A white substance (X) when boiled with concentrated Na 2 CO 3 solution a white ppt (Y) and an aqueous solution (Z) is obtained. After the separation of
precipitate, through the filtrate excess of CO 2 gas is
passed and an aqueous solution (S) is obtained. From the aqueous solution, crystals of borax is prepared. (X) contain Ca 2+ as cation and it is water insoluble.
(i) The substance (X) is –
In the presence of polyhydroxy cis-di-ol phenolphthalein form complex Sp 3 hybridised
In the presence of polyhydroxy cis-di-ol B(OH) 4 – become insoluble Sp 2 and sp 3 hybridised
(iv) To the aqueous solution of Borax when phenolphthalein is added the solution turns pink. The pink colour is decolourised by the addition of glycerol pink solution is decolourised. Explain – All of these (v) In H 3 BO 3 (S), B is – Sp and sp 2 hybridised
Text Solution
Verified by ExpertsB
(i)
Sol. Ca 2 B 6 O 11 , 5H 2 O
(ii)
Sol. 2CaO, 3B 2 O 3 + 2Na 2 CO 3 — →
2CaCO 3 ↓ + Na 2 B 4 O 7 + 2NaBO 2
4NaBO 2 + CO 2 — → Na 2 CO 3 + Na 2 B 4 O 7
(iii)
Sol. [B 4 O 5 (OH) 4 ] 2– + 5H 2 O 
4H 3 BO 3 + 2OH – (iv)
Sol. In the presence of polyhydroxy cis-di-ol the H 3 BO 3
act as strong mono basic acid.
(v)
Sol. Sp
2 hybridised
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