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Chemistry MCQ Question - Basic Concept

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1. Combustion analysis is performed to determine




2. Mostly elements have fractional atomic masses because of




3. Isotopes differ in




4. Which of the following is not a macromolecule?




5. Which of the following methods is used to estimate hydrogen in an organic compound?




6. Isotopes of the same elements has




7. The nucleus of an atom of every element will always contain




8. When cationic molecular ions are allowed to pass through strong magnetic field in mass spectrometer which of the following ions is fallen




9. When 0.5 mole of phosphoric acid is dissolved in aqueous solution how many moles of -ve and +ve ions are collected altogether?




10. For which of the following compounds the term empirical formula cannot be applied?




11. Dempsters mass spectrometer has number of zones / parts




12. The properties of an element mosly corresponds to that isotope which has greater




13. 1 a.m.u =




14. Which of the following has strongest intermolecular forces of attraction?




15. Which has strongest bonding in the solid state?




16. When substance moves from a solid to a liquid state all of the following changes occur except




17. When the atoms of third layer are arranged in such a way that they directly lie above the atoms of first layer then this arrangement is called




18. In order to mention the boiling point of water at 110?C the external pressure should be




19. Which one is false for evaporation?




20. Vapour pressure of water at 100?C is




21. Which one of the following does not show hydrogen bonding ?




22. Liquid crystal is discovered by




23. Which one is a conductor but is not malleable?




24. Hydrogen bonding is involved in




25. Actually the vapour pressure on the surface of liquid in the flask is equal to




26. Forces of attraction which may be present between all kinds of atoms and molecules are




27. The density of water may be




28. The quantity of heat required to convert one mole of liquid into its vapours at its boiling point is called molar heat of




29. Steam causes more sever burn than the boiling water because it possesses.




30. Water has maximum density at




31. The conversion of vapours back into their liquid state is called




32. Formation of vapours from the surface of a liquid is called




33. When water freezes at 0?C its density decreases due to




34. The ttractive forces between the partial positive end of one molecule and partial negative end of other molecule are called




35. The boiling point increases down the zero group element due to




36. Vapour pressure is not affected by




37. Rising of a wetting liquid in a capillary tube is due to




38. Table salt crystallizes with a




39. The number of formula units in 29.25g of common salt




40. During which process empty spaces between particles become minimum?




41. Liquid gets the shape of the container when it is poured into it. Which one of the following reasons justifies it?




42. Which one of the following has highest volatility




43. Molar heat of vaporization of water is




44. If we provide very high amount of heat to a liquid its boiling point will




45. Crystallites are present in




46. A solid may be made up of




47. A malleable solid is one which can be




48. Amorphous substances posses




49. Crystalline solids can be identified easily from their




50. Boiling points of hydrocarbons increase with the increase in number of carbon atoms. It is mainly due to