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 |
 87%
From NCERT
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When hydrated alumina is treated with an aqueous NaOH solution, it gives-

1. NaAlO2

2. Na(Al2O3)

3. NaAl2O

4. Both (2) and (3)

Subtopic:  Boron Family- Preparations, Properties & Uses |
From NCERT
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The incorrect statement among the following options is-

1. Conc. HNO3 can be transported in an aluminium container.
2. Diamond is used as an abrasive.
3. A mixture of dilute NaOH and aluminium pieces is used to declog the drain.
4. Graphite can't be used as a lubricant.

Subtopic:  Boron Family- Preparations, Properties & Uses | Carbon Family - Preparations, Properties & Uses |
 82%
From NCERT
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Aluminum trifluoride is insoluble in anhydrous HF but dissolves on addition of NaF because:

1. Hydrogen fluoride (HF) is a covalent compound and has very strong intermolecular hydrogen bonding.
2. Sodium fluoride (NaF) is an ionic compound and free F- is available.
3. Both (1) and (2) 
4. None of the above.

Subtopic:  Boron Family- Preparations, Properties & Uses |
 84%
From NCERT
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The complex formed on reaction of Sodium hexafluoroaluminate(III) with BF3 is -

1. Na[BF4]

2. Na2[BF4]

3. Na[BF4]2

4. None of the above 

Subtopic:  Boron Family- Preparations, Properties & Uses |
 54%
From NCERT
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Incorrect statement among the following options is :

1. Tl (+1) is more stable than Tl (+3).
2. For group 13, the stability of the +3 oxidation state decreases down the group.
3. Ge, Sn, and Pb show both the +2 and + 4 states.
4. None of the above.

Subtopic:  Boron Family- Preparations, Properties & Uses | Carbon Family - Preparations, Properties & Uses |
 66%
From NCERT
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