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Definitions and MCQs of Ninth Class Chemistry (Thermochemistry)


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In sha Allah no mcq will come out of this in the exams...!

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Definitions and MCQs of Ninth Class Chemistry (Thermochemistry)

  1. 1. Chapter 8Thermochemistry(To shine your face make nimaz (salah) basebecause life is race and in this case tofasten the pace don’t create mess)Chemistry Def. & MCQs Dr. Sajid Ali Talpur
  2. 2.  Definitions1. Electrochemistry: - It is the branch ofchemistry which deals with the relationship ofelectrical and chemical energies and theirinterconversion.2. Electrolyte: -The substance capable of beingdissociated into ions on the passage ofelectricity in the molten state.3. Non-eclectrolytes: - The chemical compoundswhich do not conduct electricity in molten oraqueous solutions are called non electrolytes.4. Electrolysis: -The breakage of a solution on thepassage of electric current.5. Anode: -the positively charged electrode whereoxidation occurs.6. Cathode: -the negatively charged electrodewhere reduction takes place is called cathode.7. Ampere: - It is the S.I unit of current which isdefined as the current when passed through acircuit for one second.8. Columb: - It is the S.I unit of electric chargeand is defined as the quantity of charge whenone ampere of current is passed for one second.Chemistry Def. & MCQs Dr. Sajid Ali Talpur
  3. 3. 9. Electroplating: - It is the process of electrolysiswhich is used to coat one metal onto the other.10. Electrochemical cell: - The cell which is usedto convert electrical energy into chemicalenergy and vice versa is called electrochemicalcell. Multiple Choice Questions1. Chemical and electrical energies are interconvertible:a) true b) false2. all acids, bases and salts are electrolytes inaqueous solutions or fused state.a) true b) false3. all the conductors are electrolytes.a) true b) false4. which of the following does not conductelectricity.a) salt b) waterc) sugar d) N.O.T5. all are true about cathode except:a) is negatively chargedb) positive ions move towards itc) oxidation takes place over itd) Na+ions become Nae) N.O.TChemistry Def. & MCQs Dr. Sajid Ali Talpur
  4. 4. 6. all are true about anode except:a) is positively chargedb) oxidation takes placec) Cl becomes Cl-d) negative ions moves towards ite) N.O.T7. Columb= ?a) current * time b) current / timec) current + time d) current – time8. 1F = ?a) 500C b) 6500Cc) 96500C d) 1000 C9. What is the charge when 2 A current passes for2 seconds:a) 1 b) 2c) 3 d) 410. electrolysis is used for the extraction of certainmetals from their ores.a) true b) false11. coating of metal by non metal is called platinga) true b) false12. a cell which converts electrical energy intochemical energy is called voltaic cella) true b) false13. lead storage battery is a reversible cell.a) true b) falseChemistry Def. & MCQs Dr. Sajid Ali Talpur
  5. 5. Answer Key1 A 2 A 3 B4 C 5 C 6 C7 A 8 C 9 D10 A 11 B 12 B13 AChemistry Def. & MCQs Dr. Sajid Ali Talpur
  6. 6. Answer Key1 A 2 A 3 B4 C 5 C 6 C7 A 8 C 9 D10 A 11 B 12 B13 AChemistry Def. & MCQs Dr. Sajid Ali Talpur