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Class 12 Exam  >  Class 12 Questions  >  Consider the following statements, "Accor... Start Learning for Free
Consider the following statements, "According the Werner's theory. :
(1) Ligands are connected to the metal ions by covalent bonds.
(2) Secondary valencies have directional properties.
(3) Secondary valencies are non-ionisable.
(4) Secondary valencies are satisfied by either neutral or negative legands.
Of these statements.
  • a)
    2, 3 and 4 are correct
  • b)
    2 and 3 are correct
  • c)
    1 and 3 are correct
  • d)
    1, 2 and 4 are correct
Correct answer is option 'A'. Can you explain this answer?
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Consider the following statements, "According the Werner's the...
According to Werner's theory of coordination compounds, the central metal ion is surrounded by a certain number of ligands, which are attached to the metal ion through coordinate covalent bonds. Let's analyze each statement to determine which ones are correct.

(1) Ligands are connected to the metal ions by covalent bonds:
This statement is incorrect. In Werner's theory, ligands are connected to the metal ions through coordinate covalent bonds, where the ligand donates a lone pair of electrons to the metal ion. This results in the formation of a bond between the metal and the ligand, with the metal ion acting as an electron acceptor.

(2) Secondary valencies have directional properties:
This statement is correct. According to Werner's theory, secondary valencies or coordination bonds have directional properties. This means that the ligands can approach the central metal ion from specific directions to form the coordination complex. The geometry and shape of the coordination complex depend on the directionality of the secondary valencies.

(3) Secondary valencies are non-ionizable:
This statement is correct. Secondary valencies are non-ionizable, meaning they do not dissociate into ions in solution. The coordination complex as a whole remains intact and does not break down into separate ions.

(4) Secondary valencies are satisfied by either neutral or negative ligands:
This statement is correct. Secondary valencies can be satisfied by ligands that are either neutral or negatively charged. Neutral ligands donate a lone pair of electrons to form the coordinate covalent bond, while negatively charged ligands donate the lone pair of electrons along with their negative charge.

Based on the analysis, statements (2), (3), and (4) are correct. Therefore, the correct answer is option 'A' - 2, 3, and 4 are correct.
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Read the passage given below and answer the following questions:The d block elements are the 40 elements contained in the four rows of ten columns (3-12) in the periodic table. As all the d block elements are metallic, the term d-block metals is synonymous. This set of d-block elements is also often identified as the transition metals, but sometimes the group 12 elements (zinc, cadmium, mercury) are excluded from the transition metals as the transition elements are defined as those with partly filled d or f shells in their compounds. Inclusion of the elements zinc, cadmium and mercury is necessary as some properties of the group 12 elements are appropriate logically to include with a discussion of transition metal chemistry. The term transition element or transition metal appeared to derive from early studies of periodicity such as the Mendeleev periodic table of the elements. His horizontal table of the elements was an attempt to group the elements together so that the chemistry of elements might be explained and predicted. In this table there are eight groups labeled I-VIII with each subdivided into A and B subgroups. Mendeleev recognized that certain properties of elements in Group VIII are related to those of some of the elements in Group VII and those at the start of the next row Group I. In that sense, these elements might be described as possessing properties transitional from one row of the table to the next.In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage.Assertion (

Read the passage given below and answer the following questions:The d block elements are the 40 elements contained in the four rows of ten columns (3-12) in the periodic table. As all the d block elements are metallic, the term d-block metals is synonymous. This set of d-block elements is also often identified as the transition metals, but sometimes the group 12 elements (zinc, cadmium, mercury) are excluded from the transition metals as the transition elements are defined as those with partly filled d or f shells in their compounds. Inclusion of the elements zinc, cadmium and mercury is necessary as some properties of the group 12 elements are appropriate logically to include with a discussion of transition metal chemistry. The term transition element or transition metal appeared to derive from early studies of periodicity such as the Mendeleev periodic table of the elements. His horizontal table of the elements was an attempt to group the elements together so that the chemistry of elements might be explained and predicted. In this table there are eight groups labeled I-VIII with each subdivided into A and B subgroups. Mendeleev recognized that certain properties of elements in Group VIII are related to those of some of the elements in Group VII and those at the start of the next row Group I. In that sense, these elements might be described as possessing properties transitional from one row of the table to the next.In the following questions, a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices on the basis of the above passage.Assertion (

Consider the following statements, "According the Werner's theory. :(1) Ligands are connected to the metal ions by covalent bonds.(2) Secondary valencies have directional properties.(3) Secondary valencies are non-ionisable.(4) Secondary valencies are satisfied by either neutral or negative legands.Of these statements.a)2, 3 and 4 are correctb)2 and 3 are correctc)1 and 3 are correctd)1, 2 and 4 are correctCorrect answer is option 'A'. Can you explain this answer?
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