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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Amphoteric oxides are:

1. Tl2O3SiO2

2. CO2B2O3

3. B2O3SiO2

4. AI2O3PbO2

Subtopic:  Compounds of Boron- Preparations, Properties & Uses | Carbon Family - Preparations, Properties & Uses |
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When a metal X is treated with sodium hydroxide, a white precipitate (A) is obtained, which is soluble in excess of NaOH to give soluble complex (B). Compound (A) is soluble in dilute HCl and forms compound (C). The compound (A) when heated strongly gives (D), which is used to extract the metal.

X, C & D are respectively - 

1. Aluminium, aluminium chloride, alumina

2. Aluminium, aluminium hydroxide, aluminium chloride

3. Aluminium hydroxide, aluminium chloride, aluminium

4. Aluminium hydroxide, aluminium chloride, sodium tetrahydroxoaluminate

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
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An aqueous solution of Borax is-

1. Neutral

2. Amphoteric

3. Basic

4. Acidic

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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Boric acid is polymeric due to-

1. Its acidic nature.

2. The presence of hydrogen bonds.

3. Its monobasic nature.

4. Its geometry.

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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The hybridization of boron in diborane is-

1. sp

2. sp2

3. sp3

4. dsp2

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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Thermodynamically the most stable form of carbon is-

1. Diamond

2. Graphite

3 Fullerenes

4. Coal

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
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The incorrect statement among the given options is -

1. CO2 can be prepared by the action of dilute hydrochloric acid on calcium carbonate. 

2. CO is prepared by the dehydration of formic acid with conc. H2SO4

3. CO2 is commercially prepared by passing steam over hot coke. 

4. CO is commercially prepared by passing steam over hot coke. 

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
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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 |
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The correct reaction(s) among the following options is/are -

1. SiO2 +4HF  SiF4 + 2H2O

2. ZnO + CO  Zn +CO2

3. SiF4 + 2HF  H2SiF6

4. All of the above

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
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