Section −− AI. i) Very short answer type questions.

ii) Answer ALL questions.iii) Each question carries TWO marks. (10 ×× 2 = 20)

1. Calculate Kinetic energy of 2 moles of N2 at 27°C.2. Why SiO2 does not dissolve in water?3. What is limiting reagent? Name the limiting reagent in the

reaction of 50 kg of N2, 10 kg of H2 to get NH3.4. Can catalyst disturb the state of equilibrium.5. What is BOD? Give the possible BOD values of

a) Clean water b) Polluted water.6. a) Name the chemical that is used as antacid.

b) Name the main ingredient present in toothpaste.7. Name two adverse effects caused by acid rain.8. Mention the magnetic property and colour of the solution

when alkali metals are dissolved in NH3.

9. What is the hybridisation of carbon in a) Graphite b) Diamond c) Fullerene d) CO3

−2

10. Write the IUPAC names of the following.O O|| ||

a) b) CH3 − CHCl − C − CH3

Section −− BII. i) Short answer type questions.

ii) Answer any SIX questions.iii) Each question carries FOUR marks. (6 ×× 4 = 24)

11. Write any four postulates of Kinetic molecular theory ofgases.

12. Balance the following redox reaction in acid medium by ion− clectron method

Fe+2 + Cr2O7−2 → Fe+3 + Cr+3

13. Define heat capacity. Show that Cp − Cv = R.14. State Lechatlier's principle. Discuss the application of

Lechatlier's principle for the industrial synthesis of sulphurtrioxide.

15. State and write chain, position isomerisms with oneexample each.

16. Explain the structure of diborane.17. Explain a) Wurtz reaction b) Friedel Craft's alkylation18. What is hard water? Write a note on the Calgon's method

for the removal of hardness of water.

Section - CIII. i) Long answer type questions.

ii) Answer any TWO questions.iii) Each question carries EIGHT marks. (2 ×× 8 = 16)

19. a) What are the postulates of Bohr's model of the hydrogenatom.

b) Explain the significance of 'n' and 'l' quantum numbers.20. Define IE1 and IE2. Why is IE2 > IE1 for a given atom?

Discuss four factors that effect IE of an element.21. What is hybridization? Explain sp, sp2 and sp3 hybridiza-

tions with one example each.

email: help@eenadupratibha.netøŒEî¦ô¢Ù 15 íƇvñ÷J 2020

šú¤ÛûÂ - A

I. i) ÍAú£yõp ú£÷«ëůì ví£øŒoõª.ii) ÍEo ví£øŒoõÚÛª ú£÷«ëůû¦õª ô¦óŸªÙè….

iii) ví£Aví£øŒoÚÛª ·ôÙè[ª ÷«ô¢ª\õª (10 ×× 2 = 20)

1..-- 27°C ÷ë]Ì 2 îμ«öËÀõ N2 Þœ-A-á-øŒ-Ú¨hE ÚÛìª-ÚÁ\Ùè….-2..-- SiO2 F-æ¨ö˺ ÚÛô¢-Þœë]ª.- ÓÙë]ªÚÛª?3..-- í£J-NªêŸ Ú¥ô¢ÚÛÙ ÍÙç˶ ÔNªæ¨? 50 Ú¨.-vÞ¥.- N2, 10 Ú¨.-vÞ¥.- H2 õêÁ

NH3 Ô-ô¢pè˶ àŸô¢uö˺ í£J-NªêŸ Ú¥ô¢-Ú¥Eo êμõ-í£Ùè….-4..-- ú£÷ªê¦ ú‡–AE Ñwê¶p-ô¢ÚÛÙ ví£òÅ°-NêŸÙ à¶óŸª-Þœ-õë¯?5..-- BOD ÍÙç˶ ÔNªæ¨?

Óz øŒ‰ë]ÌÄ-Fô¢ªGz ÷³ô¢ª-Þœª-F-æ¨Ú¨ ÑÙè˶ BOD N-õª-÷-õìª êμõ-í£Ùè….-

6..-- Óz Î÷ªx NôÁ-CÅÞ¥ î¦è˶ ô¢þ§-óŸªì í£ë¯ô¢–ÙGz å«êÂ-›í-úÃdö˺ ÷³Üu Íìª-íÆ£ª-å-Ú¥-õìª ›íô•\-ìÙè….-

7..-- Î÷ªx ÷ô¦{õ ÷õx ÚÛL¸Þ ·ôÙè[ª ë]ªù£pÄ-L-ê¦-õìª êμõ-í£Ùè….-

8..-- vë]÷ Íîμ«t-E-óŸ«ö˺ ¤¥ô¢ ö˺-õìª ÚÛJ-T›úh Ôô¢pè˶ vë¯÷-é°-EÚ¨Óö°Ùæ¨ ÍóŸª-þ§\ÙêŸ ëÅ]ô¢tÙ, ô¢ÙÞœª ÷þ§hô³?

9..-- Óz vÞ¥šíÆjæÀ Gz èËμj÷ªÙèÂú‡z íÆ£±õx-Kû è…z CO3

−2 õö˺ Ú¥ô¢(û ú£ÙÚÛ-K-ÚÛ-ô¢-é°Eo êμõ-í£Ùè….- 10..-- Ú¨ÙC ú£î¶ªt-üŒ-û¦õ IUPAC ›í-ô¢xìª êμõ-í£Ùè….-

O O|| ||

Óz Gz CH3 − CHCl − C − CH3

šú¤ÛûÂ - B

II. i) ú£yõp ú£÷«ëůì ví£øŒoõª.ii) Ôî�μjû¦ Îô¢ª ví£øŒoõÚÛª ú£÷«ëůû¦õª ô¦óŸªÙè….

iii) ví£Aví£øŒoÚÛª û¦õªÞœª ÷«ô¢ª\õª (6 ×× 4 = 24)

11..-- î¦óŸ³-÷±õ Íéª-àŸ-õì ú‡ë¯ÌÄÙ-êŸÙ-ö˺E û¦õªÞœª ví£A-ð§-ë]-ì-õìªêμõí£Ùè….-

12..-- Ú¨ÙC Jè¯ÚÂq àŸô¢uìª Î÷ªx-óŸ«-ì-ÚÛÙö˺ ÍóŸ«û n- Óõ-vÚ¥dû í£ë]ÌÄ-Aö˺꟪õuÙ à¶óŸªÙè….-

Fe+2 + Cr2O7−2 → Fe+3 + Cr+3

13..-- Ñù£g-ëů-ô¢é ÍÙç˶ ÔNªæ¨? Cp − Cv = R ÍE àŸ«í£Ùè….-14..-- Mÿ§-æ¨x-óŸªô EóŸª-÷«Eo Eô¢y-#Ù-àŸÙè….- ú£õpÄô wçËμj ηÚj¬qè êŸóŸ«-Kö˺

Mÿ§-æ¨x-óŸªô ú£«vêŸÙ Ñí£-óμ«-Þ¥Eo N÷-JÙ-àŸÙè….- 15..-- øŒ”ÙÜõ, þ§–ì þ§ë]”-ø‹u-õìª Eô¢y-#Ù#, ÖÚÁ\ ë¯EÚ¨ ÖÚÛ Ñë¯--ô¢é

ô¦óŸªÙè….-16..-- èËμjò˺-¸ôû Eô¦t-é°Eo N÷-JÙ-àŸÙè….-17..-- Óz ÑôÂdâËÀ àŸô¢u

Gz víƈè[-öÀ n- vÚ¥íÆÃd ÎöËμj¬\-ö˶-ù£û àŸô¢u-õìª N÷-JÙ-àŸÙè….-18..-- ÚÛJÈ-ì-áõÙ ÍÙç˶ ÔNªæ¨? Fæ¨ Ú¥JÈ-ìu-êŸìª Ú¥ö°_û í£ë]ÌÄ-Aö˺ ê•õ-TÙà¶

Nëů-û¦Eo N÷-JÙ-àŸÙè….-

šú¤ÛûÂ - C

III. i) Dô¢+ ú£÷«ëůì ví£øŒoõª.ii) Ôî�μjû¦ ·ôÙè[ª ví£øŒoõÚÛª ú£÷«ëůû¦õª ô¦óŸªÙè….

iii) ví£Aví£øŒoÚÛª ÓENªC ÷«ô¢ª\õª (2 ×× 8 = 16)

19..-- Óz šïj°vèÁ-áû í£ô¢-÷«-éª÷± ò˺ô ì÷´û¦ ví£A-ð§-ë]-ì-õìª êμõ-í£Ùè….- Gz n, l Ú¥yÙåÙ ú£ÙÜuõ vð§÷³-Üu-êŸìª N÷-JÙ-àŸÙè….-

20..-- IE1, IE2 õìª Eô¢y-#Ù-àŸÙè….- Ô-ëμjû¦ í£ô¢-÷«-éª-÷±ö˺ IE2 > IE1 Þ¥ÓÙë]ªÚÛª ÑÙåªÙC? ÖÚÛ ÷´õ-ÚÛí£± IE E ví£òÅ°-NêŸÙ ඛú ÍÙø‹-õìªàŸJaÙ-àŸÙè….-

21..-- ú£ÙÚÛ-K-ÚÛ-ô¢éÙ ÍÙç˶ ÔNªæ¨? sp, sp2, sp3 ú£Ù-ÚÛ-K-ÚÛ-ô¢-é°-õìª ÖÚÁ\Ñë¯--ô¢-éêÁ N÷-JÙ-àŸÙè….-

JUNIOR INTER MODEL PAPER - 2020Time: 3 Hours Chemistry (English Medium) Max. Marks: 60

BOARD OF INTERMEDIATE EDUCATION

JUNIOR INTER MODEL PAPER - 2020Chemistry (Telugu Medium)

Time: 3 Hours Max. Marks: 60

1. Explain Lewis acid - base theory withexamples.

A: Acid: Electron pair acceptor.H All cations: Co+3, H+, Fe+3

H Elements with e− sextet : O, S.H Incomplete octet : AlCl3, BCl3H Molecules with vacant d − orbitals: SF4BASE: Electron pair donor.H Anions: F−, Cl−, OH−

H Molecules with lone pairs: ••NH3, H

••O••

HH Molecules with multiple bonds:

H − C ≡ C − H2. Define normality. Calculate the mass of

Na2CO3 required to prepare 250 ml of 0.5 Nsolution.

A: Normality: The number of gram equiva-lents of solute present in 1000 ml of a solu-tion.

W 1000N = ⎯⎯⎯ × ⎯⎯

G.E.W V (ml)W 1000

0.5 = ⎯ × ⎯⎯53 250

0.5 × 53 × 250 ∴ W = ⎯⎯⎯⎯⎯ = 6.63 g

10003. Define molarity. Calculate the volume of 0.1

M KMnO4 required the react with 100 ml of

0.1 M H2C2O4.2H2O solution in presenceof H2SO4.

A: Molarity: The number of gram moles ofsolute present in 1000 ml of a solution.

W 1000M = ⎯⎯⎯ × ⎯⎯

G.M.W V (ml)KMnO4 Oxalic acidV1M1 V2M2⎯⎯ = ⎯⎯

n1 n2V1 × 0.1 100 × 0.1 ⎯⎯⎯ = ⎯⎯⎯

2 5∴ V1 = 40 ml

4. a) What is inert pair effect?b) Give the formula, structure, common

name of borazine.

A: a) Inert pair effect: The reluctance of pairof ns electrons to take part in bonding.

b) B3N3H6 − Inorganic benzene4. Explain the formation of coordinate covalent

bond with one example.A: Coordinate covalent bond: A special type

of covalent bond, formed between donoratom (donates electron pair) and acceptoratom (accepts electron pair) by sharing theelectron pair. It is shown by

e.g.: H −••O •• + � H+ ⎯→ [H −

••O − H] +

⏐⏐ ⏐⏐H H

1. 360 cm3 of CH4 gas diffused through aporous membrane in 15 minutes. Undersimilar conditions, 120 cm3 of another gasdiffused in 10 minutes. Find the molar massof the gas. ⎯⎯⎯⎯

rCH4 Munknown

A: ⎯⎯⎯⎯ = √ ⎯⎯⎯⎯runknown MCH4

⎯⎯⎯⎯VCH4

tunknown Munknown⎯⎯⎯ × ⎯⎯⎯⎯⎯⎯ = √ ⎯⎯⎯⎯

tCH4 Vunknown MCH4

⎯⎯⎯⎯360 10 Munknown⎯⎯⎯ × ⎯⎯⎯ = √ ⎯⎯⎯⎯15 120 16

squaring on both sides

Munknown = 16 × 2 × 2 = 64 g/mol

2. Define a) Enthalpy b) Entropy.

A: Enthalpy: The Total heat content of asystem at constant pressure andtemperature.

Entropy: The degree of disorderness ofmolecules of the system.

3. Calculate the oxidation number of oxygenelement in the given species.a) CaO2 b) OF2

A: a) CaO2 b) OF2

+2 + 2x = 0 x + 2(−1) = 0∴ 2x = − 2 x − 2 = 0

x = −1 x = +2

4. What is Sink? Give two examples.

A: SINK: The medium which reacts with thepollutant. e.g.: Trees, Sea Water

-ANS Sankara Rao

2 Marks Questions

4 Marks Questions

H⏐⏐

BH − N N − H

⏐⏐ ⏐⏐⏐⏐

H − B B − HN⏐⏐H

Target-2020Junior Inter

Chemistry100100

What is Sink?

email: help@eenadupratibha.netøŒEî¦ô¢Ù 15 íƇvñ÷J 2020

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v) ÏC ÍGÅ-÷”CÌÄ àμÙCì@÷±ö˺x áô¢ª-Þœª-꟪ÙC.-

vi) C6H12O6 + 6O2

→ 6CO2 + 6H2O + 686 k.cal

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vi) C6H12O6 →C2H5OH + 2CO2 +

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