Question

If the bond lengths of C–C; C–H and C–Cl are 1.54 A0, 1.07 A0 and 1.77 A0 respectively, then radii of H, C and Cl atoms are respectively. (1) 0.30 , 0.77 , 1.00 A0 (2) 1.77 , 0.30 , 1.00 A0 (3) 1.00 , 0.30 , 0.77 A0 (4) 1.00 , 1.50 , 1.77 A0​

Answer 1

Answer:

CHEMISTRY

Atoms of element B from HCP lattice and those of the element A occupy 2/3 rd of tetrahedral voids. What is the formula of the compound formed by the elements A and B?

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ANSWER

Given that, atoms of B forms hcp lattice. So, the atoms at corners are shared by 6 unit cells. So, its contribution is

6

1

; Face centered atoms contribute

2

1

and middle layer atoms contribute 1 each.

So, effective number of atoms in unit cell =

6

1

×12+

2

1

×2+1×3

=2+1+3=6

Number of tetrahedral voids =2× Number of atoms forming the lattice.

=2×6=12

So, number of atoms of A=

3

2

×12=8

Number of atoms of B=6

So, A:B⇒A:B

8:6 4:3

So, formula is A

4

B

3