Question

$${H_3}B{O_3}$$  is:

A. Monobasic and weak Lewis acid  
B. Monobasic and weak Bronsted acid
C. Monobasic and strong Lewis acid
D. Tribasic and weak Bronsted acid
Answer :   Monobasic and weak Lewis acid
Solution :
The central boron atom in boric acid, $${H_3}B{O_3}$$  is electrondeficient.
NOTE : Boric acid is a Lewis acid with one $$p$$ - orbital vacant. There is no $$d$$ - orbital of suitable energy in boron atom. So, it can accommodate only one additional electron pair in its outermost shell.
P - Block Elements mcq solution image

Releted MCQ Question on
Inorganic Chemistry >> P - Block Elements

Releted Question 1

The reddish brown coloured gas formed when nitric oxide is oxidised by air is

A. $${N_2}{O_5}$$
B. $${N_2}{O_4}$$
C. $$N{O_2}$$
D. $${N_2}{O_3}$$
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Releted Question 2

The temporary hardness of water due to calcium carbonate can be removed by adding —

A. $$CaC{O_3}$$
B. $$Ca{\left( {OH} \right)_2}\,$$
C. $$CaC{l_2}$$
D. $$\,HCl$$
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Releted Question 3

Which of the following is most stable to heat

A. $$HCl$$
B. $$HOCl$$
C. $$HBr$$
D. $$HI$$
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Releted Question 4

White $$P$$ reacts with caustic soda. The products are $$P{H_3}$$ and $$Na{H_2}P{O_2}.$$   This reaction is an example of

A. Oxidation
B. Reduction
C. oxidation and reduction
D. Neutralisation
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P - Block Elements

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