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11th Chemistry Monthly Test - 4 ( Quantum Mechanical Model of Atom )

MABS Institution

11th Chemistry Monthly Test - 4 ( Quantum Mechanical Model of Atom )-Aug 2020

Time : 2.00 Hours

Part - A

Generic 5 - Answer All Question

Complete the table given below

S.No Symbol Mass No. Atomic No Proton Neutron Electrons

1. Zn²⁺ 64 30 - - -

2. Cl^- 35 - - 18 18

3. Ar - - 18 22 1

A beam of helium atoms moves with a velocity of 2.0 \(\times\) 10³ ms^-1 .Find the wavelength of the particles constituting the beam (h=6.626\(\times\)10^-34 Js)

Calculate the uncertainty in the velocity of a wagon of mass 3000kg whose position is known to an accuracy of ±10 pm.(Planck's constant = 6.626 x 10^-34 kg m² S^-1)

How does the effective nuclear charge influence the stability of the orbital?

Write a note on limitations of Bohr's atom model.

A neutral atom of an element has 2K, 8L and 5M electrons. Find out the following.
(i) Atomic number of the element (ii) Total number of s-electrons (iii) Total number of p-electrons (iv) Number of protons in the nucleus (v) Valency of the element

Identify the missing quantum numbers and the sub energy level

n 1 m Sub energy level

? ? 0 4d

3 1 0 ?

? ? ? 5p

? ? -2 3d

Define the following terms with examples.
(i) Isotopes (ii) Isotones (iii) Isobars (iv) Isoelectronic species (v) Nucleon

Suppose that the uncertainty in determining the position of an electron in an orbit is 0.6 \(\mathring{A}\) . What is the uncertainty in its momentum

Calculate the uncertainty in position of a dust particle of mass 0.1 mg if the uncertainty in velocity is \(5\times { 10 }^{ -19 }{ ms }^{ -1 }\)

The uncertainty in the position and velocity of a particle are 1 nm and 5.27 X 10^-24
ms^-1 respectively. Calculate the mass of the particle.

Calculate the product of the uncertainties of displacement and velocity of a moving electron having a mass of 9.1 X 10^-28 g

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