with suitable reactions or reasons.
A —PCl₅→ B —NH₃→ C —Br₂/NaOH→ D —NaNO₂/HCl <5°C→ E
Compound E is a primary alcohol, which gives iodoform test.
b) How does ethanoic acid react with
(i) P₂O₅ (ii) ethanol (iii) sodium bicarbonate. 5+3
Applied chemistry deals with the chemistry involved in the materials of daily use.
a) Write down two examples each of antipyretic and tranquilizer drugs.
b) Write down two major differences between ordinary Portland cement (OPC) and Portland pozzolana cement (PPC).
c) Why is beaching of pulp necessary during paper production? How is it done?
d) Explain the harms caused by nuclear radiations or radioactivity on human health. 2+2+2+2