EASY
WBJEE
IMPORTANT
Earn 100

To a solution of a colourless efflorescent sodium salt, when dilute acid is added, a colourless gas is evolved along with formation of a white precipitate. Acidified dichromate solution turns green, when the colourless gas is passed through it. The sodium salt is

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Important Questions on The d- and f-block Elements

EASY
WBJEE
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 22 - The d- and f-block Elements>WBJEE 2018>Q 6
Silver chloride dissolves in excess of ammonium hydroxide solution. The cation present in the resulting solution is
MEDIUM
WBJEE
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 22 - The d- and f-block Elements>WBJEE 2018>Q 7
Ferric ion forms a prussian blue precipitate due to the formation of
MEDIUM
WBJEE
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 22 - The d- and f-block Elements>WBJEE 2018>Q 8

[X]+ dil. H2SO4⟶[Y]: Colourless, suffocating gas

[Y]+K2Cr2O7+H2SO4⟶ Green colouration of solution

Then, [X] and [Y] are

EASY
WBJEE
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 22 - The d- and f-block Elements>WBJEE 2020>Q 9
The number of unpaired electrons in the uranium U92 atom is
MEDIUM
WBJEE
IMPORTANT
EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 22 - The d- and f-block Elements>WBJEE 2019>Q 10
Which atomic species cannot be used as a nuclear fuel?