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Q.

 Column-I Column-II
A)H3BO3P)Hydrogen bonds
B)Na2B4O7Q)Amphoteric
C)Al2O3R)Basic
D)TlOHS)Lewis acid
 ABCD
1)PSRQR
2)RQSP
3)PQRQS
4)SPQR

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a

1

b

2

c

3

d

4

answer is A.

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Detailed Solution

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A) H3BO3 Hydrogen bonds, electron deficient (Lewis acid) 
B) Na2B4O7Basic nature 
C) Al2O3  Amphoteric 
D) TlOH  Base

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