Imp questions 12th Chemistry

 THE MOST IMPORTANT QUESTION (IMP)OF THE 12TH CHEMISTRY HSC MAHARASHTRA BOARD FOR THE BOARD EXAM.

SOLUTION AND COLLIGATIVE PROPERTIES

1. Define a) Solute b) Solvent

2. What are colligative properties?

3. What is relation between molecular mass and lowering vapour pressure?

4. Define  Ebullioscopic constant ?

5. What is Freezing Point?

6. Why the Aquatic life prefer to stay bottom of Sea?

SOLID STATE IMP QUESTION FOR MAHARASHTRA BOARD EXAM 2022

1. Differentiate between Amorphous and crystalline solids ?

2. What are different type of unit cell?

3. What is covalent ? Give its examples?

4. How many particle present in SCC, BCC, FCC unit cell?

5. What is relation of molar mass and density of unit cell ?

6. Co ordination number ?

7. What are defects in solids ?

IONIC EQUILIBRIA

1. Define electrolyte and non-electrolyte ?

2. What are acids and base ?

3. Hydrolysis of salt ?

4. what are buffer solution ?

5. Common ion effect ?

6. Hydrolysis of Sa + Sb ?

7. What is pH and poH ?

CHEMICAL THERMODYNAMICS 

1. Types of system ?

2. Identify extensive property and Intensive Properties?

3. What is work and Heart ?

4. Wmax=-2.303 nRT log 10 v2/v1

5. 1st Law of Thermodynamics

CHEMICAL KINETICS 

1. Define a) Rate law b) Rate of Reaction

2. Difference between order of reaction and molecularity of reaction ?

3. Integrated rate law for 1st /Zero order reaction ?

4. Half life for zero and 1st order ?

5. Effect of catalyst and temperature ?

6. Arrhenius equation ?

ELECTROCHEMISTRY

1. Difference between electrolytic cell and galvanic cell ?

2. Explain Electrolysis of fused Nacl ?

3. Faraday's 1st law ?(Numerical)

4. Ecell=Ec-Ea? (Numerical)

5. Nernst equation ? (Numerical)

6. What is Salt Bridge ?

7. Conductivity and molar conductivity ?

Elements of 16,17,18 group (6-8)

1. Electronic configuration 16,17,18 group ?

2. Anomalous behaviour of N, O, F

3. Variable oxidation state of element from following H2SO4 , H2SO7 ?

4. What is oxoacids ?

5. What is interhalogen compounds ?

6. What are uses of noble gas elements ?

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Test series :Halogen derivatives:12th

 Pathak’s Academy Spectrum 2022

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.

 

TEST SERIES: CHEMISTRY Chapters 1,2

 Pathak’s Academy Spectrum 2022

TEST SERIES: CHEMISTRY

Chapters 1,2

Section A

Q.no.1) Multiple choice question                        of  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.

Hydro-Carrbon : 11th class

 Q1. Select and Write the correct answer. (04)

 (a) Propane (b) Methane (c) Butane (d) Hexane

2. Which of the following compound has highest boiling point

(a) n-pentane (b) isobutane (c) butane (d) neopentane

3. Calcium carbide on reaction with H2O gives –

(a) Ethene (b) Ethane (c) Ethyne (d) Propyne

4. Acidic Hydrogen is present in –

(a) Ethane (b) Ethylene (c) Ethyne (d) Dimethyl Acetylene

Q2. Answer the following : (03)

1. Write the name of Isomers of Butane

2. Which compound is obtained by the aromatization reaction of n-Hexane

3. Write the structure of product obtained by dehydrohalogenation of Isopropyl bromide

Q3. Attempt any FOUR (08)

1. What is dehalogenation ? Write any one reaction of dehalogenation of vicinal dihalide to 

prepare alkene.

2. How will you prepare Acetaldehyde from Acetylene.

3. What is the action of (a) Cl2 and (b) H2 on prop-1-ene ?

4. Explain Friedel Craft alkylation reaction

5. Write a note on Wurtz reaction.

Q4. Attempt any TWO (06)

1. State and Explain Markovnikov’s rule with one example.

2. Explain Huckel rule of Aromaticity by giving two examples.

3. Identify A, B and C in the following reaction.

       CH3-CH=CH2      →    A         →      B       →    C

 Q5. A) Write the reaction of ozonolysis of ethene (02)

B) Write IUPAC names of the following compounds (02)

a) CH3-C-CH3= CH2  b). C2H5-C2H5-C-C2H5-C2H5

OR

A) How will you prepare benzene from (02)

a) Phenol b) Sodium benzoate

B) Write any four point of differences between Aromatic and Aliphatic compounds (02)

4th sem (6) : Create slides using different slide layouts

Aim:. Create slides using different slide layouts.

Apperatus :   A computer system having power point presentat

Diagram: 

Procedure : Apply a slide layout

1. Select the slide that you want to change the layout for.
2. Select Home > Layout.
3. Select the layout that you want. The layouts contain placeholders for text, videos, pictures, charts, shapes, clip art, a background, and more.

Result: A PPT has been created using different layouts

4th sem (5) : Creating and enhancing Power Point Presentation

 Aim : Creating and enhancing Power Point Presentation

Apperatus : A computer system with latest power point presentation.

Digram:

Procedure : Algorithm

Here is a way you can enhance it with music, images, and videos.

1. Crop Pictures to Fit Shapes

To add even more visual flair, you can also crop an image to make it automatically fit inside your shape.

2. Play Music in the Background During a Presentation

punch up your PowerPoint presentation with some tunes. While playing music in the background certainly isn’t always appropriate, adding audio for the duration of your presentation is an easy process that can make your slides a bit more interesting.

3. Combine Shapes to Create a Custom Shape

in PowerPoint, the standard shapes in the program might not suit your needs. We’ll show you how to merge multiple shapes to create your own custom shapes.

4. Add Sound Effects to Animations

The more interesting your PowerPoint slides are, the more engaged your audience will be. A great way to spice up your bullet points or images in a slide is to not only add animation, but to also add audio to the animation.

5. Remove the Background from a Picture

The Remove Background feature in PowerPoint 2016 helps you eliminate distracting backgrounds so the important parts of your image are front and center. In a few simple steps, you can create praiseworthy presentations and nobody will ever know you did all that fancy image editing right within PowerPoint.

6. Insert a Screenshot or Screen Clipping

A PowerPoint deck is a prime example of an Office document that brings together many types of rich media. And when you have a presentation with more than 20 slides, importing files can be tedious and take a lot of time. To help ease the time on image importing, the built-in screenshot button can speed up your PowerPoint deck creation.

7. Embed YouTube Videos

Incorporating rich media in your PowerPoint presentation is a sure way to keep your audience more interested. In PowerPoint 2013/2016, it’s as simple as a few clicks to embed a YouTube video into a slide. Whether you’re embedding a specific video, or need a clip from a famous movie to use as an analogy, find the right video and load it in your presentation in a matter of seconds.

Result : Created and enhanced Power Point Presentation.