Me3SiCl is used during polymerization of organ silicones because

a.  Chain length of organic silicone polymers can be controlled by adding Me3SiCl.

b.  Me3SiCl blocks the end terminal of silicone polymer.

c.  Me3SiCl improves the quality and yield of the polymer.

d.  Me3SiCl acts as a catalyst during polymerization.

Choose the correct option:

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

Subtopic:  Properties of Structure of SiO2 & Other Compounds |
 83%
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The correct statements among the following are:

a. Fullerenes have dangling bonds.
b. Fullerenes are cage-like molecules.
c. Graphite is thermodynamically the most stable allotrope of carbon.
d. Graphite is slippery and hard and therefore used as a dry lubricant in machines.


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

Subtopic:   Structure & Properties of Allotropes of C |
 71%
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Which of the following statements are correct?

(Answer on the basis of the given figure.)


 

a. The two bridged hydrogen atoms and the two boron atoms lie in one plane
b. Out of six B-H bonds, two bonds can be described in terms of 3-center-2-electron bonds
c. Out of six B-H bonds, four B-H bonds can be described in terms of 3 center 2 electron bonds
d.  The four-terminal B-H bonds are two center-two electron angular bonds

Choose the correct option

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

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
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Match the species given in Column I with the properties mentioned in Column II.

Column I          Column II
A.  \(\text{BF}^-_4\) 1. Oxidation state of the central atom is +4
B.  AlCl3 2. Tetrahedral shape
C.  SnO 3. Lewis acid
D.  PbO2 4. Can be further oxidized

Codes

A B C D
1. 2 3 4 1
2. 1 2 3 4
3. 1 4 3 2
4. 4 1 3 2
Subtopic:  Boron Family- Preparations, Properties & Uses |
 84%
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Match the species given in Column I with properties given in Column II.

Column I          Column II
A. Diborane 1. Used as a flux for soldering metals
B.  Quartz 2. Crystalline form of silica
C. Borax 3. Banana bonds
D. Aluminosilicate 4. Used as a catalyst in petrochemical industries
Codes
A B C D
1. 3 4 1 2
2. 1 2 3 4
3. 3 2 1 4
4. 4 1 3 2
Subtopic:  Boron Family- Preparations, Properties & Uses |
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Match the species given in Column I with the hybridisation given in Column II.

A. Boron in [B(OH)4]- i. sp2
B. Aluminium in [Al(H2O)6]3+ ii. sp3
C. Carbon in Buckminsterfullerene iii. sp3d2
D. Germanium in [GeCl6]2-

Codes

Options:  A   B   C   D 
1.  ii  iii  i iii
2.  i   i  iii  ii
3. iii  ii ii i
4.  i  iii  ii  iii
Subtopic:   Structure & Properties of Allotropes of C | Properties of Structure of SiO2 & Other Compounds |
 87%
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Given below are two statements: 

Assertion (A): If aluminium atoms replace a few silicon atoms in three-dimensional network of silicon dioxide, the overall structure acquires a negative charge.
Reason (R): Aluminium is trivalent while silicon is tetravalent.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  Properties of Structure of SiO2 & Other Compounds |
 62%
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Given below are two statements: 

Assertion (A):  Silicones are water-repelling in nature.
Reason (R): Silicones are organosilicon polymers, which have  ( - R2SiO - )  as repeating units.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.

Subtopic:  Properties of Structure of SiO2 & Other Compounds |
 56%
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The linear shape of CO2 is due to _______.

a.  sp3 hybridisation of carbon

b.  sp hybridisation of carbon

c.  - bonding between carbon and oxygen

d.  sp2 hybridisation of carbon

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
 85%
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The reason for the small radius of Ga compared to Al is-.

a.  Poor screening effect of d and f orbitals

b.  Increase in nuclear charge

c.  Presence of higher orbitals

d.  Higher atomic number

Choose the correct option
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)

Subtopic:  Boron Family- Preparations, Properties & Uses |
 83%
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