Test series Chemistry 12th Chapter 1 and 2

         Pathak’s Academy Spectrum

TEST SERIES: CHEMISTRY

Chapters 1,2

Section A

Q.no.1) Multiple choice question     7M

i) In body centered cubic structure the space occupied is about

a) 68% b) 53% c) 38% d) 32%

ii) Close packing is maximum in the crystal lattice of

a) Simple cubic b) Face centered c) body centered d) none 

iii) The major binding force in diamond is a) Covalent bond b) ionic bond c) metallic bond d) co-ordinate covalent bond

iv) The boiling point of water at high altitude is low because a) Low temp. b) Low pressure c) high temp d) high pressure

v) The temperature at which vapour pressure of a liquid becomes equal to atmospheric pressure is a) melting point b) boiling point c) 273K d) 373K

vi) Molal elevation  constant is elevation in boiling point produced by a) 1g solute in 100g solvent        b) 100g solute in 100g solvent c) 1mole solute in 1L of solvent d) 1 mole of solute in 1kg of solvent

vii) Which of the following is not a colligative property?

a) vapour pressure b) Depression in freezing point c) elevation in boiling point d) Osmotic pressure

Section B

Q.No.2) Solve any FOUR    8 M

i) Differentiate between tetrahedral and octahedral voids.

ii) A compound is formed by two elements M and N. The elements N formed ccp and atoms of M occupy 1/3rd of tetrahedral voids. What is the formula of the compound?

iii) Define Semi-permeable membrane and Osmotic pressure.

iv) Explain Raoult’s law .

v) What are the factors which affects the vapour pressure?

vi) Explain Schottky defect with example.

Section C

Q.No.3) Solve any FOUR     12 M

i) Explain defects in crystal structure.

ii) Differentiate between Crystalline and Amorphous solids

iii) Define: Molarity, Normality and Molality.

Iv) 0.15 molal solution of substance boils at 373.23 K. Calculate molal elevation constant of water 

(given: boiling point of water is 373.15K ).

v) Explain laws of osmotic pressure.

vi) Describe TWO main types of conductors.

Section D

Q.No. 4) Solve any TWO 8M

i) Derive expression for Density of Simple cubic and Body centered cell.

ii) Give seven systems of crystal lattice with their edge length and angle specifications.

iii) What is lowering of vapour pressure? Explain with suitable experiment.

iv) Explain graphically depression of freezing point on addition of solute.

Halogen Derivatives and Alcohol, Phenol, Ether

 Pathak’s Academy Spectrum 2024

Topics: Chapters 10,11

Marks: 25                                                                                                                 Time: 1h 

                                                                         Section - A

Q.No. 1 : Select and write the correct answer (any 5) [05]

i) Which of the following is used as source of dichlorocarbene

a. Tetrachloromethane b. Chloroform c. iodoform d. DDT

ii) Resorcinol on distillation with zinc dust gives

A. Cyclohexane B. Benzene C. Toluene D. Benzene-1, 3-diol

iii) The best method for preparation of alkyl fluorides is

a.Finkelstein reaction b.Swartz reaction c.Free radical fluorination d. Sandmeyer's reaction

iv) Identify the chiral molecule from the following.

a. 1-Bromobutane b. 1,1- Dibromobutane c. 2,3- Dibromobutane d. 2-Bromobutane

v) Anisole on heating with concentrated HI gives

A.Iodobenzene B.Phenol + Methanol

C. Phenol + Iodomethane D.Iodobenzene + methanol

vi) Ethers are kept in air tight brown bottles because

A. Ethers absorb moisture B. Ethers evaporate readily

C. Ethers oxidise to explosive peroxide D. Ethers are inert

vii) Choose the compound from the following that will react fastest by SN1mechanism.

a. 1-iodobutane b. 1-iodopropane c. 2-iodo-2 methylbutane d. 2-iodo-3-methylbutane

Section - B

Attempt any 5 [5 x 2 = 10 M]

i) Haloarenes are less reactive than halo alkanes.give reason

ii) Hydroboration-oxidation of propene gives.....

iii) Write structure of optically active alcohol having molecular formula C4H10O

iv) Arrange the following in the increase order of boiling points

a. 1-Bromopropane b. 2- Bromopropane c. 1- Bromobutane d.1-Bromo-2-methylpropane

v) Distinguish between - SN1 and SN2 mechanism of substitution reaction ?

vi) Explain why phenol is more acidic than ethyl alcohol.

                                                      

                        Section - C

Attempt any Two. [3 x 2 = 6 M]

i)Write structural formulae for

a. 3-Methoxyhexane b. Methyl vinyl ether c. 1-Ethylcyclohexanol

ii) Match the pairs.

        Column I                Column II

a. CH3 CH-CH3            i. vinyl halide

             X     

b. CH2=CH-CH2X       ii. alkyl halide

c. CH2=CH-X              iii. allyl halide

                                    iv. benzyl halide

                                    v. aryl halide

iI) Explain why p-nitrophenol is a stronger acid than phenol.

iii)  Convert the following.

i. Propene to propan-1-ol ii. Benzyl alcohol to benzyl cyanide iii. Ethanol to propane nitrile

 

Section - D

Attempt any One. [1 x 4 = 4 M]

i)  Give the reagents and conditions necessary to prepare phenol from

a. Chlorobenzene b. Benzene sulfonic acid.

ii) Give the equations of the reactions for the preparation of phenol from isopropyl

benzene.

 

12 th Chemistry: CHEMICAL THERMODYNAMICS

 Pathak's Academy Spectrum 2022

CHEMICAL THERMODYNAMICS

Section A (any 7)(7M)

1. Internal energy of a system of a molecule is determined by

A) Kinetic energy B) Vibrational movement C) Rotational movement D) All of these

2. In the reaction C + O2 → CO2 + Heat. The ΔH is A) Maximum B) Minimum C) Negative D) Positive.

3. Which of the following relationship is correct A) H=U-PV B) H=U+P+V C) H= U+PV D) H=-U+PV

4. For an ideal gas the relationship between internal energy change and enthalpy change is A) ΔH=U.PV B) ΔU=ΔH+P. ΔV C) ΔH=U-P. ΔV D) ΔH=ΔU+ΔNrt

5. The enthalpies of all elements in their standard states are A) Unity B) Zero C) Less than Zero D) Different for each element

6. All irreversible processes are A) Non-spontaneous B) In equilibrium C) Isothermal D) Spontaneous

7. An endothermic reaction is allowed to takes place rapidly in air. The temperature of the surrounding air A) Increases B) decreases C) Remains same D) Cannot be predicted

8. Which of the following process is reversible A) Evaporation of water at 100oC and 1atm pressure B) Melting of ice at 10oC C) Mixing of two gases by diffusion D) Non of these

9. ΔU of combustion of methane is –x KJ mol-1. The value of ΔHo is A) Equal to ΔU B) Greater than ΔU C) Less than ΔU D) Equal to zero

Q2 Define (4M)

a) Enthalpy b) Enthalpy of fusion c) Enthalpy of vaporization d) Enthalpy of atomization e) Enthalpy of ionization

Section B

I) What is Entropy? Describe with example (2M)

II) State Third law of Thermodynamics (2MSSection C 

(Any 3)(3X3= 9M)

I) Obtained relationship between ΔH and ΔU for reaction 

II)Define and explain Enthalpy of sublimation with example                         

III) Derive relationship between Bond enthalpy and enthalpy of a chemical reaction

IV) State Hess’s law of constant heat summation with eg.