MEDIUM
12th West Bengal Board
IMPORTANT
Earn 100

State any four uses of K2Cr2O7.

Important Questions on d- and f-Block Elements

MEDIUM
12th West Bengal Board
IMPORTANT
What is an alloy? Name the two types of alloys formed by transition elements. Give one example of solid solution in relation to a smooth alloy.
MEDIUM
12th West Bengal Board
IMPORTANT
Predict with justification the number of moles of KI that would be oxidised by acidified aqueous solution of one mole of K2Cr2O7.
MEDIUM
12th West Bengal Board
IMPORTANT
Predict with justification the number of moles of KI that would be oxidised by acidified aqueous solution of one mole of KMnO4.
MEDIUM
12th West Bengal Board
IMPORTANT
Transition metals easily form intermetallic alloys. What property of these metals would you consider to be responsible for it?
MEDIUM
12th West Bengal Board
IMPORTANT
La57 and Lu71  have no partially filled 4f-sub-shell, yet these are included in lanthanoids. Explain.
EASY
12th West Bengal Board
IMPORTANT
Why the elements with atomic number 57 to 71 are called inner transition elements?
MEDIUM
12th West Bengal Board
IMPORTANT
Comment upon the statement that the electronic configurations of lanthanoid metals are not known with certainty.
EASY
12th West Bengal Board
IMPORTANT
Comment upon the statement that strictly speaking, the lanthanoids should include only thirteen elements with atomic number ranging from 58 to 70.