Monday, 22 November 2021

PSEB/CBSE CHEMISTRY 10+2 GUESS PAPER

 

MODEL TEST PAPER : CLASS XII CHEMISTRY (TERM -1) ( FOR PSEB/ CBSE) 

NOTE: THERE WILL BE  35 multiple choice questions in the paper.
All questions are compulsory 




Q1 . For a non electrolyte solution Van't Hoff factor is 

  • (a) 1 

  • (b) 2
  • (c) 3
  • (d) 4 

  • (a) 1

Q2. When a nonvolatile solute is added in volatile solvent the 

  • (a) Lowering of vapour pressure occurs
  • (b) Elevation in boiling point 
  • (c) Depression in freezing point 
  • (d) All of these. 

  • (d) All of these. 


Q3. The osmotic pressure of 0.2 molar solution of urea 300K ( R=0.082 litre atm `mol^{-1}``K^{-1}` is 

  • (a) 1 atm
  • (b) 4.92 atm  
  • (c) 0.25 atm
  • (d) 27 atm

  • (b) 4.92 atm


Q4. What will be the molarity of 30 mL of 0.5 M  `H_{2}`S`O_{4}` solution diluted to 500ml?

  • (a) 0.3 M
  • (b)  0.03M 
  • (c) 3M
  • (d)  0.103M 

  • (b)  0.03M 

Q5. Which is supplied at the cathode of fuel cell? 

  • (a) `H_{2}`
  • (b) `N_{2}`
  • (c) `O_{2}`  
  • (d) `Cl_{2}`  

  • (c) `O_{2}`  


Q6. Molar conductance ...........with dilution, 

  • (a) decreases 
  • (b) Remains constant
  • (c) Increases 
  • (d) None of these

  • (c) Increases 


Q7. The e.m.f of the cell reaction Zn(s) + `Cu^{+2}`(1.0M) → Cu(s) + `Zn^{+2}` at 25℃ is  1.3V, `E^{0}` for cell reaction 

  • (a) 1.27 V 
  • (b) 1.21 V
  • (c) 1.31V
  • (d)  1.30V

  • (a) 1.27 V 


Q8. The conductivity of 0.20M solution of KCL  at 298K is 0.0248 S `cm^{-1}`

  • (a) 120 oh`m^{-1}``cm^{2}``mol^{-1}`
  • (b) 118 oh`m^{-1}``cm^{2}``mol^{-1}`
  • (c) 124 oh`m^{-1}``cm^{2}``mol^{-1}`   
  • (d) 130 oh`m^{-1}``cm^{2}``mol^{-1}`

  • (c) 124 oh`m^{-1}``cm^{2}``mol^{-1}`   


Q9. The rate of chemical reaction  

  • (a) Increases as the reaction proceeds
  • (b) decreases as the reaction proceeds 
  • (c) May Increases/decrease  during reaction 
  • (d) Remains constant as the reaction proceeds  

  • (b) decreases as the reaction proceeds 

Q10.Order and molecularity have same value  

  • a) Unimolecular Reaction 
  • (b) Bimolecular Reaction 
  • (c) Elementary Reaction  
  • (d) Trimolecular Reaction 

  • (c) Elementary Reaction  


Q11 .  The half life of the first order reaction having rate constant K= 1.7 x `10^{-5}``S^{-1}`


  • (a) 12.1 h
  • (b) 9.7h
  • (c) 11.3h  
  • (d) 1.8h 
  • (c) 11.3h  

Q12. The rate constant for a zero order reaction is 0.0030 `mol^{-1}``S^{-1}`. During which time, the initial concentration will fall from 0.10M to 0.0075M.

  • (a) 9.33 sec
  • (b)  7.05 sec
  • (c) 8.33 sec 
  • (d) None of these 

  • (c) 8.33 sec


Q13. . A reaction X →Y follows second order kinetics. If concentration of X is increased three times, the rate of formation of Y becomes .... 

  • (a) 3 times 
  • (b) 9 times 
  • (c) 2 times 
  • (d)  6 times 

  • (b) 9 times 


Q14. Which of the following is correct related to chemical adsorption?  

  • (a) Has weak Vander wall's  forces
  • (b) Reversible
  • (c) Highly selective in nature A
  • (d) forms multi molecular layers

  • (c) Highly selective in nature 

Q15. Milk is an example of colloidal system of 

  • (a) Gas in liquid 
  • (b)  liquid in liquid 
  • (c) Liquid in gas
  • (d)  Solid in liquid

  • (d)  Solid in liquid




MODEL/GUESS PAPER : 10+2 BIOLOGY MODEL QUESTION PAPER( WITH ANSWER)


GK OF TODAY

For all competition read important general knowledge questions


Q16.Which of the following properties of colloids does not depend on the charge on the properties

  • (a) Coagulation
  • (b) Electro-Osmosis
  • (c) Electrophoresis
  • (d) Tyndall effect 

  • (d) Tyndall effect 


Q17. Addition of Ferric Chloride to Ferric Hydroxide results in 

  • (a) Peptization
  • (b) Protection
  • (c) Dialysis 
  • (d) None of these

  • (a) Peptization


Q18. Formula of Galena is .......

  • (a) CuFe`S_{2}`
  • (b) PbS A
  • (c) ZnS
  • (d) HgS

  • (b) PbS 


Q19. The method in which ore is treated with suitable reagent so as to make it soluble is called ...

  • (a) Leaching   
  • (b) Magnetic separation
  • (c) Gravity separation
  • (d) None of these 

  • (a)  Leaching   

Q20. Which of the following elements does not form stable  diatomic molecules? 

  • (a) Iodine
  • (b) Phosphorus
  • (c) Nitrogen
  • (d) Oxygen

  • (b) Phosphorus. 



For all exam, read the gk of today

Q21 . Basic character of hydride of 15 group elements decrease in order

  • (a)  Sb`H_{3}` > P`H_{3}`> As`H_{3}`>N`H_{3}`
  • (b) N`H_{3}`> Sb`H_{3}` >  P`H_{3}`> As`H_{3}`
  • (c) N`H_{3}`> P`H_{3}`>  As`H_{3}`> Sb`H_{3}`  
  • (d) Sb`H_{3}`> As`H_{3}` > P`H_{3}`>N`H_{3}`
  • (c) N`H_{3}`> P`H_{3}`>  As`H_{3}`> Sb`H_{3}` 

Q22.  Oxygen molecule exhibits 

  • (a) Para magnetism 
  • (b) Dia magnetism
  • (c) Ferro magnetism
  • (d) None of these

  • (a) Para magnetism 


Q23. Which hydride is least volatile  

  • (a) `H_{2}`O 
  • (b) `H_{2}`S
  • (c) `H_{2}`Te
  • (d) `H_{2}`Se

  • (a) `H_{2}`O

Q24. The correct order of bond dissociation enthalpy of halogens

  • a) `Cl_{2}`>`Br_{2}``F_{2}`>`I_{2}` 
  • (b) `Cl_{2}`>`I_{2}`>`Br_{2}`>`F_{2}`
  • (c) `F_{2}`>`Cl_{2}`>`I_{2}`>`Br_{2}`
  • (d) All are wrong

  • a) `Cl_{2}`>`Br_{2}``F_{2}`>`I_{2}`

Q25. What is the shape of  Xe`F_{4}`?

  • (a) Tetrahedral
  • (b) Octahedral
  • (c) Linear
  • (d) Square planner 

  • (d) Square planner


Q26. Complete hydrolysis of Xe`F_{4}` and Xe`F_{6}`  forms

  • (a) XeO`F_{3}` 
  • (b) XeO`F_{2}` 
  • (c) Xe`O_{3}`  
  • (d)  XeO`F_{4}` 

  • (c) Xe`O_{3}` 

Q27. Which element does not belong to 3d series of transition elements?

  • (a) Titanium
  • (b) Iron
  • (c) Palladium 
  • (d) Vanadium

  • (c) Palladium


Q28. In 3d series of transition elements which elements exhibits largest number of oxidation states?

  • (a) Fe
  • (b) Mn       
  • (c) Cr
  • (d) CO

  • (b) Mn 


Q29. d-blocks elements show high catalytic property due to 

  • (a) High enthalpy of atomization
  • (b) Para magnetic behaviour
  • (c) Colour of hydrate ions 
  • (d) Variable oxidation state  

  • (d) Variable oxidation state

Q30. Which of the following will have higher magnetic moment?

  • (a) `Fe^{+2}`
  • (b) `Fe^{+3}`  
  • (c) `Zn^{+2}`
  • (d) `Sc^{+2}`

  • (b) `Fe^{+3}`


Q31 .  Which of the following statement is not correct? 

  • (a) Atomic Radius of Zr and Hf are same due to lanthanoid contraction 
  • (b) In lanthanoid series, ionic radius decreases from `La^{+3}` to `Lu^{+3}`  A
  • (c)La`( OH)_{3}` is less basic than Lu`( OH)_{3}`.      
  • (d) La is an element of transition series rather than lanthanoids 
  • (c)La`( OH)_{3}` is less basic than Lu`( OH)_{3}`.

Q32. La`( OH)_{3}` is ......... basic than  Lu`( OH)_{3}`.  

  • (a) more     
  • (b) less
  • (c) nearly same
  • (d) None of these

  • (a) more


Q33. What is the colour of `K_{2}` `Cr_{2}``O_{7}`     when it reacts with alkali?

  • (a) Yellow 
  • (b) Red
  • (c) Green
  • (d) Orange
  •  

  • (a) Yellow 


Q34. Which of the following Isomerism is shown by `[Co(Br)(NH_{3})_{5}]`S`O_{4}` and `[Co(SO_{4})(NH_{3})_{5}]Br`

  • (a) Ionization isomerism 
  • (b) solvate isomerism 
  • (c) linkage isomerism
  • (d) Co-ordination isomerism

  • (a) Ionization isomerism 

Q35.  Primary and secondary valency of platinum in [Pt `(en)_{2}` C`l_{2}`]

  • (a) 4,4
  • (b) 4,6
  • (c) 6,4
  • (d) 2,6

  • (d) 2,6



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