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🔷1: ‘Isotonic solution’ refers to those two solutions which have- Same Osmotic pressure 🔶2. Name the metal which is generally mixed with gold while making the ornaments - Copper 🔷3. Which law states that at a constant temperature, the volume of a definite mass of a gas is inversely proportional to pressure - Boyle’s Law 🔶4. Gamma rays were discovered by - Paul Villard 🔶5. J J Thomson is credited with the discovery of - Electrons 🔷6. Which equation explains the dual nature of electron - De-Broglie Equation 🔶7. The watermelon model was given by - Thomson’s model 🔷8. Charle’s Law describes the relation between - Volume and Temperature 👉👉** Charles' law describes the relationship between temperature and volume at a constant pressure. Increasing the temperature of a volume of gas causes individual gas molecules to move faster. 🔶9. Who out classified the elements into metals and non-metals - Lavoisier ☂️10. NaCl is formed by which bond - Ionic or electrovalent bond ☂️11. Hair cream, milk are the examples of - Emulsion ☂️12. Zeman’s effect is related with - Atomic Spectra ☂️13. Which bond is formed by the complete transfer of one or more electrons from one atom to another atom - Ionic Bond ☂️14. What is the number of periods in the modern periodic table? - 7 periods ☂️15. The atomic number of an element is the number of - Electrons or protons ☂️16. Proton/Neutron/Electron which of the following has the greatest mass? - Neutron ☂️17. The hardest substance available on earth is ____- Diamond The hardness of a diamond is due to the structure of its carbon atoms. In diamond, each carbon atom is bonded to four other carbon atoms which form giant, threedimensional structure. 🔰18. Rutherford’s scattering experiment proved the presence of - Nucleus in atoms 🔰19. The molecular weight of a substance can be calculated by measuring - Vapour Density 🔰20. The chemical behaviour of an atom is determined by its - Atomic number because that indicates the number of electrons 🔰21. Isotopes and Allotropes have the same chemical properties 🔰22. Rusting of iron is a - Chemical Change A chemical change is a change of materials into other, new materials with different properties and one or more new substances are formed. E.g. Iron Rust 🔰23. An exothermic reaction is one which is - Accompanied by liberation of heat 🔰24. Pencil “lead” is made up of - Graphite 🔰25. What is the Molar mass of Benzene? - 78.11 g·mol−1 🔰26. What is the atomic number of Iron? - 26 🔶27. Cathode rays can be deflected by – Both magnetic and electric fields 👉👉J. J. Thomson showed that cathode rays were composed of a previously unknown negatively charged particle, which was later named the electron. Cathode ray tubes (CRTs) use a focused beam of electrons deflected by electric or magnetic fields to create the image on a television screen. 🔷28. Which was first human-made plastic - Celluloid 🔶29. When a piece of quicklime is dipped in water, it gives bubbles. This bubbling is due to - the escape of water vapours 🔷30. What is the number of synthetic elements in Periodic Table - 20 Elements 👉👉**Chemical element that does not occur naturally on Earth, and can only be created artificially. So far, 20 synthetic elements have been created (those with atomic numbers 99–118). #IMPORTANT_FOR_COMING_EXAMS🤞🤞

☂️☂️Phylum Examples☂️☂️ 👉Porifera Sea sponge, Glass sponge 👉Cnidaria Jellyfish, Sea anemone, Coral 👉Platyhelminthes Planaria, Tapeworm 👉Nematoda Ascaris, Hookworm 👉Annelida Earthworm, Leech 👉Mollusca Snail, Clam, Octopus 👉Arthropoda Insects (e.g., Ant, Butterfly), Arachnids (e.g., Spider, Scorpion), Crustaceans (e.g., Crab, Lobster) 👉Echinodermata Starfish, Sea urchin, Sea cucumber 👉Chordata Fish, Amphibians (e.g., Frog, Salamander), Reptiles (e.g., Snake, Lizard), Birds (e.g., Eagle, Penguin), Mammals (e.g., Human, Lion)