Science (English Medium) Class 12 - CBSE Question Bank Solutions

Name the oxometal anions of the first series of the transition metals in which the metal exhibits the oxidation state equal to its group number.

Describe the preparation of potassium dichromate from iron chromite ore. What is the effect of increasing pH on a solution of potassium dichromate?

Describe the preparation of potassium dichromate from iron chromite ore. What is the effect of increasing pH on a solution of potassium dichromate?

Describe the preparation of potassium permanganate. How does the acidified permanganate solution react with iron (II) ions? Write the ionic equation for the reaction.

Give an example and suggest a reason for the following feature of the transition metal chemistry:

The lowest oxide of transition metal is basic, the highest is amphoteric/acidic.

Give an example and suggest a reason for the following feature of the transition metal chemistry:

A transition metal exhibits the highest oxidation state in oxides and fluorides.

Give an example and suggest a reason for the following feature of the transition metal chemistry:

 The highest oxidation state is exhibited in oxoanions of a metal.

Indicate the steps in the preparation of K₂Cr₂O₇ from chromite ore.

Indicate the steps in the preparation of KMnO₄ from pyrolusite ore.

Write the formula for the given coordination compound:

Tetraamminediaquacobalt (III) chloride

Write the formula for the given coordination compound:

Potassium tetracyanidonickelate (II)

Write the formula for the given coordination compound:

Tris(ethane−1, 2−diamine) chromium (III) chloride

Write the formula for the given coordination compound:

Amminebromidochloridonitrito-N-platinate (II)

Write the formula for the given coordination compound:

Dichloridobis(ethane−1, 2−diamine)platinum (IV) nitrate

Using IUPAC norms, write the formula for the following:

Tetrahydroxidozincate(II)

Using IUPAC norms, write the formula for the following:

Potassium tetrachloridopalladate(II)

Using IUPAC norms write the formula for the following:

Diamminedichloridoplatinum(II)

Using IUPAC norms, write the formula for the following: 

Hexaamminecobalt (III) sulphate

Using IUPAC norms, write the formula for the following:

Potassium tri(oxalato)chromate(III)

Using IUPAC norms, write the formula for the following:

Tetrabromidocuprate(II)