HSC Science (Electronics) इयत्ता १२ वी - Maharashtra State Board Important Questions

Write observed electronic configuration of elements from first transition series having half
filled d-orbitals.

What is the action of acidified potassium dichromate on - KI 

Baeyer’s reagent is -'

(a) acidified potassium dichromate

(b) alkaline potassium dichromate

(c) alkaline potassium permanganate

(d) acidified potassium permanganate

Write balanced chemical equations for the conversion of `CrO_4^(2-)` to `Cr_2O_7^(2-)` in acidic medium and `Cr_2O_7^(2-)` to `CrO_4^(2-)`
 in basic medium.

Oxidation states of scandium are ___________.

How is potassium dichromate prepared from chrome iron ore?

Explain the position of actinoids in the periodic table.
What is the action of sulphur on lanthanoids? Calculate the magnetic moment of divalent ion in aqueous solution it its atomic number is 24.

What are 'd' and 'f' block elements?

Why do the d-block elements form coloured compounds?

The compounds of \[\ce{Ti^4+}\] ions are colourless due to ______.

What are f-block elements? 

What are chemical twins? Write ‘two’ examples.

What are lanthanoids?

Which among the following pairs of elements is 'not' an example of chemical twins?

Write the different oxidation states of iron

Explain, why lanthanum (Z = 57) forms La³⁺ ion, while cerium (Z = 58) forms Ce⁴⁺ ion?

What are the consequences of lanthanoid contraction?

What is the position of actinoids in periodic table ?

What is the action of the following on lanthanoids?
a. water
b. Sulphur, heat
c. nitrogen, heat

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?