Structure of Atom: Chemistry Free Online Mock Test 1

Cathode rays are deflected by

In a sodium atom (atomic number = 11 and mass number = 23) and the number of neutrons is

The Balmer series in the spectrum of hydrogen atom falls in

The idea of stationary orbits was first given by

de Broglie equation is

The orbital with n = 3 and l = 2 is 

The outermost electronic configuration of manganese (at. no. = 25) is

The energy needed to remove a single electron (most loosely bound) from an isolated – gaseous atom is called

The maximum number of electrons in a sub-shell is given by the equation

(a) n² (b) 2n² (c) 2l – 1 (d) 2l + 1

If the value of azimuthal quantum number is 2, what will be the values for magnetic quantum number?

What is the minimum product of uncertainty in the position and momentum of an electron?

Which orbital is non-directional?

How many electrons in an atom can have n + l = 6?

An ion A³⁺ has 18 electrons. What is the atomic number of A?

Arrange the electron (e), proton (p) and alpha particle (α) in the increasing order of charge/mass ratio (e/m).

In a hydrogen atom, the energy of an electron in first Bohr’s orbit is 13.12 × 10⁵ J mol⁻¹. What is the energy required for its excitation to Bohr’s second orbit?

A. 3.28 × 10⁵ J mol⁻¹
B. 6.56 × 10⁵ J mol⁻¹
C. 9.84 × 10⁵ J mol⁻¹
D. 13.12 × 10⁵ J mol⁻¹

With what velocity must an electron move so that its momentum is equal to that of a photon of wavelength 5200 Å?

A. 1.0 × 10⁵ m s⁻¹
B. 1.4 × 10⁵ m s⁻¹
C. 2.8 × 10⁵ m s⁻¹
D. 4.2 × 10⁵ m s⁻¹

The uncertainty in the position of a moving bullet of mass 10 g is 10⁻⁵ m. Calculate the uncertainty in its velocity.

A. 5.3 × 10⁻²⁸ m s⁻¹
B. 5.3 × 10⁻²⁷ m s⁻¹
C. 5.3 × 10⁻³⁰ m s⁻¹
D. 5.3 × 10⁻²⁵ m s⁻¹

When is the energy of an electron regarded as zero?