Which of the following statement is incorrect about the structure of an atom? i. The whole mass os an atom is concentrated in the nucleus. ii.The atom is an indivisible particle .iii.The atoms as a whole is neutral iv.All the atom are stable in their basic state. *
Answers
Answer:
all the atom is stable in their basic state
Answer:
1. Who discovered the electron?
(a) Rutherford
(b) Chadwick
(c) Thomson
(d) Goldstein
Answer. (c) Thomson
2. Which isotope is used in the nuclear power plants to generate electricity?
(a) Uranium 235
(b) Iodine 131
(c) Cobalt 60
(d) Uranium 238
Answer. (a) Uranium 235
3. Why was the Thomson’s Model of an atom failed?
i. It could not explain the screening of negative charges from that of positive
ii. It did not tell about the presence of electrons
iii. It did not give an idea about the discrete energy levels
iv. It explained the atom as a whole to be electrically neutral
Choose the correct option from the following:
(a) Only (iii)
(b) Both (i) & (iii)
(c) Only (i)
(d) Both (ii) & (iv)
Answer. (b) Both (i) & (iii)
4. What was the source of alpha particles in Rutherford scattering experiment?
(a) Hydrogen nucleus
(b) Argon nucleus
(c) Helium nucleus
(d) None of these
Answer. (c) Helium nucleus
5. What property of an element determines its chemical behaviour?
(a) Size of an element
(b) Valency of an element
(c) Molar mass of the element
(d) None of these
Answer. (b) Valency of an element
6. Which of the following does not match the characteristics of an Isotope?
(a) Isotopes of some elements are radioactive
(b) Isotopes are the atoms of different elements
(c) Isotopes differ in number of neutrons
(d) Isotopes have similar chemical properties
Answer. (b) Isotopes are the atoms of different elements
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