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Class 12 Exam  >  Class 12 Questions  >  If L1 and L2 have the direction ratios a1,b1,... Start Learning for Free
If L1 and L2 have the direction ratios a1,b1,c1 and a2,b2,c2 respectively then what is the angle between the lines?
  • a)
  • b)
  • c)
  • d)
Correct answer is option 'C'. Can you explain this answer?
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If L1 and L2 have the direction ratios a1,b1,c1and a2,b2,c2 respective...
If L1 and L2 have the direction ratios
a1,b1,c1 and a2,b2,c2  respectively then the angle between the lines is given by
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Read the passage given below and answer the following questions:In ideally ionic structures, the coordination numbers of the ions are determined by electrostatic considerations. Cations surround themselves with as many anions as possible and vice versa. This maximizes the attractions between neighbouring ions of opposite charge and hence maximizes the lattice energy of the crystal. This requirement led to the formulation of the radius ratio rule for ionic structures in which the ions and the structure adopted for a particular compound depend on the relative sizes of the ions. Thus, for the stable ionic crystalline structures, there is definite radius ratio limit for a cation to fit perfectly in the lattice of anions, called radius ratio rule. This depends upon the ratio of radii of two types of ions, r+/r–.This ratio for coordination numbers 3, 4, 6 and 8 are respectively 0.155 – 0.225, 0.225 -0.414, 0.414 -0.732 and 0.732 – 1.000. The coordination number of ionic solids also depends upon temperature and pressure. On applying high pressure, coordination number increases. On the other hand, on applying high temperature, it decreases.Q. If the radius of Nation is 95 pm and that of Cl– ion is 181 pm, the coordination number of Na+ ion is

Read the passage given below and answer the following questions:In ideally ionic structures, the coordination numbers of the ions are determined by electrostatic considerations. Cations surround themselves with as many anions as possible and vice versa. This maximizes the attractions between neighbouring ions of opposite charge and hence maximizes the lattice energy of the crystal. This requirement led to the formulation of the radius ratio rule for ionic structures in which the ions and the structure adopted for a particular compound depend on the relative sizes of the ions. Thus, for the stable ionic crystalline structures, there is definite radius ratio limit for a cation to fit perfectly in the lattice of anions, called radius ratio rule. This depends upon the ratio of radii of two types of ions, r+/r–.This ratio for coordination numbers 3, 4, 6 and 8 are respectively 0.155 – 0.225, 0.225 -0.414, 0.414 -0.732 and 0.732 – 1.000. The coordination number of ionic solids also depends upon temperature and pressure. On applying high pressure, coordination number increases. On the other hand, on applying high temperature, it decreases.Q.Which is not the correct statement for ionic solids in which positive and negative ions are held by strong electrostatic attractive forces?

If L1 and L2 have the direction ratios a1,b1,c1and a2,b2,c2 respectively then what is the angle between the lines?a)b)c)d)Correct answer is option 'C'. Can you explain this answer?
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If L1 and L2 have the direction ratios a1,b1,c1and a2,b2,c2 respectively then what is the angle between the lines?a)b)c)d)Correct answer is option 'C'. Can you explain this answer? for Class 12 2025 is part of Class 12 preparation. The Question and answers have been prepared according to the Class 12 exam syllabus. Information about If L1 and L2 have the direction ratios a1,b1,c1and a2,b2,c2 respectively then what is the angle between the lines?a)b)c)d)Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 12 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for If L1 and L2 have the direction ratios a1,b1,c1and a2,b2,c2 respectively then what is the angle between the lines?a)b)c)d)Correct answer is option 'C'. Can you explain this answer?.
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