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Q. No.
Which of the following is correct match for hydrogen like species for the total energy of \(e^-\)?
Species and Orbit Energy (J/atom)
1. \(3^{rd}\) orbit of \(Li^{2+}\) ion \( -21.6 \times 10^{-19} \)
2. \(2^{nd}\) orbit of \(He^{+}\) ion \( -10.8 \times 10^{-19}\)
3. \(2^{nd}\) orbit of \(Li^{2+}\) ion \( -9.6 \times 10^{-19} \)
4. \(2^{nd}\) orbit of H-atom \( -86.4 \times 10^{-19} \)
Subtopic:  Introduction of Atomic Structure | Hydrogen Spectra |
 71%
Level 2: 60%+
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Electrons are emitted in a cathode ray tube with a velocity of 1000 m/s. Select the correct statement among the following is: 
1. The de Broglie wavelength of an electron is 666.67 nm.
2. The cathode rays travel from the cathode to the anode.
3. The characteristics of electrons depend on the metal used in the cathode.
4. The characteristics of electrons depend on the gas filled inside the cathode tube.
Subtopic:  Introduction of Atomic Structure | De Broglie Equation |
 74%
Level 2: 60%+
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Given below are two statements:
Statement I: Rutherford’s gold foil experiment cannot explain the line spectrum of hydrogen atom.
Statement II: Bohr’s model of hydrogen atom contradicts heisenberg’s uncertainty principle.
 
1. Both Statement I and Statement II are true.
2. Statement I is false but Statement II is true.
3. Statement I is true but Statement II is false.
4. Both Statement I and Statement II are false.
Subtopic:  Introduction of Atomic Structure |
 84%
Level 1: 80%+
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Which of the following statements was not proposed by Dalton?

1. Chemical reactions involve the reorganization of atoms. These are neither created nor destroyed in a chemical reaction.
2. Matter consists of indivisible atoms.
3. All the atoms of a given element have identical properties, including identical mass. Atoms of different elements differ in mass.
4. When gases combine or react in a chemical reaction, they do so in a simple ratio by volume, provided all gases are at the same T & P.
Subtopic:  Introduction of Atomic Structure |
 87%
Level 1: 80%+
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