EASY
JEE Main/Advance
IMPORTANT
Earn 100

The chromate ion in acidic medium changes to . (write name)

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Important Questions on The d- and f-Block Elements

HARD
JEE Main/Advance
IMPORTANT
Among the ion, Sc3+,V3+ and Cr3+, the ion Sc3+is _____. (coloured, colourless)
HARD
JEE Main/Advance
IMPORTANT
When mixture of NaCl and K2Cr2O7 is gently warmed with conc. H2SO4 then compound X is formed. What is the oxidation state of central atom of X.
HARD
JEE Main/Advance
IMPORTANT
Number of ions which gives blue colour in aqueous state:
V+4,Ni+2,Ti+3,Co+2,Fe+3,Cu+2
HARD
JEE Main/Advance
IMPORTANT

Define the oxidation states of Mn in product of the given reaction

3 K2MnO4+2H2O+4CO22X+Y+4KHCO3

If the oxidation state of Mn in product X and Y are n1 and n2 respectively. Then find out the value of n1+n2-

HARD
JEE Main/Advance
IMPORTANT

Find number of metal ion which can produce high spin and low spin octahedral complex:

Sc+3,Ti+3, V+3,Cr+3,Mn+3,Fe+3,Co+3,Ni+2

HARD
JEE Main/Advance
IMPORTANT
Which of the following form blue colour product with CuSO4 solution. excess of NH3, excess of H2O, excess of KCN, excess of NaOH, excess of Na2 S2O3
HARD
JEE Main/Advance
IMPORTANT

Find the number of following chemical spieces which decolorize acidic solution of KMnO4

KI,Na2SO3,Na2SO4,NaCl,O3

EASY
JEE Main/Advance
IMPORTANT
The elements in which electrons are progressively filled in 4f orbital are called