| May 20th, 2017 11:35 AM | |
| prince karak | Re: jexpo ans key Ok, I am providing you the solved question paper of JEXPO Exam. JEXPO Exam solved question paper Chemistry 1. Phenolphthalein is an : a) Acid Salt b) Acid c) Alkali d) Indicator Ans: d) Indicator 2. Coagulant used for the treatment of waste water is: a) NaCl b) Na2SO4 c) FeSO4 d) KCl Ans: c) Na2SO4 3. Most commonly used vulcanising agent is : a) Sulphur b) Dimond c) Graphite d) Phosphorous Ans: a) Sulphur 4. Which of the following compounds decolorised red bromine water solution: a) CH4 b) C2H6 c) C2H4 d) CCl4 Ans: CCl4 5. Which of the following compounds contains a double bond : a) C2H2 b) CH4 c) C2H4 d) C2H4 Ans: c) C2H4 6. What is the pH value of 10-8N HCL: a) 8 b) 6 c) 6.98 d) 9 Ans: a) 8 7. Galvanization means plating by : a) Zn b) Sn c) Ni d) Cu Ans: a) Zn 8. For cathodic protection the mostly used metal is : a) Zn b) Ca c) Ni d) Mg Ans: a) Zn 9. Which can stop bleeding due to small cut most easily ? : a) K2SO4 b) NaCl c) Sugar d) Alum Ans: d) Alum 10. Natural rubber consists of : a) 1,3 butadiene b) Isoprene c) But-1-ene d) Styrene Ans: a) 1,3 butadiene 11. Which is used as lubricant? : a) NaOH b) FeCl3 c) H3PO4 d) MoS2 Ans: d) MoS2 12. Picric acid is : a) 2,4,6 trinitro benzoic acid b) 2,4-dinitro benzoic acid c) 2,6-dinitro phenol d) 2,4,6-trinitro phenol Ans: d) 2,4,6-trinitro phenol 13. The compound used in plastic industry : a) C2H4 b) HCHO c) C6H5OH d) All of them Ans: d) All of them 14. Which one of the following elements in coal decreases its Calorific value : a) Nitrogen b) Hydrogen c) Sulphur d) Carbon Ans: a) Nitrogen 15. A chemical reaction is at equilibrium when : a) The reactants are completely transformed in to products b) The rate of froward and backward reactions are equal c) Formation of product is stoped d) Equal amount of reactants and products are present Ans: d) Equal amount of reactants and products are present 16. Octane number of Isooctane is : a) 0 b) 100 c) 92 d) 104 Ans: b) 100 17. Corrosion is a process of : a) Oxidation b) Reduction c) Precipitation d) Sublimation Ans: a) Oxidation 18. Temporary hardness of water is due to : a) CaCl2 b) MgSO4 c) Ca(HCO3)2 d) CaCO3 Ans: c) Ca(HCO3)2 19. The suitability of a diesel fuel is determined by : a) Octane Number b) Length of hydrocarbon chain c) Cetane number d) % of carbon Ans: c) Cetane number 20. Which one produces red ppt. with ammoniacal Cu2Cl2 : a) Ethene b) Ethane c) Ethyne d) both a and c Ans: d) both a and c 21. DDT is obtained when chlorobenzene is treated with the following in presence of con. H2SO4 : a) CH3CHO b) HCHO c) CCl3CHO d) CH3COOH Ans: c) CCl3CHO 22. The main constituent of LPG is : a) Methene b) Butane c) Ethane d) Propane Ans: b) Butane 23. How many atomes are present in 0.98 gm H2SO4 : a) 6.023 x 1021 b) 3.012 x 1023 c) 4.21 x 1022 d) 3.02 x 1021 Ans: a) 6.023 x 1021 24. A fuel gas, which is also used as a source of hydrogen is : a) Producer gas b) Coal gas c) Water gas d) Natural gas Ans: c) Water gas 25. The number of molecules in 1 mole methane (CH4) at 546 K and under 2 atmosphere pressure is : a) N b) 2N c) >N but <2N d) <N Ans: a) N For more questions here is the attachment |
| May 20th, 2017 11:33 AM | |
| Unregistered | Re: jexpo ans key I want the sample question paper of JEXPO Exam for preparation so can you provide me? Also provide me their answer key? |
| June 4th, 2016 12:45 PM | |
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