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451.

Which one of the following configurations is correct for iron?
(a)1s2, 2s22p6, 3s23p63d5
(b)1s2, 2s22p6, 3s23p6, 4s23d5
(c)1s2, 2s22p6, 3s23p6, 4s23d7
(d)1s2, 2s22p6, 3s23p6, 4s23d6
Comment
Answer is: D

452.

Consider the following pairs of ions of atoms
1. Na+ and Ne
2. Na+ and K+
3. K+ and Cl-
In which of these pair are the ions/atoms isoelectronic with each other?
(a)1, 2 and 3
(b)1 and 2
(c)2 and 3
(d)1 and 3
Comment
Answer is: D

453.

The number of water molecules differing in molecular mass formed by hydrogen isotopes 1H, 2H, 2H and oxygen isotopes 16O, 17O, 18O is
(a)6
(b)9
(c)12
(d)18
Comment
Answer is: A

454.

Which of the following statements with regard to isotopes and isobars is/are correct?
1. Isotopes have same mass number.
2. Isobars have same atomic number.
Select the correct answer using the codes given below.
(a)Only 1
(b)Only 2
(c)Both 1 and 2
(d)Neither 1 nor 2
Comment
Answer is: D

455.

Which of the following statement is not true for the dipositive zinc ions having mass number 70?
(a)It contains 40 neutrons
(b)It contains 28 electrons
(c)It contains 30 protons
(d)It isotopic number is same as that of 24Cr55
Comment
Answer is: D

456.

Consider the following statements
1. An atom consists of a positively charged sphere and the electrons are embedded in it.
2. The negative and positive charges are equal in magnitude. So, the atom as a whole in electrically neutral.
Which of the statements given above is/are correct about Thomson's model of an atom?
(a)Only 1
(b)Only 2
(c)Both 1 and 2
(d)Neither 1 nor 2
Comment
Answer is: C

457.

Rutherford's model of atom is considered unsuitable because
(a)A positively charged nucleus remain separated from negatively charged electrons
(b)An accelerated electron would continuously lose energy in the form of radiation
(c)Nuclear mass is not sufficiently heavy to keep the light electron in its orbit.
(d)The centre of gravity of the system would be with in the volume of the nucleus.
Comment
Answer is: B

458.

Consider the following statements
1. JJ Thomson was the first one to propose a mode for the structure of an atom.
2. Rutherford disigned an experiment for the arrangement of electrons with in an atom. In this experiment, fast moving alpha particle were made do fall on a thin gold foil.
Which of the statement given above is/are correct?
(a)Only 1
(b)Only 2
(c)Both 1 and 2
(d)None of the above
Comment
Answer is: C

459.

Which of the following statements does not form a part of Bohr's model of hydrogen atom?
(a)Energy of the electrons in the orbit is quantised
(b)The electron is the orbit nearest the nucleus has the lowest energy
(c)Electrons revolve in different orbits around the nucleus
(d)The position and velocity of the electrons in the orbital cannot be determined simultaneously
Comment
Answer is: D

460.

Which one among the following transitions of electron of hydrogen atom emits radiation of the shortest wavelength?
(a)N = 2 to n = 1
(b)N = 3 to n = 2
(c)N = 4 to n = 3
(d)N = 5 to n = 4
Comment
Answer is: A

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