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Published on: 25/05/2021
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Download CBSE Class 12th Standard CBSE Chemistry question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Chemistry
Questions + Answers key
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1.
Write the outer electronic configuration of Cr atom (Z=24).
2.
There is hardly any increase in atomic size with increasing atomic numbers in a series of transition metals. Give reason.
3.
Among landthanoids, Ln(III) compounds are predominant. however, occasionally in solutions or in solid compounds, +2 and +4 ions are also obtained. Give reason.
4.
Complete and balance the following chemical equation Cr2O72-+I-+H+ \(\longrightarrow \) _________________.
1.
Cr(24): [Ar] 3d5 4s1
2.
It is because effective nuclear charge does not increase appreciably as pairing of electrons in d-orbitals take place which cause repulsion after Mn(25).
3.
It is because effective nuclear charge does not increase appreciably as pairing of electrons in d-orbitals take place which cause repulsion after Mn(25).
4.
( )
Cr2O72-+6I-+14H+ \(\longrightarrow \)2Cr3++7H2O+3I2
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