Download App

The d & f Block Elements — Chemistry STD 12 Science — Question

Bihar BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements3 Marks
Question
How do the oxides of transition elements in lower oxidation states differ from those in higher oxidation state in the nature of metal-oxygen bonding and why?
✓

Answer

In the lower oxidation state the transition metal oxides are basic and they are acidic if the metal is in higher oxidation state. The oxides are amphoteric when the metal is in intermediate oxidation state. For example.
+3 +4 +7
Mn2O3 MnO2 Mn2O7
Basic Amphoteric Acidic

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "3 Marks Question" from The d & f Block Elements→The d & f Block Elements — all question types→Chemistry STD 12 Science question papers→Bihar Board STD 12 Science question papers→Bihar Board question paper generator→

Similar questions

Account for the following observations:
  1. pKb for aniline is more than that for methylamine.
  2. Methylamine solution in water reacts with ferric chloride solution to give a precipitate of ferric hydroxide.
  3. Aniline does not undergo Friedel-Crafts reaction.
→
Explain chemical properties of $KMnO _4$
→
Explain the following in one or two sentences:
Allyl chloride is hydrolysed more readily than n-propyl chloride.
→
Explain magnetic properties of transition element.
→
What is meant by chelate effect?
→
How will you convert the following:
(i) Impure Nickel to pure Nickel
(ii) Zinc blende to Zinc metal
(iii) $\left[ Ag ( CN )_2\right]^{-}$to Ag
→
How much charge is required for the following reductions:
i. 1 mol of $Al ^{3+}$ to Al ?
ii. 1 mol of $Cu ^{2+}$ to Cu ?
iii. 1 mol of $MnO _4^{-}$to $Mn ^{2+}$ ?
→
How would you bring about the following conversions?
i. Propanal to butanone
ii. Benzaldehyde to benzophenone
iii. Benzoyl chloride to benzonitrile
→
An organic compound (A) (molecular formula C8H1602) was hydrolysed with dilute sulphuric acid to give a carboxylic acid (B) and an alcohol (C). Oxidation of (C) with chromic acid produced (B). (C) on dehydration gives but-1-ene. Write equations for the reactions involved.
→
What is cell potential and emf? Explain representation of galvanic cell with examples?
→