D. Match the following: Column A Column B 1. Maharishi Kanad. (a) Atom
2. Lavoisier (b) Atomic theory
3. Dalton (c) Identical atoms
4. Elements (d) Parmanu
5. Democritus (e) Law of constant proportions.
Answers
A→3,B→4,C→1,D→2,E→6,F→7,G→5
1. Rutherford did the scattering experiment and observed that some of the rays bounce back. He concluded that there is a mass in which positive charge is concentrated. This marks the discovery of nucleus.
2. J.J Thomson discovered electrons by conducting cathode ray experiment.
3. Dalton postulated that matter is made up of small particles caled atoms
4. Neils bohr postulated that electrons revolve around the nucleus in fixed orbits.
5. James Chadwick discovered neutrons which has no charge.
6. E Goldstein discovered protons by conducting canal rays experiment.
7. Moseley did x ray experiment and concluded that the chemical properties are a periodic function of their atomic number.
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Answer:
1 - (d)
2- (e)
3 - (b)
4- (c)
5 - (a)
Explanation:
kindly note that in the 2nd part the law of constant proportions was given by Joseph Proust but because of match the column we considered most appropriate one ( lavoisier who gave the law of conservation of mass)