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IIT Chemistry Of Lighter Metals

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1. The ignition mixture in Alumino-thermite process contains a mixture of




2. Zone refining process is used for the




3. Which element amongst the following has the highest boiling point?




4. The principal ore of aluminium is.




5. Which of the following metals never occurs in free state in nature?.




6. Which of the following methods is used for concentration of bauxite ore?




7. Froth floatation process is used for the concentration of.




8. The most abundant element in earths crust is.




9. Beryllium shows diagonal relationship with.




10. The salt which is least likely to be found in minerals is




11. Which of the following metals is the most abundant in the earths crust?.




12. Which of the following is not an alkali metal?




13. Which of the following metals can be extracted by smelting?.




14. Which of the following barium salts is soluble in water.




15. Chlorophyll the main pigment responsible for absorption of light in plants contains.




16. Solvays process is used for the manufacture of.




17. The wire of flash bulb is made up of




18. When NaCl is dissolved in water the sodium ion is.




19. Slag is formed by reaction between




20. The impurities associated with the ore after mining are collectively called.




21. Which of the following statements is correct regarding the slag obtained during the extraction of a metal like copper or iron?The slag is lighter and has lower melting point than the metalThe slag is heavier and has lower melting point than the metalThe slag is lighter and has higher melting point than the metalThe slag is heavier and has higher melting point than the metal.Which of the following statements is correct regarding the slag obtained during the extraction of a metal like copper or iron?




22. Which of the following statements is correct?




23. In which of the following minerals aluminium is not present?




24. Sodium hydroxide solution reacts with phosphorus to give phosphine. To bring about this reaction we need




25. At high temperature nitrogen combines with calcium carbide to give




26. Which of the following is an ore of potassium?




27. Potassium is stored under.




28. The approximate percentage of gypsum in Portland cement is




29. Alkali metals do not exist in free state in mature because these aremetallic in naturehighly electronegative elements.




30. The substance which is added to ore in order to remove impurities during smelting is called




31. Smelting is generally carried out in




32. Alkali metals can be extracted from their salts by




33. Heating pyrites in air to remove sulphur is known as




34. Which of the following metals is always found in free state?




35. The metallic luster exhibited by sodium is explained by




36. Caustic soda is




37. The reason for floating of ore particles in concentration by froth floatation process is that




38. Molten sodium chloride conducts electricity due to the presence of