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a
Borax in its crystal possess 2 tetrahedral and 2 plane triangular units
b
Aluminium vessels are not washed with washing soda
c
Stability of Tl⊕>In⊕>Ga⊕
d
BCl3 is not hydrolyzed while SiCl4 can be hydrolyzed.
answer is D.
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Detailed Solution
(1) Fact(2) Washing soda Na2CO3reacts with H2O to form NaOH and Al is dissolved in NaOH to give sodium meta aluminate2Al+2NaOH+2H2O⟶2NaAlO2+3H2(3) Due to inert pair effect(4) Both are hydrolyzed.