Title Advanced series 7th class Chemistry- Solutions.pdf ✅

Class 7 – Chemistry | A-7 States of Matter 1 1. States of Matter Solutions Physical Classification of Matter LEVEL-1 1. Correct option: (C) Book has some mass and occupies some volume, so book comes under matter. 2. Correct option: (C) Depending upon the temperature at which it is maintained, matter is classified into three forms mainly. 3. Correct option: (C) The quantity of matter that present in an object is known as mass. 4. Correct option: (C) Solids, liquids and gases are called the three states of matter. 5. Correct option: (A) Solids are rigid having definite shape and volume 6. Correct option: (C) Because of very loosely packing and more intermolecular space gases have more compressibility. 7. Correct option: (A) In three states of matter, gases have neither definite shape nor definite volume. 8. Correct option: (B) The packing of molecules in liquids are loosely packing because of more intermolecular space. 9. Correct option: (A) A) Solids have definite volume and shape. B) Liquids have definite volume and indefinite shape. C) Intermolecular force of attraction in solids is high. 10. Correct option: (B) The liquid state of matter has definite volume and no definite shape. 11. Correct option: (A) Iodine exists as solid, Bromine exists as liquid and fluorine exists as gas. 12. Correct option: (A) As the molecules in solids are closely packed, solids cannot be compressed. 13. Correct option: (C) Gas has the property of flowing in all directions. Because of that we smell the fragrance of Perfumes, flowers etc. 14. Correct option: (C) Because of closely in solids compared to liquids and gases, they have maximum inter molecular force of attraction.
Class 7 – Chemistry | A-7 States of Matter 2 15. Correct option: (C) Because of very very loose packing of gases and more intermolecular space gases have less intermolecular force of attraction. 16. Correct option: (C) Gases have more intermolecular space because of very loose packing. 17. Correct option: (C) The molecules in gases are very loosely packed. 18. Correct option: (A) The molecules in solids are closely packed. 19. Correct option: (D) Iron bar has the maximum intermolecular force of attraction, because iron bar exist in solid state where as the remaining substances exist in liquid and gases state which have less inter molecular force of attraction compared to solid state substances. 20. Correct option: (D) Both temperature and pressure are the main factors effecting the inter conversion of the states of matter. 21. Correct option: (B) The gas has negligible intermolecular force of attraction because of very loose packing of molecules. 22. Correct option: (D) A) Liquids do not have definite shape, it takes the shape of the container. B) Liquids have definite volume, the volume remains constant. C) Liquids are not highly compressible but more compressible than solids D) Liquids have weak intermolecular force of attraction because of loose packing of molecules. 23. Correct option: (B) With increase in temperature the state of matter will also changes. At room temperature it exists as liquid, above 100oC exist in vapour state and below 0oC exist as solid state. 24. Correct option: (A) The molecules in solid state are closely packed, they cannot move freely. So, collisions are less in solid state. 25. Correct option: (C) Gas state of matter shows diffusion property because of very loose packing of these molecules they can move freely from one place to another place. 26. Correct option: (C) Gas state of matter does not settle at the bottom of the container because of diffusion property. 27. Correct option: (D) Because of high temperature the matter exist as plasma in sun and core of stores.