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Direction (Q. Nos. 19 and 20) This section contains 1 paragraph, which describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).
 
Passage
The following pictures show the electrons population of the composite s-d bands for three transition metals :
Metals with the highest and lowest melting points respectively are
  • a)
     P and Q
  • b)
     P and R
  • c)
     Q and R
  • d)
     R and Q
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Direction (Q. Nos. 19 and 20) This section contains 1 paragraph, which...
P indicates that bonding molecular orbitals are empty.
Q indicates that bonding molecular orbitals are filled.
R indicates that bonding and antibonding molecular orbitals are filled.
Highest melting point is for the metal having filled bonding molecular orbitals (they have maximum bond order). Lowest melting point is for the metal having filled bonding and anti-bonding molecular orbitals thus, bond order is zero. Increasing order of hardness of the metals is R < P< Q
Hardness increases with increasing bond order.
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Direction (Q. Nos. 19 and 20) This section contains 1 paragraph, which describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).Passage The following pictures show the electrons population of the composite s-d bands for three transition metals :Metals with the highest and lowest melting points respectively area)P and Qb)P and Rc)Q and Rd)Rand QCorrect answer is option 'C'. Can you explain this answer?
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Direction (Q. Nos. 19 and 20) This section contains 1 paragraph, which describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).Passage The following pictures show the electrons population of the composite s-d bands for three transition metals :Metals with the highest and lowest melting points respectively area)P and Qb)P and Rc)Q and Rd)Rand QCorrect answer is option 'C'. Can you explain this answer? for Class 12 2024 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about Direction (Q. Nos. 19 and 20) This section contains 1 paragraph, which describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).Passage The following pictures show the electrons population of the composite s-d bands for three transition metals :Metals with the highest and lowest melting points respectively area)P and Qb)P and Rc)Q and Rd)Rand QCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Direction (Q. Nos. 19 and 20) This section contains 1 paragraph, which describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).Passage The following pictures show the electrons population of the composite s-d bands for three transition metals :Metals with the highest and lowest melting points respectively area)P and Qb)P and Rc)Q and Rd)Rand QCorrect answer is option 'C'. Can you explain this answer?.
Solutions for Direction (Q. Nos. 19 and 20) This section contains 1 paragraph, which describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer among the four given options (a), (b), (c) and (d).Passage The following pictures show the electrons population of the composite s-d bands for three transition metals :Metals with the highest and lowest melting points respectively area)P and Qb)P and Rc)Q and Rd)Rand QCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 12. Download more important topics, notes, lectures and mock test series for Class 12 Exam by signing up for free.
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