Question

1. Atomic radii is expressed in
[ ]
a) Nano metre
b) Angstrom units c) Both a and b
d) Dalton

Among the following, the correct order of radii is
[ ]
a) van der Waals radii <metallic radii
b) Metallic radii < van der Waals radii
c) Covalent radii > van der Waals radii d) Crystal radius < Covalent radius

3. Covalent radii is used for
[ ]
a) Metals
b) Non-metals
c) Both a and b
d) Metalloids

4. A and B are two elements whose electronegativities are X and XB where XA> XB, then the bond
length of d - is given by
[ ]
a) d=r +18 - 0.09(X-X)
b) d=1,-1, +0.99(XA - X)
c) dans = + 13 -0.99(XA + XB)
d) dB = r +1.-0.09(XA+ XB)

5. Among the following, the iso electronic species are
[ ]
a) Ne, A1+3
b) Mg+2, Ne
c) O-2, Ne
d) Ar, Ca+2
6. The correct order of atomic (or) ionic radii is
[ ]
ce
a) Na < Be <B b) F-<0-2<N-3 c) Na < Li<K
d) Fe+3 < Fe+2 < Fe+4

7. If we go from lithium to fluorine in the second period, there would be a decrease in [ ]
a) Atomic mass b) Atomic radii
c) Both a and b
d) Atomic number

8. Among the following, the element with smallest covalent radii is
[ ]
to
b) B
C C
d) N

9. The ions O-2, F, Na+, Mg+2, A1+3 are iso electronic. Their ionic radii show
[ ]
a) An increase from 0-2 to F- and then decrease from Nat to Al+3
b) A decrease from 0-2 to F. and then increase from Nat to Al3
c) A significant increase from 0-2 to Al+3 d) A significant decrease from 0-2 to Al+3

10. Among the following the group which represents a collection of iso electronic species is [ ]
(atomic number of Cs = 55 and Br = 35)
a) N-, F., Na
b) Be, A1+3, CI c) Ca+2, Cs+1, Br d) Nat, Ca+, Mg+2
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a) Be
29.​

Answer 1

Answer:

1) c

2) b

3) b

4) b

5) a,b,c,f

6) b

7) b

8) d

9) d

10) options not vlear

Explanation:

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Answer 2

Answer:

in answer 1 part b)angstrom units

2 answer I do not but I will give you this soon

but 3 answer I now that is non- metal

4) I think it could be c) part

5) a) ne,A1+3

6) a) na-be-b

7)a ) atomic mass