Multiple Choice Questions. Attempt all the 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.
To estimate the chloride ion present in tap water, volumetric analysis has been commonly used in laboratory. Which of the following solutions can be used for the above mentioned titration?
A) BaCl₂ B) NaOH C) K₂Cr₂O₇ D) AgNO₃
The half-life of a certain reaction is 50 seconds and remains constant even if the initial concentration of the reactant is doubled. What is the order of the reaction?
A) Zero order reaction B) First order reaction
C) Second order reaction D) Pseudo-first order reaction
Gibbs-Helmholtz equation is represented as : ΔG = ΔH-TΔS.
For what value of ΔG will the reaction be spontaneous?
A) Positive B) Zero C) Negative D) Infinite
Standard reduction potential values for P, Q, R and S are +0.34V, -0.76V, +0.0V and -3.05V, respectively. What is the correct order of their reducing power?
A) P > R > Q > S B) S > R > Q > P
C) Q > P > S > R D) S > Q > R > P
A deep blue complex is formed when conc. ammonium hydroxide is added to an aqueous solution of CuSO₄. Which of the following formulae represents the complex?
A) [Cu(NH₃)₄]²⁺ B) [Cu(NH₃)₄]⁺
C) [Cu(NH₃)₂]²⁺ D) [Cu(NH₃)₆]²⁺
Which of the following is the maximum possible oxidation state of the transition metals in 3d series?
A) +3 B) +6 C) +7 D) +8
Which of the following are organometallic compounds?
i) CH₃MgI ii) Ni(CO)₄ iii) C₄H₉Li
iv) C₂H₅ONa v) (C₂H₅)₂SnCl₂
A) i) and ii) only B) i), ii) and iii) only
C) i), ii), iii) and iv) only D) i), ii), iii) and v) only
The organic compound (X) boils with water gives phenol. What is the compound (X)?
A) Chlorobenzene B) Benzenediazonium chloride
C) Benzenesulphonic D) Aniline
Which of the following compounds gives positive carbylamine reaction?
A) (CH₃)₂NH B) (CH₃)₃N
C) (CH₃)₄N⁺ D) CH₃NH₂
A compound 'Z' with molecular formula C₄H₈O₂ is heated to produce compound 'Y' and CO₂ gas. Heating of compound 'Y' with P₂O₅ forms compound 'X' and water molecule. Identify the compound 'X'.
A) Ethanoic acid B) Ethanoic anhydride
C) Methanoic anhydride D) Ethanal
A sequence of reactions is represented as :
Benzene →(CH₃Cl / Anhy.AlCl₃) (A) →(CeO₂, |H⁺ / [O]) (B) →(alc.KCN / Reflux) (C)
Predict the name of reaction that converts (B) to (C).
A) Benzoin condensation B) Perkin's condensation
C) Aldol condensation D) Claisen condensation
Attempt all the questions.
[8×5=40]Define instantaneous rate of reaction. Write down the rate expressions of the following reaction.
2N₂O₅(g) → 4NO₂(g) + O₂(g)
If 2.24 litres of O₂ at NTP is produced in 30 minutes, what is the rate of disappearance of N₂O₅(g)? [5]
Define standard heat of formation. Calculate the heat of formation of acetic acid from the following data: [5]
C(s) + O₂(g) → CO₂(g) ; ΔH = -99 kcal/mol
H₂(g) + ½ O₂(g) → H₂O(l) ; ΔH = -68 kcal/mol
CH₃COOH + 2O₂(g) → 2CO₂(g) + 2H₂O(l) ; ΔH = -208 kcal/mol
OR
You are given the standard reduction potentials,
E⁰Zn²⁺/Zn = -0.76V, E⁰Mg²⁺/Mg = -2.38V
Answer the following questions:
a) What is standard electrode potential? [1]
b) Construct the galvanic cell notation for the given electrodes indicating anode and cathode. [2]
c) Write the complete cell reaction for the given cell. [1]
d) Calculate the cell potential for the given cell at 25°C. [1]
A chemical reaction occurs as follows:
CH₃CH₂CH₂Br + aq. KOH → B + KBr
(A)
a) Identify the compound 'B' in the above reaction. [1]
b) Which substitution reaction mechanism occurs in the above reaction and why? [2]
c) What is the product formed when alc. KOH solution is used instead of aq. KOH in the above reaction? [1]
d) How can you obtain nitropropane from compound 'A'? [1]
A list of compounds is given as follows:
| P-aminoazobenze, Benzenediazonium chloride, Aniline, Nitrobenzene, Phenol and Benzene |
From the above list of compounds, prepare a sequence of reaction chain with suitable conditions and reagents. [5]
OR
An aliphatic compound (A) reacts with SOCl₂ to give (B). The compound (B) is heated with ammonia to produce (C). The compound (C) is further heated with Br₂/KOH to yield (D). The compound (D) gives (E) when treated with NaNO₂/HCl at low temperature. The compound (E) is a primary alcohol which gives positive iodoform test. Identify compound (A) to (E) with the reactions involved. [5]
Write the chemical equations to illustrate the following reactions: [5×1=5]
a) 2,4-DNP test
b) Reimer-Tiemann reaction
c) Williamson's reaction
d) Perkin's condensation reaction
e) Wurtz-Fittig's reaction
You are given the mixture of two compounds A and B.
A = CH₃CH₂CH₂-NH₂ and B = CH₃CH₂NHCH₃
How would you separate their mixture by applying Hoffmann's method? Give the nitrous acid test to distinguish between compounds A and B. [3+2]
The metal 'M' with electronic configuration [Ar] 3d¹⁰4s² belongs to group IIB in the periodic table and is commonly called 'Jasta'.
a) Identify metal 'M' and write its main ore. [1]
b) Why is metal 'M' not considered as transition element? [1]
c) Draw the vertical retort. Write its reduction reaction. [2]
d) What happens when metal 'M' is exposed to air for a long time? [1]
What is rusting? Describe the electrochemical theory of rusting of iron. List any two methods for the prevention of rusting. [5]
Attempt all the questions.
[3×8=24]Deduce the normality equation, N₁V₁ = N₂V₂. Experimental data obtained by titrating decinormal solution of oxalic acid with potassium permanganate solution are given below. [2]
| Expt. No. | Volume of oxalic acid (ml) | Volume of KMnO₄ burrete reading (ml) | |
|---|---|---|---|
| initial | final | ||
| 1 | 10 | 0.0 | 11.5 |
| 2 | 10 | 0.0 | 11.0 |
| 3 | 10 | 0.0 | 11.0 |
a) Name the above titration. [1]
b) Calculate the equivalent weight of KMnO₄. [1]
c) Calculate the normality of KMnO₄ from the above data. [2]
d) Why is dil.H₂SO₄ added to the conical flask containing standard oxalic acid before titrating with KMnO₄ solution? [1]
e) Identify the titrant and titrand in this titration. [1]
OR a) Write the applications of solubility product principle and common ion effect in qualitative salt analysis. [4]
b) Differentiate between Bronsted-Lowry and Lewis concept of bases. [2]
c) Calculate the degree of ionization of HCN having concentration 0.01M (Kₐ of HCN = 4.8×10⁻¹⁰). Also calculate H⁺ concentration and pH of the solution. [2]
An organic compound (X) reacts with Grignard's reagent to give (Y), which on oxidation gives (Z). All of the compounds (X), (Y) and (Z) give positive iodoform test.
a) Identify the compounds (X), (Y) and (Z) with reactions and conditions involved. [3]
b) Why do these compounds give positive iodoform test? [1]
c) How would you convert compound (Y) into pseudonitrol? [2]
d) Write any two methods for the preparation of compound (Z). [2]
OR
How will you carry out the following conversions?
a) Ethanol into chloroform [2]
b) Phenol into DDT [2]
c) Ethoxyethane into methoxymethane [2]
d) Aniline into chlorobenzene [2]
Answer the following questions:
a) What are the raw materials for the production of paper? [2]
b) Draw the flowsheet diagram for the manufacture of Portland cement. [3]
c) Nuclear fusion reaction is also called thermonuclear reaction. Why? [1]
d) How are addition and condensation polymers formed? Write an example of each. [2]