HSC Science Class 11 - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

The energy of an electron in the 3rd orbit of hydrogen atom is –E. The energy of an electron in the first orbit will be

Consider the following electronic arrangements for the d⁵ configuration.

1. which of these represents the ground state.
2. which configuration has the maximum exchange energy.

State and explain Pauli's exclusion principle.

Define orbital?

what are the n and l values for 3p_x and `"4d"_("x"^2 - "y"^2)` electron?

Consider the reaction where K_p = 0.5 at a particular temperature

\[\ce{PCl5(g) <=> PCl3 (g) + Cl2 (g)}\]

if the three gases are mixed in a container so that the partial pressure of each gas is initially 1 atm, then which one of the following is true.

Calculate the uncertainty in position of an electron, if Δv = 0.1% and υ = 2.2 × 10⁶ ms^-1

Determine the values of all the four quantum numbers of the 8^th electron in the O-atom and 15^th electron in Cl atom.

For each of the following, give the sub level designation, the allowable m values and the number of orbitals

1. n = 4, l = 2
2. n = 5, l = 3
3. n = 7, l = 0

Give the electronic configuration of Mn²⁺ and Cr³⁺

Describe the Aufbau principle.

An atom of an element contains 35 electrons and 45 neutrons. Deduce

1. the number of protons
2. the electronic configuration for the element
3. All the four quantum numbers for the last electron

Calculate the energy required for the process.

\[\ce{He^+_{(g)} -> He^2+_{(g)} + e^-}\]

The ionisation energy for the H atom in its ground state is −13.6 ev atom⁻¹.

An ion with mass number 37 possesses unit negative charge. If the ion contains 11.1% more neutrons than electrons. Find the symbol of the ion.

Identify the missing quantum numbers and the sub energy level

The group of elements in which the differentiating electron enters the anti penultimate shell of atoms are called ________.

Which of the following elements will have the highest electronegativity?

Various successive ionisation enthalpies (in kJ mol^-1) of an element are given below.

The element is

In the third period the first ionization potential is of the order.

Identify the wrong statement.