1.

{:("List - I","List - II"),("A. Bragg's equation","1. "(nM)/(a^(3)N_(A))),("B. Density of unit cell","2. "("Total volume of all spheres in unit cell")/("Volume of unit cell")xx100),("C. Packing efficiency","3. "(r_(c^(+)))/(r_(A^(-)))),("D. Radius ratio","4. "nlambda=2d sin theta):}

Answer»

`{:(A,B,C,D),(3,4,1,2):}`
`{:(A,B,C,D),(1,2,3,4):}`
`{:(A,B,C,D),(4,1,2,3):}`
`{:(A,B,C,D),(2,3,4,1):}`

Answer :(c )4, 1, 2, 3


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