Fullerenes

Q. The type of hybridization of boron in diborane is

1. $sp$ -hybridization
2. $s{p}^2$-hybridization
3. $s{p}^3$-hybridization
4. $s{p}^3{d}^2$-hybridization

Q.

Which of the following statement is correct for Buckminsterfullerene $C_{60}$ :

1. A five-membered ring is fused with six or five-membered rings whereas a six-membered ring can only fuse with five-membered rings
2. None of the above
3. A six-membered ring is fused with six or five-membered rings whereas a five-membered ring can only fuse with six-membered rings
4. Both six-membered rings and five-membered rings are fused with only five-membered rings.

Q. The existence of a substance in more than one solid modifications is known as :

1. Isomorphism
2. Polymorphism
3. Isotropy
4. Anisotropy

Q.

The compound used as an antifreeze is

1. Ethylene

2. Acetylene

3. Ethylene dichloride

4. Ethylene glycol

Q. $C_{60}$ an allotrope of carbon contains

1. 16 hexagons and 16 pentagons
2. 20 hexagons and 12 pentagons
3. 18 hexagons and 14 pentagons
4. 10 hexagons and 14 pentagons

Q.

Which of the following is NOT a molecular solid?

1. Solid CO₂

2. HCl

3. Diamond

4. Solid SO₂

Q. In a Buckminsterfullerene $\left(C_{60}\right)$ :

1. Carbons of six membered rings have $sp$ hybridization
2. All carbons are identical and have $s{p}^2$ hybridization.
3. (a) and (b) above.
4. Carbons in five membered rings have $s{p}^3$ hybridization

Q. Which of the following statement about fullerenes is incorrect?

1. Fullerenes are the only impure form of carbon
2. Fullerene are cage like molecules.
3. Spherical fullerenes are also called bucky balls in short
4. None of the above

Q. Buckyball or buckminster fullerene is :

1. An allotrope of carbon
2. It is referred as ${\text{C}}_{60}$
3. It has $s{p}^2-$ hybridised nature and resembles with soccer ball
4. All of these

Q. Which one of the following species has plane triangular shape?

1. $N_3^{-}$
2. $N{O}_3^{-}$
3. $N{O}_2^{-}$
4. $C{O}_2$

Q. 3.What is the general formula of polysaccharides?

Q.

Which of the following is not an amorphous form of carbon?

1. Coal

2. Charcoal

3. Diamond

4. Lamp black

Q. Identify the correct statements from the following:
(a) Solid CO is known as dry ice.
(b) The structure of $C_{60}$ contains twenty six carbon rings and twelve five carbon rings.
(c) Hydrated zeolites are used as an ion exchanger in softening of hard water.
(d) $C{O}_2$ is a colorless and odourless gas.

1. (a) and (c) only
2. (b) and (c) only
3. (c) and (d) only
4. (b), (c) and (d) only

Q. Assertion :Fullerences ar the only pure form of carbon.
Reason: It contains twenty, five membered rings and twelve, six- membered rings.

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. Identify the correct statements from the following:
(a) $C{O}_2\left(g\right)$ is used as refrigerant for ice-cream and frozen food.
(b) The structure of $C_{60}$ contains twelve six carbon rings and twenty five carbon rings.
(c) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline.
(d) $CO$ is colourless and odourless gas.

1. (c) and (d) only
2. (a) and (c) only
3. (a) , (b) and (c) only
4. (b) and (c) only

Q.

State whether the following statements are true or false :

If a diamond is heated above 1500°C in the absence of air, it is transformed into graphite.

1. True
2. False

Q. $C_{60}$ contains

1. 20 pentagons and 12 hexagons
2. 12 pentagons and 20 hexagons
3. 30 pentagons and 30 hexagons
4. 24 pentagons and 36 hexagons

Q. $C_{60}$ an allotrope of carbon contains

1. 16 hexagons and 16 pentagons
2. 20 hexagons and 12 pentagons
3. 18 hexagons and 14 pentagons
4. 10 hexagons and 14 pentagons

Q.

Rewrite the correct statement:

In amorphous forms of carbon, carbon atoms are arranged in an ordered pattern.

Q. Write uses of Fullerene.

Q. The high melting and boiling points of diamond are due to :

1. its high refractive index
2. its high IP value
3. its high electronegativity
4. giant polymer structure with strong covalent bonds

Q. 33. Which of the following complex has a shapedifferent from others?(a) \lbrack Zn (NH3)4\rbrack2+ (b)(c) \lbrack Cu (CN)41(\lbrack Ni (CO)4\rbrack(d) \lbrack Cu (NH3 412

Q. Write the number of six membered and five membered rings in Fullerenes.

Q.

From the thermo chemical reactions,

$C_{\left(graphite\right)}+\frac{1}{2}{O}_2\to CO;\Delta H=-110.5KJ$

$CO+\frac{1}{2}{O}_2\to C{O}_2;\Delta H=-283.2KJ.$

$\Delta H$ for the reaction, $C_{\left(graphite\right)}+O_2\to C{O}_2$ is:

1. -393.7 KJ
2. +393.7 KJ
3. -172.7 KJ
4. +172.7 KJ

Q. Fullerenes have _______ number of carbon atoms.

1. 60
2. 70
3. 120
4. 50

Q. $C_{60}$ allotrope of carbon contains:

JEE MAIN 2019

1. 16 hexagons and 16 pentagons
2. 18 hexagons and 14 pentagons
3. 12 hexagons and 20 pentagons
4. 20 hexagons and 12 pentagons

Q. Densities of diamond and graphite are $3.5$ g/mL and $2.3$ g/mL.
$C\left(diamond\right)\rightleftharpoons C\left(graphite\right)$ ${\Delta }_{r}H=-1.9$ kJ/mole
Favourable conditions for formation of diamond are:

1. high pressure and low pressure
2. low pressure and high temperature
3. high pressure and high temperature
4. low pressure and low temperature

Q. Which of the following should be most volatile?
(I) $C{H}_{3}C{H}_{2}C{H}_{2}N{H}_2$
(II) $(C{H}_3{)}_{3}N$
(III) Ref. image
(IV) $C{H}_{3}C{H}_{2}C{H}_3$

1. II
2. IV
3. III
4. I

Q. The incorrect statement regarding the structure of $C_{60}$ is

1. It contains 12 six-membered rings and 24 five-membered rings
2. The six-membered rings are fused to both six and five-membered rings
3. Each carbon atom forms three sigma bonds
4. The five-membered rings are fused only to six-membered rings

Q. Assertion :(Ref image) is 3-methyl cyclopentene. Reason: In numbering, double bonded carbon atoms gets preference to alkyl group in cycloalkenes.

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