In this post, you will find FSC 1st Year Chemistry Chapter 5 Short Questions with Answers Notes PDF for Class 11 students. Atomic Structure is the 5th Chapter in Chemistry 1st Year Book. If you are a student of FSC part 1 and looking for 1st Year Chemistry Chapter 5 Atomic Structure Short Questions with Answers then continue to this post. In this post, I will share quality notes of this chapter. You can read these notes online and also can download them as pdf.
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11th Class Chemistry Chapter 5 Atomic Structure Short Questions with Answers for FSC Part 1
Chemistry Class 11 Chapter 5 Short Questions and Answers
By pressing the Download PDF Now, you can download the 40 Short Questions with Answers of Class 11 Chemistry Chapter 5. However, some of them I am sharing below.
Q. Why is it necessary to decrease the pressure in the discharge tube to get the cathode rays?
Ans. It is observed that current does not flow through the gas at ordinary pressure even at a high voltage of 5000 volts due to the crowdedness of gas molecules. When pressure is reduced to 0.01 torr, the number of molecules decreases and empty spaces are produced. Therefore electrons (cathode rays) can easily pass through these empty spaces and move towards the anode.
Q. How does the bending of cathode rays in the electric and magnetic fields show that they are negatively charged?
Ans. In 1985 J.Perrin observed that cathode rays are deflected in a magnetic field, perpendicular to the line joining the north and south pole. This show that cathode rays are charged particles. In 1897, J.J Thomson passed the cathode rays through an electric field. The cathode rays deflected towards the positive end indicating that cathode rays are negatively charged.
Q. What is Zeeman Effect?
Ans. When excited atoms of hydrogen (which give an emission line spectrum are placed in an external magnetic field, its spectral lines are further split up into closely spaced lines. “This type of splitting of spectral lines in the magnetic field is called the “Zeeman Effect”.
Q. What is the stark effect?
Ans. When excited atoms of hydrogen (which give emission line spectrum) are placed in an external electrical field, its spectral lines slit up into closely spaced lines. Such type of splitting of spectral lines in the electrical field is called as “Stark Effect”.
Q. How the wave nature of the electrons is verified?
Ans. In 1927, two American Scientists, Davisson and Germer did an experiment to verify the wave nature of moving electrons. Electrons were produced from heated tungsten filament and accelerated by applying the potential difference through charged plates. Davisson and Germer proved that the accelerated electrons undergo diffraction, like waves, when they fall on a nickel crystal. In this way, the wave nature of the electron got verified. Davisson and Germer got the Nobel prize for inventing an apparatus to prove the matter waves and be Broglie got the separate Nobel prize for giving the equation of matter-wave.
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