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Consider the following statements about early ideas on atoms and chemical combination:
1. Experiments on the law of conservation of mass are associated with Lavoisier.
2. The law of definite proportions is associated with the work of John Dalton.
3. Dalton's atomic theory holds that the atoms of an element are alike.
Which of the statements given above is/are correct?
Arrange the following ideas about the atom in the order in which they came:
1. Bohr places electrons in shells K, L, M, N
2. Maharishi Kanad names the smallest particle Parmanu
3. Rutherford's alpha-particle scattering reveals the nucleus
4. Thomson describes the atom as a positive sphere with electrons
Select the correct chronological order.
Consider the following statements about sub-atomic particles:
1. The mass of an electron is about 1/2000 of the mass of a hydrogen atom.
2. The neutron carries a positive charge.
Which of the statements given above is/are correct?
Consider the following statements about models of the atom:
1. In Bohr's model, electrons occupy shells of fixed energy.
2. The N shell can hold a maximum of 32 electrons.
3. Rutherford's model successfully explained the stability of the atom.
Which of the statements given above is/are correct?
Consider the following statements:
1. Chlorine-35 and chlorine-37 have the same atomic number.
2. Calcium and argon, both with mass number 40, are isotopes of each other.
Which of the statements given above is/are correct?
Match List-I with List-II:
| List-I (Term) | List-II (Meaning) |
|---|---|
| A. Atomic number | 1. About \(6.022 \times 10^{23}\) particles in one mole |
| B. Mass number | 2. Number of protons |
| C. Atomic mass unit | 3. 1/12 of the mass of a carbon-12 atom |
| D. Avogadro number | 4. Protons plus neutrons |
Select the correct answer using the codes given below.
Consider the following statements about early ideas of the atom:
1. Maharishi Kanad called the smallest particle, which could not be broken further, Parmanu.
2. Thomson pictured the atom as a positive sphere with electrons embedded in it, like seeds in a watermelon.
3. Thomson's model placed a tiny nucleus at the centre of the atom.
Which of the statements given above is/are correct?
Match List-I with List-II:
| List-I (Observation/Expression) | List-II (Associated idea) |
|---|---|
| A. Canal rays | 1. Atomic mass unit |
| B. Alpha-particle scattering | 2. Discovery of the proton |
| C. 2n squared | 3. Maximum electrons in a shell |
| D. One-twelfth of the mass of a carbon-12 atom | 4. Tiny nucleus in the atom |
Select the correct answer using the codes given below.
Consider the following statements about uses of isotopes:
1. An isotope of iodine is used in the treatment of goitre.
2. An isotope of cobalt is used as fuel in nuclear reactors.
3. An isotope of uranium is used in the treatment of cancer.
Which of the statements given above is/are correct?
Using the 2n squared rule, what is the total maximum number of electrons that the K, L and M shells can hold together?
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