Carbon dioxide is a gas but silica is a solid because:

1.  carbon dioxide is composed of discrete covalent CO2 molecules whereas silica has continuous

     tetrahedral structure

2.  CO2 molecules are lighter than SiO2 molecules

3.  CO2 is more acidic than SiO2

4.  melting point of silica is very high

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
 79%
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The greatest percentage of CO is in:

1.  coal gas

2.  producer gas

3.  water gas

4.  oil gas

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
 55%
From NCERT
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Which of the following shows bond in silicone?

1.  SiCSiOSi

2.  SiCSiCSi

3.  Si|OSi|OSi|

4.  SiSiSiSi

Subtopic:  Properties of Structure of SiO2 & Other Compounds |
 93%
From NCERT
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Mica is chemically:

1.  potassium alumino silicate having sheet structure

2.  calcium alumino silicate having fibrous structure

3.  calcium magnesium silicate having three dimensional network

4.  hydrated sodium alumino silicate having three dimensional network

Subtopic:  Properties of Structure of SiO2 & Other Compounds |
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The incorrect statement among the following is -

1. GeOH2 is amphoteric

2. GeCl2 is more stable than GeCl4

3. GeO2 is weakly acidic

4. GeCl4 + 2HCl ⇄ H2[GeCl6]

Subtopic:  Carbon Family - Preparations, Properties & Uses |
 67%
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Silicon carbide is used as:

1. Dehydrating agent 2. Abrasive
3. Solvent 4. Catalyst
Subtopic:  Properties of Structure of SiO2 & Other Compounds |
 52%
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Mg2C3 has the following characteristics:

1.  It is called magnesium allylide

2.  It contains Mg2+ and C34-ions

3.  It on hydrolysis gives propyne

4.  All of the above

Subtopic:  Carbon Family - Preparations, Properties & Uses |
 83%
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CO reacts with chlorine in presence of sunlight to give:

1.  COCl2

2.  CO2

3.  CCl4

4.  CHCl3

Subtopic:  Carbon Family - Preparations, Properties & Uses |
 77%
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Chrome yellow is:

1.  PbCrO4

2.  K2Cr2O7

3.  PbMoO4

4.  Pb3O4

Subtopic:  Properties of Glass, Pb & Sn compounds |
 54%
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Litharge is:

1. PbO

2. PbO2

3. Pb3O4

4. PbCH3COO2

Subtopic:  Properties of Glass, Pb & Sn compounds |
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