Arihant JEE Mains Chemistry. We covered all the Arihant JEE Mains Chemistry in this post for free so that you can practice well for the exam.
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Arihant JEE Mains Chemistry Objective for Students
Which one of the following statements about the interstitial compounds is incorrect?
(A) They retain metallic conductivity
(B) They are much harder than pure metal
(C) They have higher melting points than pure metal
(D) They are chemically reactive
Option d – They are chemically reactive
The pair of compounds that can exist together is
(A) FeCl3, SnCl2
(B) HgCl2, SnCl2
(C) FeCl2, SnCl2
(D) FeCl3, KI
Option c – FeCl2, SnCl2
Reason for lanthanide contraction
(A) Negligible screening effect of f-orbitals
(B) Increasing nuclear charge
(C) Decreasing nuclear charge
(D) Decreasing screening effect
Option a – Negligible screening effect of f-orbitals
Because of lanthanoid contraction, which of the following pairs of elements have nearly the same atomic radii? (Numbers in the parenthesis are atomic numbers)
(A) Zr(40) and Hf(72)
(B) Zr(40) and Ta(73)
(C) Ti(22) and Zr(40)
(D) Zr(40) and Nb(41)
Option a – Zr(40) and Hf(72)
The reason for the greater range of oxidation states in actionids is attributed to :
(A) Actinoid contraction
(B) 5f, 6d, and 7s levels having comparable energies
(C) 4f and 5d levels being close in energies
(D) The radioactive nature of actinoids
Option b – 5f, 6d, and 7s levels having comparable energies
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