The correct statement among the following about H3BO3 is:
1. Monobasic and weak Lewis acid

2. Monobasic and weak Bronsted acid

3. Monobasic and strong Lewis acid

4. Tribasic and weak Bronsted acid

Subtopic:  Boron Family- Preparations, Properties & Uses |
 83%
From NCERT
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On the addition of mineral acid to an aqueous solution of borax, the compound formed is:

1. borodihydride

2. orthoboric acid

3. metaboric acid

4. pyroboric acid

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 78%
From NCERT
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Borax is prepared by treating boric acid with:

(1) NaNO3

(2) NaCl

(3) Na2CO3

(4) NaHCO3

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 54%
From NCERT
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The main factor responsible for weak acidic nature of  B-F bonds in BF3 is:

(1) large electronegativity of F

(2) three centred two electrons bonds in BF3

(3) px-dπ back bonding

(4) pπ- back bonding 

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 75%
From NCERT
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 Which among the following is a gas?

1. BF3

2. BCl3

3. BBr3

4. BI3

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 67%
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B-F bond order in BF3 is:

(1) 1

(2) 2

(3) 3

(4) 4/3

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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Aluminium reacts with nitrogen to form:

1. AlN

2. Al2N3

3. Al2N

4. Al4N6

Subtopic:  Boron Family- Preparations, Properties & Uses |
 72%
From NCERT
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Which metal is powdered, suspended in oil and used as paint?

(1) Fe

(2) Sn

(3) Ag

(4) Al

Subtopic:  Boron Family- Preparations, Properties & Uses |
 58%
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Aluminium metal is corroded in coastal  places near to the sea, because protective oxide film:

(1) is removed by sea water

(2) reacts with sea water

(3) is attacked by salts present in sea water

(4) reacts with sand particles

Subtopic:  Boron Family- Preparations, Properties & Uses |
 76%
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Aluminium deposited as vapours on glass forms a good mirror, essentially because:

(1) it has better shine than Ag

(2) it does not scratch

(3) coating is much smoother

(4) it does not tarnish in air

Subtopic:  Boron Family- Preparations, Properties & Uses |
 63%
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