Occurrence of Carbon

Q. Statement 1: Coal and coke are examples of crystalline forms of carbon.

Statement 2: Graphite and diamonds are examples of non-crystalline forms of carbon.

1. Both statements 1 and 2 are true.
2. Both statements 1 and 2 are false.
3. Statement 1 is false and statement 2 is true.
4. Statement 1 is true and statement 2 is false.

Q.

What is anthracene??what is the use of it???

Q. Which of the following statement about graphite and diamond is true?

1. They have the same crystal lattice structure
2. They have the same degree of hardness
3. They have the same electric conductivity
4. The melting points of both are very high

Q.

Which of the following organic compounds is unsaturated? ${\mathbf{CH}}_{\mathbf{4}}$ or ${\mathbf{C}}_{\mathbf{2}}{\mathbf{H}}_{\mathbf{4}}$

Q. Carbon is found in its native state in all the given compounds except .

1. coal
2. diamond
3. carbon dioxide

Q. (a) Define allotropy.
(b) Comment on the allotrope of carbon that looks like a football. What is it known as?

Q.

Lampblack is used in making

1. Shoe polish

2. black paint

3. ink

4. all of these

Q. Pick out the suitable statements for the given compound.

${\text{CH}}_3-{\text{CH}}_2-{\text{CH}}_2-\text{CH}=\text{CH}-{\text{CH}}_3$

1. It's a saturated compound
2. It's an alkene
3. General formula of the compound is ${\text{C}}_{\text{n}}{\text{H}}_{\text{2n}}$
4. IUPAC name is hex-4-ene

Q. Carbon has __________ valence electron(s).

1. 1
2. 3
3. 4
4. 2

Q. Assertion :Carbon and its compounds used as fuels for most applications. Reason: When carbon is heated in presence of excess of air or oxygen, it forms carbon dioxide. During its formation, a large amount of heat and light are released. Further, once ignited, carbon and its compounds keep on burning without needing additional heat energy.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
3. Assertion is correct but Reason is incorrect.
4. Both Assertion and Reason are incorrect.

Q.

What is the term used for converting dead vegetation into coal?

1. Carburising

2. Oxygenation

3. Carbonisation

4. Liquefaction

Q. How does graphite act as a lubricant?

Q. Which symbol is used for the element carbon?

1. $C$
2. $Ca$
3. $Cn$
4. $Co$
5. $Cu$

Q.

45) Which among the following is widely used in the match industry ?

1. N₂( Nitrogen)

2. C(Carbon)

3. P (Phosphorous)

4. Cl₂(Chlorine)

Q.

------------- is used for making shoe polishers?

Q.

(a) What are the two properties of carbon which lead to the huge number of carbon compounds we see around us ?

(b) How does carbon reacts with oxygen?

(c) Differentiate between diamond and graphite.

Q. Hydrogen chloride has the following use(s):

1. In the manufacture of dyes, drugs, paints.
2. In the milk and beverage industry
3. In tanning of leather and soldering works.
4. None of the above

Q. Which of the following is used in making printer ink, shoe polish, and black varnish?

1. Lamp black
2. Bone black
3. Carbon black
4. None of the above

Q.

Fill in the blanks with suitable words:

Carbon black is used as a_______in the manufacture of tyres to increase their durability.

Q.

In which fuel gas hydrogen is NOT a main constituent?

1. Water gas

2. Producer gas

3. Coal gas

4. Semi water gas

Q.

Hydrogen chloride has the following use(s):

1. In the manufacture of dyes, drugs, paints.

2. In the milk and beverage industry

3. In tanning of leather and soldering works.

4. None of the above

Q. On earth, all living cells are _______ based.

1. carbon
2. nitrogen
3. oxygen
4. helium

Q. Which amongst the following is an unsaturated hydrocarbon?

1. Pentane
2. Ethane
3. Butane
4. Ethyne

Q. What will be the word root in the nomenclature of a compound with six carbon atoms in the main chain?

1. But
2. Pent
3. Hex
4. Dec

Q. How many carbon-hydrogen single bond are present in ethyne?

1. Three
2. One
3. Two
4. Zero

Q. Which of the following fuels contain carbon in them?

1. Coal
2. Petroleum
3. Biogas
4. Natural gas

Q.

_______________ is used in making shoe polish and printers ink.

Q. Which type of carbon used in gas masks?

1. Graphite
2. Gas carbon
3. Lamp black
4. Wood charcoal

Q. A carbon microphone is used in a

1. dynamo
2. telephone
3. None of these
4. transformer

Q. A solid element $X$ has four electrons in the outermost shell of its atom. An allotrope $Y$ of this element is used as a dry lubricant in machinery and also in making pencil leads.
(a) What is element $X$?
(b) Name the allotrope $Y$.
(c) State whether $Y$ is a good or bad conductor of electricity.
(d) Name one use of $Y$ (other than lubrication and pencil leads)
(e) Name two other allotropes of the element $X$.