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 +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 |
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Al2O3 reacts with-

1.  Only water

2.  Only acids

3.  Only alkalis

4.  Both acids and alkalis

Subtopic:  Boron Family- Preparations, Properties & Uses |
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The correct explanation for the lower atomic radius of Ga as compared to Al is -

1. Poor shielding effect of the 2d-electrons

2. Poor shielding effect of the 3d-electrons

3. Poor shielding effect of the 3p-electrons

4. Poor shielding effect of the 2s-electrons

Subtopic:  Boron Family- Preparations, Properties & Uses |
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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 |
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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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The products formed by the oxidation of NaBH4 and l2 are:

1.  B2H6 and Nal only

2.  B2H6, H2 and Nal 

3.  Bl3 and NaH

4.  NaBl4 and Hl 

Subtopic:  Boron Family- Preparations, Properties & Uses |
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AlF3 is soluble in HF only in the presence of KF due to the formation of-

1.  K3AIF3H3
2.  K3AIF6
3.  AIH3
4.  KAIF3H

Subtopic:  Boron Family- Preparations, Properties & Uses |
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From the following, the compund(s) that react(s) with BF3 is/are -

1.  Ethers

2.  H2O

3.  NH3

4.  All of the above

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 |
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