An aqueous solution of Borax is-

1. Neutral 2. Amphoteric
3. Basic 4. Acidic

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 64%
From NCERT
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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 |
 73%
From NCERT
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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 |
 76%
From NCERT
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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 |
 79%
From NCERT
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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 |
 66%
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 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 |
 89%
From NCERT
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The incorrect statement regarding allotropes/allotropy is :

1. Allotropy is the existence of an element in more than one form.
2. Allotropes have the same chemical properties but different physical properties.
3. Diamond and graphite are allotropes of carbon.
4. None of the above.

Subtopic:   Structure & Properties of Allotropes of C |
 64%
From NCERT
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The correct statement(s) regarding thallium is/are :

1. Thallium displays both +1, and +3 oxidation states.

2. It resembles group 1 metals in some reactions.

3. Thallium only shows a +1 oxidation state.

4. Both (1) and (2) 

Subtopic:  Anomalous Behaviour of B & C |
 65%
From NCERT
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The incorrect statement among the given options is-

1. Inert pair effect is because of the poor shielding of the ns2 electrons by the d- and f- electrons.
2. Allotropy is the existence of an element in more than one form.
3. Catenation is the bonding of atoms of the same element into a series, called a chain.
4. None of the above.

Subtopic:  Carbon Family - Preparations, Properties & Uses |
 70%
From NCERT
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