Question

M. Marks : 25
Time: 1 Hr
Date : 18.07.2018
2M
1. Write the significance of Heisenberg's uncertainity principle.
IM
2. How much energy is required to ionise a H atom if the electron occupies n = 5 orbit?
3. Write any two drawbacks of Bohr's theory.
IM
IM
4. Why half filled and fulfilled orbitals are more stable than other orbitals.
5. Find (a) the total number and (b) the total mass of neutrons in 7 mg of 'C.
2M
6 An ion with mass number 56 contains 3 units of positive charge and 30.4% more neutrons than electrons.
Assign the symbol to this ion.
2M
7. A student has written the electronic configuration of carbon as Is? 2s 2p 2pº2p. Which principle is
violated by the student and state the rule.
2M
89 Calculate the wavelength of 1000 kg rocket moving with a velocity 300 km per hour? 3M
Write the electronic configuration of the following:
(a) X ( atomic number = 29)
(b) Y+ (atomic number is 82)
3M
(c), Z-2 (atomic number is 58)
10. Calculate the amount of energy required to excite the electron from 2nd excited state to the 3rd excited state
of unipositive Helium ion. Also calculate the wavelength of light when the excited electron returns back to
3M
the ground state.
11. (a) Draw the shapes of d-orbitals.
(b) An electron in a hydrogen atom in the ground state absorbs energy equal to 1.5 times the minimum
the wavelength of the electron
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Answer 1

Answer:

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