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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The correct statement(s) regarding diborane and boric acid is/are-

1. Diborane has two 3c-2e- bonds.

2. Boric acid has a layered structure.

3. Four 2c-2e- bonds are present in diborane.

4. All of the above

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 89%
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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The correct statement(s) among the following options is/are:

1. Aluminium alloys are used to make aircraft bodies.
2. Aluminium utensils should not be kept in water overnight.
3. Aluminium wire is used to make transmission cables.
4. All of the above

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 92%
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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The correct statement(s) regarding Lead compounds is/are:

1. Lead (II) reacts with Cl2 to give PbCl4

2. Lead (IV) chloride is highly stable towards heat.

3. Lead is not known to form an iodide, PbI4

4. Both (1) and (3)

Subtopic:  Carbon Family - Preparations, Properties & Uses |
 64%
From NCERT
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The incorrect statement regarding diamond and graphite is-

1. In diamond each carbon is sp2 hybridised and in graphite, each carbon is sp3 hybridised.
2. Diamond is an insulator
3. Graphite has a planar geometry.
4. Both (2) and (3)

Subtopic:   Structure & Properties of Allotropes of C |
 76%
From NCERT
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