Day 275: JEE Mains Chemistry

1. A.
   $Nd$
2. B.
   $Yb$
3. C.
   Dy
4. D.
   $\Pr$

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1. A.
   3,1 and 1
2. B.
   4,1 and 0
3. C.
   1,1 and 3
4. D.
   1,2 and 3

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1. A.
   All $B - H - B$ angles are of $120^{\circ}$.
2. B.
   Its fragment, ${BH}_{3}$, behaves as a Lewis base.
3. C.
   Terminal $B - H$ bonds have less $p$-character when compared to bridging bonds.
4. D.
   The two B-H-B bonds are not of same length.

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1. A.
   (A) is true but (R) is false
2. B.
   Both (A) and (R) are true but (R) is not the correct explanation of (A)
3. C.
   (A) is false but (R) is true
4. D.
   Both (A) and (R) are true and (R) is the correct explanation of (A)

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1. A.
   A-III, B-IV, C-II, D-I
2. B.
   A-III, B-II, C-I, D-IV
3. C.
   A-I, B-IV, C-II, D-III
4. D.
   A-III, B-II, C-IV, D-I

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