Choose the correct statement:
1. Both diamond and graphite are used as dry lubricants.
2. Diamond and graphite have a two-dimensional network.
3. Diamond is covalent and graphite is ionic.
4. Diamond is sp³ hybridised and graphite is sp² hybridized.

Subtopic:   Structure & Properties of Allotropes of C |
 84%
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Which of the following is the correct statement?
1. Ga+ is more stable than ln+.
2. Al+ is more stable than ln+.
3. Ga+ is more stable than Al+.
4. Al+ is more stable than Ga+.

Subtopic:  Boron Family- Preparations, Properties & Uses |
 79%
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The chain length of silicones can be controlled by adding:
1.  \(\mathrm{CH_3SiCl_3}\)
2.  \(\mathrm{SiCl_4}\)
3.  \(\mathrm{(CH_3)_2SiCl_2}\)
4.  \(\mathrm{(CH_3)_3SiCl}\)

Subtopic:  Properties of Structure of SiO2 & Other Compounds |
 70%
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Match List-I with List-II :
List-I
(Compounds)
List-II
(Molecular formula)
(a) Borax (i) NaBO2+B2O3
(b) Kernite (ii) Na2B4O7.4H2O
(c) Orthoboric acid (iii) H3BO3
(d) Borax bead (iv) Na2B4O7.10H2O

Choose the correct answer from the options given below :
(a) (b) (c) (d)
1. (iv) (ii) (iii) (i)
2. (ii) (iv) (iii) (i)
3. (iii) (i) (iv) (ii)
4. (i) (iii) (iv) (ii)
Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 82%
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\(\mathrm{Na_2B_4O_7\xrightarrow{\text{ heat }~~}X+NaBO_2 }\)
in the above reaction the product "X" is :
1. H3BO3 2. B2O3
3. Na2B2O5 4. NaB3O5
Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 66%
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Which of the following statement is not correct about diborane?
1. Both the Boron atoms are sp2 hybridised.
2. There are two 3-centre-2-electron bonds.
3. The four terminal B-H bonds are two centre two-electron bonds.
4. The four terminal Hydrogen atoms and the two Boron atoms lie in one plane.
Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 65%
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Match the allotropes of cabon given in List I with the respective characteristics given in List II.

List-I List-II
A. Coke  I. Carbon atoms are sphybridised.
B. Diamond II. Used as a dry lubricant
C. Fullerene III. Used as a reducing agent
D. Graphite IV. Cage like molecules
 
Choose the correct answer from the options given below:
Options: (A) (B) (C) (D)
1. III IV I II
2. II IV I III
3. IV I II III
4. III I IV II
Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
 74%
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Identify the correct relationship of stability from the options provided. 
1. \(\mathrm{TlI > TlI_3}\)
2. \(\mathrm{TlCl_3 > TlCl}\)
3. \(\mathrm{InI_3 > InI }\)
4. \(\mathrm{AlCl > AlCl_3 }\)
Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 73%
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Select the element (M) whose trihalides cannot be hydrolysed to form [M(H2O)6]3+.
1. Ga 2. In 
3. Al 4. B
Subtopic:  Boron Family- Preparations, Properties & Uses |
 73%
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The \(E^{\ominus}\) values for 
\(\begin{aligned} & \mathrm{Al}^+ / \mathrm{Al}=+0.55 \mathrm{~V} \text { and } \mathrm{Tl}^{+} / \mathrm{Tl}=-0.34 \mathrm{~V} \\ & \mathrm{Al}^{3+} / \mathrm{Al}=-1.66 \mathrm{~V} \text { and } \mathrm{Tl}^{3+} / \mathrm{Tl}=+1.26 \mathrm{~V} \end{aligned} \)
The incorrect statement among the following is:

1. Al is more electropositive than TI 
2. Tl3+ is a good reducing agent than Tl1+
3. Al+ is unstable in solution. 
4. Tl can be easily oxidized to Tl+ as compared to Tl3+
Subtopic:  Boron Family- Preparations, Properties & Uses |
 64%
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