HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions

The following electronic configuration of elements shows highest oxidation state

Name the radioactive element in lanthanoids.

Give the electronic configuration of europium (Z = 63).

Explain the trend in an Oxidation state of 3d elements.

Give the properties of Lanthanoids.

Give the electronic configuration of gadolinium (Z = 64).

Write expected and observed electron configurations of ₅₈Ce.

Eu (Z = 63) and Yb (Z = 70) show + 2 oxidation state. Explain.

What are the physical properties of lanthanoids?

Write two uses of lanthanoids.

Define actinoid contraction.

State Third law of thermodynamics. Give ‘two’ uses.

No machine has an efficiency unity', is stated in-

(a) first law of thermodynamics

(b) second law of thermodynamics

(c) third law of thermodynamics

(d) Hess' law of constant heat summation

Give two uses of the Third law of thermodynamics.

Write two applications of lanthanoids.

Distinguish between lanthanoid and actinoids.

Write four points of distinction between Lanthanoids and Actinoids.

What is the position of actinoids in periodic table ?

Choose the most correct option.

In which of the following series all the elements are radioactive in nature?

Manganese in the +2 oxidation state is more stable than +3 oxidation state where as iron is stable at +3 oxidation state than +2 oxidation state. Explain why?