Plus Two Chemistry Previous Year Questions and Answers. We covered all the Plus Two Chemistry Previous Year Questions and Answers in this post for free so that you can practice well for the exam.
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Plus Two Chemistry Previous Year Objective Questions and Answers for Students
Which one of the following statements is not correct?
(A) The oxides and hydroxides of d-block elements are less basic than those of f-block elements
(B) The size of atoms and ions of d-block elements are relatively smaller than those of f-block elements
(C) The tendency of d-block elements to form complexes is less than that of f-block elements
(D) f-block elements are called inner transition elements
Option c – The tendency of d-block elements to form complexes is less than that of f-block elements
The lanthanide contraction refers to
(A) a Decrease in the number of valence electrons of the lanthanide series
(B) The gradual contraction in the ionic radius of the lanthanide series
(C) a Decrease in the density of the series
(D) a Decrease in the nuclear mass of the series
Option b – The gradual contraction in the ionic radius of the lanthanide series
The separation of lanthanides by ion exchange method is based on
(A) the Basicity of the hydroxides
(B) Size of the ions
(C) The solubility of their nitrates
(D) The oxidation state of the metal ion
Option b – Size of the ions
Which of the following statements is not correct regarding lanthanides and actinides?
(A) The oxidation state of +3 is predominant in both the series
(B) In both series, f orbitals are progressively filled
(C) The elements of both series are radioactive
(D) Both the series show contraction as lanthanide contraction and actinide contraction
Option c – The elements of both series are radioactive
Lanthanide contraction is due to an increase in
(A) Shielding by 4f electrons
(B) Atomic number
(C) Effective nuclear charge
(D) size of 4 f-orbital
Option c – Effective nuclear charge
The basic character of the transition metal) monoxide follows the order
(A) VO> CrO > TiO > FeO
(B) CrO > VO> FeO > TiO
(C) TiO > FeO > VO > CrO
(D) TIO > VO > CrO > FeO
Option d – TIO > VO > CrO > FeO
Elements that generally exhibit multiple oxidation states and whose ions are usually colored are
(A) metalloids
(B) non-metals
(C) transition elements
(D) gases
Option c – transition elements
Which of the following substances has the least ionic character?
(A) FeCl2
(B) ZnCl2
(C) HgCl2
(D) MgCl2
Option b – ZnCl2
The atomic number (Z) of an element is 2S. In its ground state, how many electrons are present in the “N” shell?
(A) 13
(B) 2
(C) 15
(D) 3
Option c – 15
Transition metals are often paramagnetic owing to
(A) h High m.pt. and b.pt.
(B) the presence of vacant orbitals
(C) the presence of unpaired electrons
(D) malleability and ductility
Option c – the presence of unpaired electrons
Lanthanide contraction implies
(A) a Decrease in density
(B) a Decrease in mass
(C) a Decrease in ionic radii
(D) a Decrease in radioactivity
Option c – a Decrease in ionic radii
The lanthanide 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 the same oxidation state
Option c – Zr and Hf have about the same radius
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