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Question Paper - Chemistry 2015 - 2016-H.S.C-12th Board Exam Maharashtra State Board (MSBSHSE)

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Marks: 70
Q: 1 |  Select and write the most appropriate answer from the given alternatives for each sub-question: [7]
Q: 1.1[1]

The hybridisation of phosphorus in phosphorus pentachloride is _______.

(A) dsp3

(B) sp3 d

(C) d2 sp3

(D) sp3 d2

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Q: 1.2[1]

The rate constant for a first order reaction is 100 s–1. The time required for completion of 50% of reaction is _______.

(A) 0.0693 milliseconds

(B) 0.693 milliseconds

(C) 6.93 milliseconds

(D) 69.3 milliseconds

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Q: 1.3[1]

Silica is added to roasted copper ore during smelting process to remove _______.

(A) ferrous sulphide

(B) ferrous oxide

(C) cuprous sulphide

(D) cuprous oxide

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Q: 1.4[1]

96500 coulombs correspond to the charge on how many electrons?

(A) 1.6 X 1019

(B) 6.022 X 1020

(C) 6.022 X 1023

(D) 6.022 X 1024

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Q: 1.5[1]

For the reaction: Cl2(g) → 2Cl(g), _______.

(A) ΔH is positive, ΔS is positive

(B) ΔH is positive, ΔS is negative

(C) ΔH is negative, ΔS is negative

(D) ΔH is negative, ΔS is positive

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Q: 1.6[1]

The substance ‘X’, when dissolved in solvent water gave molar mass corresponding to the molecular formula ‘X3’. The van’t Hoff factor (i) is _______.

(A) 3

(B) 0.33

(C) 1.3

(D) 1

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Q: 1.7[1]

The relation a ≠ b ≠ c and α ≠  β ≠  γ represents which crystal system?

(A) Orthorhombic

(B) Tetragonal

(C) Triclinic

(D) Monoclinic

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Q: 2 | Answer any SIX of the following: [12]
Q: 2.1[2]

Define ebullioscopic constant. Write its unit.

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Q: 2.2[2]

State  Second law of thermodynamics in terms of entropy.

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State Third law of thermodynamics

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Q: 2.3[2]

What is the hybridisation of carbon atom in diamond and graphite?

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Q: 2.4[2]
Q: 2.4.1[1]

Draw structure of Chlorine trifluoride

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Q: 2.4.2[1]

Draw structure of Chlorine pentafluoride

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Q: 2.5[2]

Derive an expression for maximum work in isothermal reversible expansion of two moles of an ideal gas.

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Q: 2.6[2]

Can copper sulphate solution be stored in an iron vessel? Explain.

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Q: 2.7[2]

Define Average rate of reaction.

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Define  Instantaneous rate of reaction.

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Q: 2.8[2]

Define Hydrometallurgy?

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Define Electrometallurgy?

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Q: 3 | Answer any THREE of the following: [9]
Q: 3.1[3]

What is the action of dioxygen on:

a. Calcium

b. Iron

c. Carbon disulphide

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Q: 3.2[3]

A solution of glucose in water is labelled as 10% (W/W).

Calculate:

a. Molality

b. Molarity of the solution.

[Given: Density of solution is 1.20 g mL-1 and molar mass of glucose is 180 g mol-1 ]

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Q: 3.3[3]

Resistance of conductivity cell filled with 0.1 M KCl solution is 100 ohms. If the resistance of the same cell when filled with 0.02 M KCl solution is 520 ohms, calculate the conductivity and molar conductivity of 0.02 M KCl solution. [Given: Conductivity of 0.1 M KCl solution is 1.29 S m1 .]

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Q: 3.4[3]

Ammonia and oxygen react at high temperature as:

4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g) In an experiment, rate of formation of NO(g) is 3.6 x 10-3 mol L-1 s -1.

Calculate:

a. Rate of disappearance of ammonia.

b. Rate of formation of water.

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Q: 4 | Answer any ONE of the following: [7]
Q: 4.1[7]

What is the effect of temperature on solubility of a gas in a liquid?

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Explain refining of nickel by Mond process.

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State Kohlrausch’s law of independent migration of ions.

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Silver crystallises in F.C.C. (face-centred cubic crystal) structure. The edge length of the unit cell is found to be 408.7 pm. Calculate density of the unit cell.

[Given: Molar mass of silver is 108 g mol-1 ]

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Q: 4.2[7]

Write ‘four’ uses of hydrochloric acid.

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Write chemical formula of the following oxoacids of chlorine:

a. Hypochlorous acid

b. Chlorous acid

c. Chloric acid

d. Perchloric acid

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The equilibrium constant Kp for the reaction,

H2(g) + I2(g) → 2HI(g) is 130 at 510 K. Calculate ΔGo for the following reaction at the same temperature: 2HI(g) → H2(g) + I2(g) [Given: R = 8.314 J K-1 mol-1 ]

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Q: 5 | Select and write the most appropriate answer from the given alternatives for each sub-question: [7]
Q: 5.1[1]

Which among the following reducing agents is NOT used to reduce acetaldehyde to ethyl alcohol?

(A) Na-Hg and water

(B) Zn-Hg and conc. HCl

(C) H2-Raney Ni

(D) LiAlH4/H+

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Q: 5.2[1]

Acetaldehyde, when treated with which among the following reagents does NOT undergo addition reaction?

(A) Ammonia

(B) Hydroxylamine

(C) Ammoniacal silver nitrate

(D) Semicarbazide

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Q: 5.3[1]

What is natural rubber?

(A) Cis-1,4-polyisoprene

(B) Neoprene

(C) Trans-1,4-polyisoprene

(D) Butyl rubber

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Q: 5.4[1]

What is salvarsan?

(A) An antiseptic

(B) An antibiotic

(C) An antifertility drug

(D) An analgesic

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Q: 5.5[1]

Which among the following vitamins is also known as riboflavin?

(A) B1

(B) B2

(C) B6

(D) B12

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Q: 5.6[1]

The amine which reacts with nitrous acid to give yellow oily compound is _______.

(A) ethylamine

(B) isopropylamine

(C) secondary butylamine

(D) dimethylamine

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Q: 5.7[1]

What is the molecular formula of chromyl chloride?

(A) CrO2Cl2

(B) CrOCl2

(C) CrCl3

(D) Cr2OCl2

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Q: 6 | Answer any SIX of the following : [12]
Q: 6.1[2]

Identify ‘A’ and ‘B’ in the following reaction :

CH3 - CH = CH`(HBr)/()` ‘A’ `(alc. KOH)/()` ‘B’

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Q: 6.2[2]

Distinguish between lanthanoid and actinoids.

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Q: 6.3[2]

How are the following compounds prepared?

a. Benzyl alcohol from benzyl chloride.

b. Propan-1-ol from propanal

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Q: 6.4[2]

What is the action of acetic anhydride on:

a. ethylamine?

b. diethylamine?

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Q: 6.5[2]

What are monosaccharides?

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Draw ring structure of α - D - (+) - glucopyranose.

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Q: 6.6[2]

Explain Tranquilizers

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Explain cationic detergents.

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Q: 6.7[2]

What is Stephen reaction?

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Q: 6.8[2]

Explain Sidgwick’s electronic theory with suitable example

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Q: 7 | Answer any THREE of the following :[9]
Q: 7.1[3]
Q: 7.2[3]

What is peptide linkage?

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How is tripeptide formed?

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Q: 7.3[3]

Write the reactions involved in the preparation of Teflon

 

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Write the reactions involved in the preparation of Orlon

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Write the reactions involved in the preparation of  PVC

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Q: 7.4[3]

What is the position of iron (Z = 26) in periodic table?

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Explain why is Fe3+ more stable than Fe2+?

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Q: 8 | Answer any ONE of the following: [7]
Q: 8.1[7]

Discuss the mechanism of alkaline hydrolysis of bromomethane.

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How is carbolic acid prepared from chlorobenzene?

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What is the action of bromine water on carbolic acid?

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Q: 8.2[7]

Explain cationic complexes and anionic complexes of co-ordination compounds.

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Write the structure and IUPAC names of isomeric aldehydes having molecular formula C5H10O.

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Draw the structure of aspirin.

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