Aluminium becomes passive in nitric acid because it-

1. Is a noble metal

2. Forms a thin film of oxide

3. Has a positive reduction potential

4.  None of the above

Subtopic:  Boron Family- Preparations, Properties & Uses |
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The stability of the +1 oxidation state increases in the sequence:

1. Al <Ga<In<Tl

2. Tl<In<Ga<Al

3. In<Tl<Ga<Al

4. Ga<In<Al<Tl

Subtopic:  Boron Family- Preparations, Properties & Uses |
 91%
From NCERT
AIPMT - 2009
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Borax bead test is responded by:

1.  Divalent metals

2.  Heavy metals

3.  Light metals

4.  Metal which forms coloured metaborates

Subtopic:  Boron Family- Preparations, Properties & Uses |
 85%
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Match the species given in Column I with the properties mentioned in Column II.

Column I          Column II
A.  \(\text{BF}^-_4\) 1. Oxidation state of the central atom is +4
B.  AlCl3 2. Tetrahedral shape
C.  SnO 3. Lewis acid
D.  PbO2 4. Can be further oxidized

Codes

A B C D
1. 2 3 4 1
2. 1 2 3 4
3. 1 4 3 2
4. 4 1 3 2
Subtopic:  Boron Family- Preparations, Properties & Uses |
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Aluminium chloride in acidified aqueous solution forms a complex 'A'.
The formula of A and hybridisation state of Al in 'A' is respectively:

1. [Al(H2O)6]3+, sp3d2

2. [Al(H2O)4]3+, sp3

3. [Al(H2O)4]3+, dsp2

4. [Al(H2O)]3+, d2sp3

Subtopic:  Boron Family- Preparations, Properties & Uses |
 78%
From NCERT
NEET - 2019
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Match the species given in Column I with properties given in Column II.

Column I          Column II
A. Diborane 1. Used as a flux for soldering metals
B.  Quartz 2. Crystalline form of silica
C. Borax 3. Banana bonds
D. Aluminosilicate 4. Used as a catalyst in petrochemical industries
Codes
A B C D
1. 3 4 1 2
2. 1 2 3 4
3. 3 2 1 4
4. 4 1 3 2
Subtopic:  Boron Family- Preparations, Properties & Uses |
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Ionization enthalpy (iH1kJ mol-1) for the elements of Group 13 follows the order.

1. B > Al > Ga > In > Tl 2. B < Al < Ga < In < Tl
3. B < Al > Ga < In > Tl 4. B > Al < Ga > In < Tl
Subtopic:  Boron Family- Preparations, Properties & Uses |
 70%
From NCERT
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Aluminium reacts with concentrated HCl and concentrated NaOH to liberate which of the following gases respectively-

1. \(\mathrm{H}_2 ~\text{and} ~\mathrm{H}_2 \) 2. \(\mathrm{O}_2 ~\text{and} ~\mathrm{O}_2 \)
3. \(\mathrm{O}_2 ~\text{and} ~\mathrm{H}_2 \) 4. \(\mathrm{H}_2 ~\text{and} ~\mathrm{O}_2 \)
Subtopic:  Boron Family- Preparations, Properties & Uses |
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The correct order of atomic radii of the group 13 elements is-

1. B < Al < In < Ga < Tl
2. B < Al < Ga < In < Tl
3. B < Ga < Al < Tl < In
4. B < Ga < Al < In < Tl

Subtopic:  Boron Family- Preparations, Properties & Uses |
 67%
From NCERT
NEET - 2018
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AlCl3 on hydrolysis gives -

1. Al2O3.H2O

2. AlOH3

3. Al2O3

4. AlCl3.6H2O

Subtopic:  Boron Family- Preparations, Properties & Uses |
 62%
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