9th chemistry (ENGLISH MEDIUM NEW)

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    Welcome to your 9th chemistry (ENGLISH MEDIUM NEW)

    பெயர்
    மாவட்டம்
    மின்னஞ்சல்
    1. Which statement is not correct for a mixture?

    2. A colloidal solution is a.........

    3. Muddy water is an example of...........

    4. Which of the following will show the “Tyndall Effect”?

    5. The energy for the process of sublimation can be derived either from the surroundings or from the heat supplied.

    6. The erratic random movement of microscopic particles in a fluid, as a result of ‘ continuous bombardment from molecules of the surrounding medium was discovered by the scientist Robert Brown and so the movement is called “Brownian motion”

    7. The separation of denser particles from lighter particles done by rotation at high speed is called ………………

    8. Noble gases are placed in the _______ group in the modern periodic table.

    9. The maximum number of electrons that can be accommodated in s, p ,d, and f subshells are _________ .

    10. d-block elements are otherwise known as _________ .

    11. Which block of the periodic table contains metals, non-metals and metalloids?

    12. If the electronic configuration of an element is 1s2 2s2 2p6 3s2 3p1’then it will occupy ……………… block of the periodic table.

    13. Every eighth element had properties similar to those of the first element like the eighth note in an octave of music is similar to the first is called Newlands’ Law of Octaves.

    14. Assertion (A): Group 2 elements in the modem periodic table are called alkaline earth metals. Reason (R): The oxides of group 2 elements produce alkaline solutions when they are dissolved in water.

    15. Modern periodic law states that the physical and chemical properties of elements are the periodic functions of their ……………

    16. Sodium having atomic number 11, is ready to ______________ electron/electrons to attain the nearest noble gas electronic configuration.

    17. Which of the following atom can exist independently?

    18. Alkali and alkaline earth metals form ………… compound when they react with non-metals.

    19. Which of the following compound(s) possesses a high melting point?

    20. The element that would form cation due to the loss of electron during the chemical reaction is ………………..

    21. Fajan’s rule is formulated by considering …………… the cation and ………………..of the cation and anion.

    22. The formation of brown colour on the freshly unit surface of vegetables and fruits is because ………………. of organic compounds present in them.

    23. Which of the following compounds has melting and boiling points higher than covalent compounds but lower than ionic compounds?

    24. Atoms having 1,2 or 3 electrons in their valence shell will readily form ……………..

    25. Hydrochloric Acid reacts with metal bicarbonates to give ……………

    26. The molar ratio of hydrochloric acid and nitric acid in aquaregia is ………………..

    27. Which of the following pairs are weak base?

    28. Which of the following solutions do not conduct electricity?

    29. A salt which is formed by complete neutralization of an acid and a base is called ………………. salt.

    30. The chemical name of plaster of paris is ……………………..

    31. …………… & ………….. metals do not react with HCl or HNO3.

    32. The number of water molecules present in one molecule of copper sulphate is

    33. A phenomenon in which an element exists in different modification in same physical state is called...................

    34. Nandhini brings her lunch every day to school in a plastic container which has resin code number 5. The container is made of

    35. Plastics made of Polycarbonate (PC) and Acrylonitrile Butadiene Styrene (ABS) . are made of resin code …………………

    36. The legal measures to prevent plastic pollution come under the Protection …………….. Act 1988.

    37. The ability of carbon to form …………… is the main reason for the formation of various classes of carbon compounds.

    38. Arrangement of atoms in diamond is …………………

    39. According to the Octet rule, carbon requires ……………. electrons to attain the nearest noble gas.

    40. Which of the following plastic items are banned by the Government of Tamil Nadu as of 1st January 2019?

    41. Nanoparticles are unstable when they come in contact with ………………..

    42. Which is the incorrect statement in the following?

    43. Paracetamol is a …………….

    44. The antiseptic used for cleansing the wounds is ………………..

    45. Antimalarial drug obtained from Cinchona bark is ……………………

    46. The drug that ¡s known as “Miracle drug” is ………………….

    47. The compound that gets redUced ¡n the alcohol test is ……………………

    48. Assertion (A) : Antiseptic is a substance that prevents infections caused by disease-causing pathogens. Reason (R) : Antiseptics either kill the microorganism or prevent their growth.

    49. Assertion (A) : After eating fruits (or) vegetables, one may feel uncomfortable due to a burning sensation. Reason (R) : Burning sensation is due to an imbalance in the acidity of the stomach.

    50. Assertion (A) : Metals like iron are electroplated with chromium. Reason (R) : Electroplating is done to protect chromium from rusting.