Question 31 : Mean distance between atoms in the range of
1. 25 nm
2. 2.5 nm
3. 0.28nm
4. 0.025 nm
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Question 32 : Particles that most effects material properties
1. Neutrons
2. Electrons
3. Protons
4. Valence electrons
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Question 33 : Which one of the following is not a strong bond?
1. Metallic bond
2. Ionic bond
3. Covalent bond
4. van der Waals bond
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Question 34 : An element has 18 electrons, and 20 .neutrons. Its charge is –2. What is its mass number?
1. 38
2. 39
3. 32
4. 40
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Question 35 : The value of magnetic quantum number of the last electron of Na is?
1. 0
2. 2
3. 1
4. 3
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Question 36 : Neutrons were discovered by?
1. J.J. Thomson
2. Faraday
3. Dalton
4. Chadwick
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Question 37 : Atomic mass of an element is equal to the sum of?
1. Electron and proton
2. None of the above
3. Proton and neutron
4. Electron and neutron
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Question 38 : The maximum number of. electrons that can be accommodated by p — orbital is?
1. 6
2. 14
3. 2
4. 10
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Question 39 : Electromagnetic radiations produced from nuclear reactions are?
1. γ - rays
2. x — rays
3. β - rays
4. α - rays
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Question 40 : Neutron is a fundamental particle which carries?
1. No charge and mass of one unit
2. A charge of +1 and mass of l unit
3. A charge —1 unit and no mass.
4. No charge and no mass.
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