(I2th CLASS - 12012)
CHEMISTRY , GROUP FIRST
TIME: 20 MINUTES
MARKS: 17
OBJECTIVE
NOTE: You have four choices for each objective type question as .A , B , C and D . The choice which you think is correct, fill that circle in front of that question number. Use marker or pen to fill the circles. Cutting or filling two or more circles will result in zero mark in that question.

• Hyrogen can be placed at the top of VII A group in the periodic table because
  
  (A) It is electropositive
  (B) It can lose one electron
  (C) It accepts an electron  
  (D) It forms acidic oxides
  
  
• Beryllium reacts with sodium hydroxide to form
  
  (A) BeO +NaH          
  (B) Na₂BeO₂ + H₂
  (C) BeO₂ + H₂
  (D) Be(OH)₂ + Na
  
  
• Chemical garden is formed by using compound
  
  (A) Sodium carbonate
  (B) Sodium Silicate
  (C) Asbestos
  (D) Soap stone
  
  
• Aqua Regia contains Nitric acid and Hydrochloric acid in the ratio of
  (A) 1:1
  (B) 1:2
  (C) 1:3     
  (D) 3:1 
  
  
• Chlorine heptaoxide (Cl₂O₇) reacts with water to form
  
  (A) Hypochlorous acid
  (B) Chloric acid
  (C) Perchloric acid
  (D) Chlorine and Oxygen
  
  
• The transition metal complex I [Cu(NH₃)₄] ⁺² has geometry
  
  (A) Tetrahedral
  (B) Octahedral
  (C) Square planer
  (D) Trigonal pyramidal
  
  
• Which set of hybrid orbitals has triangular shape
  
  (A) SP    
  (B) SP³
  (C) SP²           
  (D) dSP²
  
  
• Hydrogenolysis of an alkyl halide takes place in the pressure of catalyst
  
  (A) N₂H₄ / KOH
  (B) Zn — Hg / HCI
  (C) Pd / c
  (D) Ni — Al
  
  
• The C — C bond length in benzene is
  
  (A) 1.32 °A
  (B) 1.397 °A
  (C) 1.20 °A
  (D) 1.54 °A 
  
  
•  Which of the followings is not a nucleophile
  
  (A) SO₃
  (B) NH₃
  (C) H₃O
  (D) CN
  
  
• When diethyl ether is treated with PCI₅ , the product is
  
  (A) Ethyl chloride        
  (B) Ethanol      
  (C) Triethyl phosphine
  (D) Oxoniurn Ion
  
  
• Cannizzaro's reaction is not given by
  
  (A) Formaldehyde        
  (B) Acetaldehyde          
  (C) Benziildehyde        
  (D) Trimethyl acetaldehyde
  
  
• Reaction of HCN with CHACHO is an example of the reaction
  
  (A) Electrophonic addition reaction
  (B) Nucleophilic addition reaction
  (C) Nucleophilic substitution              
  (D) Electrophilic substitution reaction
  
  
• Which    of the following acid is used to prepare Synthetic fiber                   .
  
  (A) Formic Acid
  (B) Acetic Acid
  (C) Oxalic Acid
  (D) Carbonic Acid
  
  
• Which one of the following elements is not present in all types of protein molecules
  
  (A) Carbon
  (B) Sulphur
  (C) Hydrogen
  (D) Nitrogen
  
  
• Which of the followings is not a calcarious material
  
  (A) Lime
  (B) Clay           
  (C) Marble
  (D) Marine shell
  
  
• Newspaper can be recycled again and again by how many times

(A) 2      
(B) 3    
(C) 4      
(D) 5

CHEMISTRY
12^th CLASS -2012
MARKS 68
SUBJECTIVE

SECTION-I

Question NO. 2 Write short answer, any Eight (8) questions of the following: 16

• The oxidation states vary i i is period but remain almost constant in a group , why
• How do you justify that ZnO is amphoteric in nature
• Why lime is added to an acidic soil?
• Discuss in which respect KO₂ can be used by mountaineers 
• Why the aqueous solution of Na₂CO₃ is alkaline in nature
• What are silicones?
• Why are liquid silicones proffered over ordinary organic lubricants?
• Write the names of any two important lead pigments with their colour
• What are freons ? Give thin two uses
• What are non-typical trans lion elements and why are they called so ?
• What do you mean by knocking in internal combustion engine
• Write two examples of (motional group isomers

QUESTION N0.3 Write short answer! any Eight (8) questions of the following:  16

• How is Aqua Regia prepared ? What is its use
• Write the changes which occur on heating H₃PO₄ ?
• How is ethane prepared by Kolb's electrolytic process by using DI-sodium succinate ?
• Give reaction of conversion of Acetone to propane by Clemmensen's reduction process ?
• Why is Benzene less reactive than ethene but more reactive than ethane?
• Prepare benzene by hydrolysis of Benzene sulphonic acid with steam or boiling with dilute HCl.     
• Write the reaction of ethyl magnesium bromide with CO₂?
• Why do we observe 50% nversion of configuration and 50 % retension of configuration of product during SN^-1 reaction mechanism ?
• How is Acetaldehyde prepared by heating mixture of calcium formate and calcium acetate ?
• Write cannizzo's reaction of formaldehyde?
• Define macromolecule ant give two examples of natural macromolecules ?
• What do you mean by thermosetting plastics or polymers ? Give two examples

QUESTION N0.4 Write short answer! any Six (6) questions of the following: 12

• Water has higher boiling point than ethanol, give reason
• Discuss Williamson's Synthesis
• How absolute Alcohol can be prepared
• Phenol is acidic in nature , explain with reason            
• What are Zwilter ions ?
• Write four uses of acetic acid?
• Write down essential qualities of good fertilizer
• Explain setting of cement                                   
• What is Leachate ?

SECTION-II             

Attempt any Three questions from this section  (8 *3 =24)

Q NO.5
(a) Explain periodic trend in the following physical properties (4)
(i) Electron Affinity       
(ii) Ionic radius
(b) Describe with diagram the manufacture of sodium by Down's cell   (4)
 
Q NO.6
(a)    What    is hybridization? Discuss in! formation of Ethyne  (4)
(b) Discuss SN₂ Mechanism with one example    (4)

Q NO.7
(a) Discuss in detail rules for naming alkanes by IUPAC system   (4)
(b) Explain the mechanism of the reaction of Phenyl hydrazine with acetone in acidic Medium (4)

Q NO.8
(a) Detail out two reactions in which t enzene behave as if it is saturated Hydrocarbon and two Reaction  in which it behave as if it is unsaturated Hydrocarbon  (4)
(b) Convert acetic acid into  (4)
(i) Acetyl chloride  
(ii) Ethane   
(iii) Acetamide   
(iv) Ethyl alcohol      

Q NO.9
(a) What are complex compounds ? Briefly describe any three corn e                                                 
(b) What is Acid rain ? And how does it affect our environment?

CHEMISTRY
TIME: 20 MINUTES
MARKS: 17
OBJECTIVE

QUESTION NO. 1

•  Mark the correct statement
  
  (A) All lanthinides are present in same group
  (B) All Halogens are present in the same period 
  (C) All the Alkali metals are present in the same group 
  (D) All the noble gases are present It the same period 
   
• The oxides of beryllium are
  
  (A) Acidic
  (B) Basic
  (C) Ionic
  (D) Amphoteric
  
  
• Chemical fomiula of colemanite is
  
  (A) Ca₂B₆O₁₁. 5H₂O
  (B) CaB₄O₁₂. 4H₂O
  (C) Na₂B₄O₇. 4H₂O
  (D) CaNaB₅O₉.8H₂O
  
  
• Laughing gas is chemically
  
  (A) NO
  (B) N₂O
  (C) NO₂
  (D) N₂0₄
  
  
•  Hydrogen bond is strongest between the molecules of
  
  (A) HP
  (B) HCL
  (C) HBr
  (D) H₂O
   
• Which of the following is a typical transition element
  
  (A) Sc 
  (B) Y
  (C) Re
  (D) CO
  
  
•  The chemist who synthesized urea from ammonium cyanate was
  
  (A) Berzeihts
  (B) Kolbe
  (C) Wholer
  (D) Lavoisier
  
  
• Acetylene has a characteristic ethereal smell resembling that of
  
  (A) ginger
  (B) vinegar
  (C) garlic
  (D) Onion
  
  
• The catalyst used for the halogenation of benzene is
  
  (A) FeX₃
  (B) AICI₃
  (C) Pt
  (D) Ni
  
  
• Species deficient in electron are called
  
  (A) Electrophiles
  (B) Bases
  (C) Nucleophiles
  (D) Oxidizing agent
  
  
• Hydroxy propanoic acid is called
  
  (A) Oxalic acid
  (B) Lactic acid
  (C) Citric acid
  (D) Aspartic acid
  
  
• Ketones are prepared by the oxidation of
  
  (A) Primary alcohol
  (B) Secondary alcohol
  (C) tertiary alcohol   
  (D) methyl alcohol
  
  
• The compound which gives poitive test with Feliling's solution is
  
  (A) Acetic acid
  (B) Acetone
  (C) Ethyl acetate
  (D) Formaldehyde
  
  
• The reagent used to reduce a carboxylic group to an alcohol is
  
  (A) H₂/Ni
  (B) H₂IPt
  (C) NaBlig
  (D) LiAlHO
  
  
• Which of these polymers is an addition polymer
  
  (A) Nylon
  (B) Polystyrene
  (C) Terylene
  (D) Epoxy misen
  
  
• The fertilizer which contain 46 % N is
  (A) Area
  (B) Ammonia
  (C) Ammonium nitrate
  (D) Oniurn cyaoatc   

SUBJECTIVE
MARKS 68

2. Write short answers any Eight (8) questions of the following  (8 x 2 = 16)

• Why the elements of subgroup III-A to VIII A are called Piblock elements ?
• How does hydrogen resemble with elements of Group IV — A ?
• Why the aqueous solution of Na₂CO₃ is alkaline in nature?
• Give names and chemical formulas of nvo ores of calcium
• What is milk of magnesia ? 31here is io used ?
• What is peculiar behaviour of Boron ? Give four points
•  What is quartz? How is it diferent from CO₂ ?
• What is Boraz bead test ? Giv: its chemistry
• Give one reaction for the preparation of xenonoxy fluoride and xenon trioxide
•  Under what conditions does Aluminium corrode ?
• Which property makes carbon different horn other elements of the periodic table?
• What are Alicycl ie compact ? Give two examples

3. Write short answers any Eight (8) questions of the following  (8 x 2 =16)

• Write two reactions of nitric ihide (NO) with two reducing agents
• Write two reactions of sulphuric acid (H₂SO₄) as an oxidizing agent?
• How Raney nickel is prepare( and where it is used
• Why alkynes are less reactivt than alkenes , but more reactive than alkanes ?
• Give two reactions in which benzene acts as a saturated Hydrocarbon
• What is resonance and resonance energy?
• Give the reactions of ethyl aliohol with PBr₃ and PCl₅
• Give the reactions of ethyl mignesium bromide with
  (a) Ammonia and
  (b) Ethyl alcohol (C₂H₅OH)
• Give the mechanism of addition of HCN to acetone
• What is fonnaline and silveri rg of mirror?
• Give the importance of proteins
• Define the saponification no. and Iodine no.

4. Write short answers any Six (6) questions of the following   12

•  Write down reactions involved in the preparation of Ethanol by fermentation of Molasses
• How ethanol and Methanol a t distinguished from each other ?
• Give two preparation methods for ethers
• Give reactions of diethyl ether with
  (i) 111    
  (ii) PCl₅
• Write structural formulae of:
  (i) Phthalic acid
  (ii) Malonic acid
• Explain acidic and basic behaviour of amino acids
• What are Fertilizers? Why are they needed ?
• Discuss the reactions taking I lace in first 24 hours during setting of cement
• Name components of the env ronment             '

SECTION-II

Attempt any Three questions from this section

Q NO.5
(a)Write down two similarities and two dissimilarities
(b) Write down any four points to show r                                                                               

Q NO.6
(a) Define isomerism, nap  metarnerism                                 
(b) Give preparation f G so give in chemical reactions with        

Q NO.8
(a)  Describe Friedel Craft's Acylation                                                                                 
(b) Write mechanism of reaction of Acetic Acid with SOCl₂                                                  

Q NO.9
(a) Describe the Bessemer's process for the manufacturing of steel
(b) What is acid rain and how dots it affict our environment ?