(GK) Science: Chemistry

(GK) Science: Chemistry
1. Presence of bicarbonates of Calcium and Magnesium in water leads toAns : Temporary hardness of water2. Stainless steel containsAns : Iron, Chromium and Nickel3. White phosphorus is stored undera. Palm oilb. Sodium Nitratec. Waterd. Liquid AmmoniaAns : C4. Which gas comes in third position in volume in atmosphere after Nitrogen & Oxygena. Neonb. Carbon dioxidec. Carbon monoxided. ArgonAns : D5. Amalgam is an alloy in which one of the compound isa. Zincb. Mercuryc. Platinumd. SilverAns : B6. Atomic number is equal toa. Number of protonsb. Number of electronsc. Total number of protons and electronsd. Total number of protons and neutronsAns : A7. The anti-knocking compound used in petrol in order to enhance the capacity of petrol engine isAns : Tetra Ethyl Lead8. ‘Aqua Regia’ is a mixture ofAns : Hydrochloric acid and Nitric acid9. The chief chemical component of pearl isAns : Calcium carbonate10. Global warming is due to increased production of all the following, excepta. Methaneb. Sulpher dioxidec. Ethaned. Carbon dioxideAns : Carbon dioxide11. Which acid is present in lemonAns : Citric acid12. Brass is an alloy of copper andAns : Zinc13. The hardest natural substance known in the world isAns : Diamond14. Permanent hardness of water may be removed by the addition ofAns : Sodium carbonate15. Which is Vinegara. Oxalic acidb. Citric acidc. Acetic acidd. A mixture of all the aboveAns : C16. Which of the following gas is used in cigarette lightersa. Butaneb. Propanec. Radond. MethaneAns : A17. Baking Soda is also known asAns : Sodium bicarbonate18. Bond order of a molecule can be at the maximum ofa. 2b. 3c. 4d. 5Ans : B19. Neutral molecules in which one of the carbon atoms has six valence electrons are calledAns : Carbenes20. Which of the following is non-radioactivea. Cobalt − 60b. Deuteriumc. Tritiumd. odine − 129Ans : B21. Which of the following is a thermo setting plastica. Teflonb. PVCc. Polythened. BakeliteAns : B22. Octane number of petroleum can be increased bya. Atomizationb. Adding catalystsc. Heating with H2d. DehydrogenationAns : A23. Atoms of the same element having the same atomic numbers but different atomic weights are calledAns : Isotopes24. What is the main constituent of soapAns : Sodium hydroxide25. Name a fertilizer that contain maximum amount of NitrogenAns : Urea26. Which compound is called oil of wintergreenAns : Methyl Salicylate27. What is alumAns : Potassium Aluminium Silicate28. A minute amount of radio isotope is calledAns : Tracer29. Name an alloy of copper, antimony and tinAns : Babbitt metal30. Which is the most commonly used bleaching agentAns : Chlorine31. Which among the following elements is stored in kerosenea. Fluorineb. Iodinec. Potassiumd. SodiumAns : D32. The main component of egg shell isAns : Calcium carbonate33. Which type of fire extinguisher is used for extinguishing petroleum fireAns : Powder type34. The purest form of carbon isAns : Diamond35. A substance which can react chemically as either an acid or a base is known asAns : Amphoteric36. Which one of the following metals has the highest densitya. Goldb. Platinumc. Leadd. IronAns : B37. Give an example for a Tribasic acidAns : Phosphoric acid38. What is ‘White Vitriol’Ans : Zinc Sulfate39. Which among the following element is stored under watera. Sodiumb. White Phosphorousc. Leadd. PotassiumAns : B40. Cyanide Process is widely used to extracta. Goldb. Titaniumc. Copperd. ManganeseAns : A41. What is commonly known as ‘Blue vitriole’Ans : Copper sulfate42. Deuterium is an ………. of HydrogenAns : Isotope43. Fluorspar is the ore ofAns : Calcium44. The gas used in refrigerators and ice plants isa. Ammoniab. Carbon dioxidec. Teflond. Calcium carbonateAns : A45. Carbon monoxide is readily absorbed bya. Magnesiumb. Copperc. Nickeld. AluminiumAns : C46. Synthetic ethanol is produced by reacting ethane (in the presence of phosphoric acid) withAns : Hydrogen47. What is called in the bond between two amino acids in proteinAns : Peptide bond48. Which of the following is not a noble gasa. Argonb. Siliconc. Radond. NeonAns : B49. Which metal remains in liquid form at normal temperatureAns : Mercury50. Common salt (Sodium Chloride) when kept open absorbs moisture from air. This is due to the presence ofa. Ammonium Chlorideb. Sodium Carbonatec. Potassium Chlorided. Magnesium ChlorideAns : D