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Chemistry · 2022 · 3 marks
The d-and f-Block ElementsGeneral Properties of the Transition Elements (d-Block)3 marksUnderstandshort answer
CBSE 2022 · Region 5 · Set 1 · Q8
Give reasons for the following statements: (a) Copper does not displace hydrogen from acids. (b) Transition metals and most of their compounds show…
Give reasons for the following statements :
(a)
Copper does not displace hydrogen from acids.
(b)
Transition metals and most of their compounds show paramagnetic behaviour.
(c)
Zn, Cd and Hg are soft metals.
Marking-scheme solution
(a) Copper shows positive E value / Cu is less reactive than hydrogen.
(b) Because of presence of unpaired electrons.
(c) They have fully filled \(\displaystyle d\)-orbitals and hence weak metallic bonding / low enthalpy of atomisation due to fully filled d-orbitals / Weak Metal-Metal bonding.
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CBSE Class 12 Chemistry past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.