HSC Science (Electronics) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions

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?

Why do actinoids show variable oxidation states?

What are actinoids? Give their general electronic configuration.

Choose the most correct option.

Which actinoid, other than uranium, occur in a significant amount naturally?

Write any two properties of actinides.

Write any two uses of actinides.

Write two applications of actinoids.

The atomic number of transuranium elements starts from _______.

Define transuranium.

Write a note on postactinoid elements.

What are post actinoid elements?

Write the atomic numbers of transuranium elements.

Statements that are incorrect in relation to index numbers:

1. An index number is a geographical tool.
2. Index numbers measure changes in air pressure.
3. Index numbers measure relative changes in an economic variable.
4. Index numbers are specialized averages.