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 |
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\(\mathrm{Al}_2 \mathrm{O}_3\) 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. K3[AlF3H3] 2. K3[AlF6]
3. AlH3 4. K[AlF3H]
Subtopic:  Boron Family- Preparations, Properties & Uses |
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From the following, the compound(s) that react(s) with \(\mathrm{BF}_3\) is/are -

1. Ethers 2. \( \mathrm{H}_2 \mathrm{O} \)
3. \(\mathrm{NH}_3 \) 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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