MnO is basic whereas Mn_2O_7 is acidic in nature. Give reason. - Vidyadip

Question

$MnO$ is basic whereas $Mn_2O_7$ is acidic in nature. Give reason.

✓

Answer

When a metal is in a high oxidation state, its oxide is acidic and when a metal is in a low oxidation state its oxide is basic.

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 "4 Marks Questions" from MODEL PAPER 2→MODEL PAPER 2 — all question types→Chemistry STD 12 Science question papers→Rajasthan Board STD 12 Science question papers→Rajasthan Board question paper generator→

Similar questions

Write down the electronic configuration of :
(i) Cr³⁺ (ii) Pm³⁺ (iii) Cu⁺ (iv) Ce⁴⁺ (v) Co²⁺ (vi) Lu²⁺ (vii) Mn²⁺ (viii) Th⁴⁺

Give examples and suggest reasons for the following features of the transition metal chemistry :
(i) The lowest oxide of transition metal is basic, the highest is amphoteric/acidic.
(ii) A transition metal exhibits highest oxidation state in oxides and fluorides.
(iii) The highest oxidation state is exhibited in oxoanions of a metal.

Illustrate with examples the limitations of Williamson synthesis for the preparation of certain types of ethers.

What happens when primary, secondary and tertiary alcohols are:
(i) Oxidised using acidified potassium permanganate.
(ii) Passed over heated copper at 570 K.

The mole fraction of helium in a saturated solution at $20^\circ C$ is $1.2 g 10-6$ . Find the pressure of helium above the solution. Given Henry's constant at $20^\circ C$ is $144.97 k $ bar. $(2)$

(i) Draw the structures of all isomeric alcohols of molecular formula $C _5 H _{12} O$ and give their IUPAC names.
(ii) Classify the isomers of alcohols in question 7.3. (i) as primary, secondary and tertiary alcohols.

Explain with equations, the nucleophilic addition reaction of aldehydes and ketones with Grignard's reagent (R'-Mg-X).

Give reason :
$(i)$ The boiling point of ethanol is higher than that of hydroxymethane.
$(ii)$ Phenol is a stronger acid than alcohol.
$(iii)$ Ethanol easily dissolve in water.

The d-block of the periodic table contains the elements of the groups 3 to 12 and are known as transition elements. In general, the electronic configuration of these elements is $(n-1) d^{1-10} n s^{1-2}$. The d-orbitals of the penultimate energy level in their atoms receive electrons giving rise to the three rows of the transition metals i.e. 3d, 4d and 5d series. However, $Zn , Cd$ and Hg are not regarded as transition elements. Transition elements exhibit certain characteristic properties like variable oxidation stables, complex formation, formation of coloured ions, alloys, catalytic activity etc. Transition metals are hard (except $Zn , Cd$ and Hg ) and have a high melting point.
i. Why are $Zn , Cd$ and Hg non-transition elements?
ii. Which transition metal of 3d series does not show variable oxidation state?
iii. Why do transition metals and their compounds show catalytic activity?
OR
iii. Why are melting points of transition metals high?

Explain the following:
(i) Electrophilic chlorination (substitution) of toluene.
(ii) Free radical halogenation of alkanes.