Questions on Some Basic Concepts of Chemistry Class 11. We covered all the Questions on Some Basic Concepts of Chemistry Class 11 in this post for free so that you can practice well for the exam.
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Questions on Some Basic Concepts of Chemistry Class 11 Objective for Students
Knowing that the Chemistry of lanthanoids (Ln) is dominated by its +3 oxidation state, which of the following statements is incorrect?
(A) The ionic sizes of Ln (III) decrease in general with increasing atomic numbers.
(B) Ln (III) compounds are generally colorless.
(C) Ln (III) hydroxides are mainly basic in character.
(D) Because of the large size of the Ln (III) ions the bonding in its compounds is predominantly ionic in character.
Option b – Ln (III) compounds are generally colorless
Iron exhibits + 2 and + 3 oxidation states. Which of the following statements about iron is incorrect?
(A) Ferrous compounds are relatively more ionic than the corresponding ferric compounds.
(B) Ferrous compounds are less volatile than the corresponding ferric compounds
(C) Ferrous compounds are more easily hydrolyzed than the corresponding ferric compounds
(D) Ferrous oxide is more basic in nature than the ferric oxide
Option c – Ferrous compounds are more easily hydrolyzed than the corresponding ferric compounds
In context with the transition elements, which of the following statements is incorrect?
(A) In the highest oxidation states, the transition metal shows basic character and forms cationic complexes.
(B) In the highest oxidation states of the first five transition elements (Sc to Mn), all the 4s and electrons are used for bonding.
(C) Once the d5 configuration is exceeded, the tendency to involve all the 3d electrons in bonding decreases.
(D) In addition to the normal oxidation states, the zero oxidation state is also shown by these elements in complexes.
Option a – In the highest oxidation states, the transition metal shows basic character and forms cationic complexes
The lanthanoid contraction is responsible for the fact that
(A) Zr and Y have about the same radius
(B) Zr and Nb have similar oxidation states
(C) Zr and Hf have about the same radius
(D) Zr and Zn have a similar oxidation state
Option c – Zr and Hf have about the same radius
Lanthanoid contraction is caused due to
(A) the same effective nuclear charge from Ce to Lu
(B) the imperfect shielding on outer electrons by 4f electrons from the nuclear charge
(C) the appreciable shielding on outer electrons by 4f electrons from the nuclear charge
(D) the appreciable shielding on outer electrons by 5d electrons from the nuclear charge
Option b – the imperfect shielding on outer electrons by 4f electrons from the nuclear charge
Identify the incorrect statement among the following
(A) d-block elements show irregular and erratic chemical properties among themselves
(B) La and Lu have partially filled d-orbitals and no other partially filled orbitals
(C) The chemistry of various lanthanoids is very similar
(D) 4f and 5f-orbitals are equally shielded
Option d – 4f and 5f-orbitals are equally shielded
The actinoids exhibit more oxidation states in general than the lanthanoids. This is because
(A) The 5f-orbitals are more buried than the 4f orbitals
(B) There is a similarity between 4f-and-5f in their angular part of the wave function
(C) The actinoids are more reactive than the lanthanoids
(D) The 5f-orbitals extend further from the nucleus than the 4f-orbitals
Option d – The 5f-orbitals extend further from the nucleus than the 4f-orbitals
Cerium (Z = 58) is an important member of the lanthanoids. Which of the following statement about cerium is incorrect
(A) Cerium (IV) acts as an oxidizing agent
(B) The +3 oxidation state of cerium is more stable than the +4 oxidation state
(C) The +4 oxidation state of cerium is not known in solutions
(D) The common oxidation states of cerium are +3 and +4
Option c – The +4 oxidation state of cerium is not known in solutions
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