Dry ice is -

1. Solid NH3

2. Solid SO2

3. Solid CO2

4. Solid N2

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
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CO is a poisonous gas because -

1. It forms a complex with hemoglobin.

2. The CO–Hb complex is about 300 times more stable than the O2–Hb complex.

3. It can kill a person through suffocation on not receiving oxygen.

4. All of the above

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
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An excessive content of CO2 is responsible for global warming as-

1. Higher the level of carbon dioxide, higher is the amount of heat trapped.

2. Higher the level of oxygen, higher is the amount of heat trapped.

3. Higher the level of carbon dioxide, lesser is the amount of heat trapped.

4. Higher the level of oxygen, lesser is the amount of heat trapped.

Subtopic:  Compounds of Carbon, 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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Carbon dioxide is a gas but silica is a solid because:

1. Carbon dioxide is composed of discrete covalent CO2 molecules whereas silica has a continuous tetrahedral structure.

2. CO2 molecules are lighter than SiO2 molecules.

3. CO2 is more acidic than SiO2.

4. The melting point of silica is very high.

Subtopic:  Compounds of Carbon, 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 hybridization of carbon in (a) CO32- (b) diamond (c) graphite is respectively-

1. sp2sp3sp2

2. sp2sp3sp3

3. sp3sp3sp2

4. sp3sp2sp3

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
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Identify the correct statements among the following:

a. CO2(g) is used as a refrigerant for ice-cream and frozen food.

b. The structure of C60 contains twelve six-carbon rings and twenty five-carbon rings.

c. ZSM-5, a type of zeolite, is used to convert alcohol into gasoline.

d. CO is a colourless and odourless gas

1. (a) and (c) only

2. (b) and (c) only

3. (c) and (d) only

4. (a), (b) and (c) only

Subtopic:  Carbon Family - Preparations, Properties & Uses | Compounds of Carbon, Preparations, Properties & Uses |
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The correct statement among the following regarding behavior of BCI3 and CCI4 in water is -

1. BCI3 readily undergoes hydrolysis while CCI4 completely resists hydrolysis.

2. CCI4  readily undergoes hydrolysis while BCI3 completely resists hydrolysis.

3. Both BCI3 and CCI4 readily undergo hydrolysis.

4. Neither BCI3 nor CCI4 undergo hydrolysis.

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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