Transition element compounds

Question 1

All D block elements except __ form MO oxides

Answer 1

Scandium

Question 2

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

Answer 2

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

Question 3

Mn2O7 is a

Answer 3

covalent explosive green oil

Question 4

CrO3 and V2O5

Answer 4

High oxidation states, highly covalent, low melting points

Question 5

Mn2O7 + water

Answer 5

HMnO4

Question 6

CrO3 + water

Answer 6

H2CrO4 and H2Cr2O7

Question 7

V2O5 is

Answer 7

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

Question 8

CrO

Answer 8

Basi

Question 9

Cr2O3

Answer 9

amphoteric

Question 10

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

Answer 10

leather industry
Oxidant for preparing azo compounds

Question 11

which is more soluble Na2CrO7 vs K2Cr2O7

Answer 11

Na2Cr2O7 is more soluble

Question 12

Colour of sodium chromate

Answer 12

Yellow

Question 13

Colour of sodium dichromate Na2Cr2O7. 2H2O

Answer 13

Orange

Question 14

Colour of potassium dichromate

Answer 14

Orange

Question 15

Dichromate structure

Answer 15

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

Question 16

Potassium dichromate is used as

Answer 16

Primary standard in volumetric analysis

Question 17

Magnetic behaviour of potassium permanganat

Answer 17

Diamagnetic but temperature dependent paramagnetism
explained by molecular orbital theory

Question 18

Green manganate has __ number of unpaired electrons

Answer 18

1

Question 19

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

Answer 19

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

Question 20

Oxidation of Manganous salt to MnO2 is catalysed by

Answer 20

Zinc sulphate or zinc oxide

Question 21

Potassium permangante uses

Answer 21

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

Question 22

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

Answer 22

Titanium and vanadium

Question 23

Element with highest negative enthalpy of hydration

Answer 23

Nickel

Question 24

Strong reducing agents

Answer 24

Ti2+ V2+ Cr2+

Question 25

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

Answer 25

higher lattice energy

Question 26

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

Answer 26

Higher bond enthalpy for higher covalent compoundsd

Question 27

Who can reduce Cu

Answer 27

Hot concentrated sulphuric and nitric

Question 28

Opposite inert effect in d block oopsies

Question 29

Low oxidation state by which ligands

Answer 29

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

Question 30

Variation of I.E. across period in d blcok

Answer 30

not that steep

Question 31

Exchange energy is proportional to

Answer 31

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

Question 32

Density L to R

Answer 32

increases

Question 33

Elements with a typical metal structure oopsies waala

Answer 33

Zn, Cd, Hg, Mn