Solid State Class 12th | Crystal Density | Packing & it's type | NEET & JEE | By Jay Daiya Sir

Electricity - 3 |Class - 10th Physics| Science Chapter 12| CBSE NCERT | Rajesh Suthar Sir

Examine the defective crystal given below and answer the question that follows : State if the above defect is stoichiometric or non-stoichiometric. How does this defect affect the density of the crystal ? Also, write the term used for this type of defect.

Examine the illustration of a portion of the deffective crystal and answer the following question : (a) What are these type of vacancy defects called ? (b) How is the density of a crystal affected by these defects ? (c) Name one ionic compound which can show this type of defect in the crystalline state. (d) How is the stoichiometry of the compound affected ?

A solid A^(+)B^(-) has NaCl -type close-packed structure. If the anion has a radius of 250 pm, what should be the ideal radius for the cation? Can a cation C^(+) having radius of 180 pm be slipped into the tetrahedral site of the crystal A^(+)B^(-) ? Give reason for your answer.

The following bar graph (Figure) represents the heights (in cm) of 50 students of Class XI of a particular school. Study the graph and answer the following questions: What percentage of the total number of students have their heights more than 149 cm? How many students in the class are in the range of maximum height of the class? The school wants to provide a particular type of tonic to each student below the height of 150cm to improve his height. If the cost of the tonic for each student comes out to be Rs. 55, how much amount of money is required? How many students are in the range of shortest height of the class? State whether true or false: There are 9 students in the class whose heights are in the range of 155-159 cm. Maximum height (in cm) of a student in the class is 17. There are 29 students in the class whose heights are in the range of 145-154 cm. Minimum height (in cm) of a student is the class is in the range of 140-144cms. The number of students in the class having their heights less than 150cm is 12. There are 14 students each of whom has height more than 154 cm.

NaCl is a AB type of solid . Its crystalline structure is known as rock salt structure in which r_"Na"^+ and r_"Cl"^- are 95 and 181 pm respectively , where Cl^- is present at the lattice point of face centered cubic unit cell Na^+ ions are located in void and those compounds which have same crystalline structure also have same coordination system in which Na^+ and Cl^- ions are surrounded by certain number of opposite ions respectively. Under high pressure coordination number changes to 8 :8 type from 6 :6 type. What is the number of second nearest neighbours of Na^+ in NaCl crystal ? a. 6 b. 12 c. 8 d. 4

A solid A^(o+)B^(ɵ) has NaCl -type close-packed structure. If the anion has a radius of 250 pm, what should be the ideal radius for the cation? Can a cation C^(o+) having radius of 180 pm be slipped into the tetrahedral site of the crystal A^(o+)B^(ɵ) ? Give reason for your answer.

Ionic solid B^+A^(-) crystallizes in rock salt type of structure.1.296 gm ionic solid salt B^+A^(-) is dissolved in water to make one litre solution.The pH of the solution is measured to be 6.0.if the value of face diagonal in the unit cell of B^+A^(-) be 600sqrt2 pm.Calculate the density of ionic solid in gm/cc. (T=298 K, K_b "for" BOH "is" 10^(-6) ,(Avogadro Number = 6.0xx10^(23) ))