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D F Block NCERT > Transition element compounds > Flashcards

Transition element compounds Flashcards

1
Q

All D block elements except __ form MO oxides

A

Scandium

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2
Q

Vanadium 5 is stabilised as
Vanadium 4 is stabilised as
Titanium 4 is stabilised as

A

VO2 +
VO (2+)
TiO (2+)

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3
Q

Mn2O7 is a

A

covalent explosive green oil

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4
Q

CrO3 and V2O5

A

High oxidation states, highly covalent, low melting points

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5
Q

Mn2O7 + water

A

HMnO4

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6
Q

CrO3 + water

A

H2CrO4 and H2Cr2O7

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7
Q

V2O5 is

A

amphoteric but mainly acidic and gives VO4 (3-) as well as VO2 (+) salts

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8
Q

CrO

A

Basi

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9
Q

Cr2O3

A

amphoteric

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10
Q

Potassium dichromate (K2Cr2O7) is a very important chemical used in

A

leather industry
Oxidant for preparing azo compounds

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11
Q

which is more soluble Na2CrO7 vs K2Cr2O7

A

Na2Cr2O7 is more soluble

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12
Q

Colour of sodium chromate

A

Yellow

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13
Q

Colour of sodium dichromate Na2Cr2O7. 2H2O

A

Orange

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14
Q

Colour of potassium dichromate

A

Orange

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15
Q

Dichromate structure

A

Consists of 2 tetrahedra sharing one corner with Cr-O-Cr bond of 126 degrees

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16
Q

Potassium dichromate is used as

A

Primary standard in volumetric analysis

17
Q

Magnetic behaviour of potassium permanganat

A

Diamagnetic but temperature dependent paramagnetism
explained by molecular orbital theory

18
Q

Green manganate has __ number of unpaired electrons

A

1

19
Q

Assertion: Permanganate Mn+7 at H+ = 1 should oxidise water but is not feasible

A

Reason: Kinetics of the reaction are very slow unless either Mn2+ ions are present or temperature is raised

20
Q

Oxidation of Manganous salt to MnO2 is catalysed by

A

Zinc sulphate or zinc oxide

21
Q

Potassium permangante uses

A

Oxidant in organic preparative chemistry
bleaching wool cotton silk etc
decolourisation of oils

22
Q

3d elements which are practically passive todilute non oxidising acids at room temperature

A

Titanium and vanadium

23
Q

Element with highest negative enthalpy of hydration

A

Nickel

24
Q

Strong reducing agents

A

Ti2+ V2+ Cr2+

25
Q

Abilitiy of flourine to stabilise the higest oxidation state in case of CoF3 is due to

A

higher lattice energy

26
Q

Abilitiy of flourine to stabilise the higest oxidation state in case of VF5, CrF6 is due to

A

Higher bond enthalpy for higher covalent compoundsd

27
Q

Who can reduce Cu

A

Hot concentrated sulphuric and nitric

28
Q

Opposite inert effect in d block oopsies

A
29
Q

Low oxidation state by which ligands

A

Ligands capable of pi acceptor character in addition to the sigma bonding

30
Q

Variation of I.E. across period in d blcok

A

not that steep

31
Q

Exchange energy is proportional to

A

Total number of possible pairs of parallel spins in the degenerate orbitals

32
Q

Density L to R

A

increases

33
Q

Elements with a typical metal structure oopsies waala

A

Zn, Cd, Hg, Mn

34
Q
A

D F Block NCERT (5 decks)

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