In a Borax bead test, which compound is formed: 

1. Orthoborate

2. Metaborate

3. Double oxide

4. Tetraborate

Subtopic:  Boron Family- Preparations, Properties & Uses |
 84%
From NCERT
AIPMT - 2002
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PbO2  PbO                     G298 <0
SnO2SnO                       G298 > 0

The most probable oxidation state of Pb & Sn will be:

1. Pb+4, Sn+4

2. Pb+4 , Sn+2

3. Pb+2 , Sn+2

4. Pb+2 , Sn+4

Subtopic:  Carbon Family - Preparations, Properties & Uses |
 73%
From NCERT
AIPMT - 2001
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Incorrect statement among the following about zeolites is:

1. They have an open structure which enables them to take up small molecules.
2. Zeolites are aluminosilicates having a three-dimensional network.
3. Some of the \(\mathrm{SiO}_4^{4-}\)units are replaced by \(\mathrm{AlO}_4^{5-}\) and \(\mathrm{AlO}_6^{9-}\) ions in zeolites.
4. They are used as cation exchangers.
Subtopic:  Boron Family- Preparations, Properties & Uses |
 54%
From NCERT
AIPMT - 2004
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Which of the following statements is incorrect?

1. NaHCO3 on heating gives Na2CO3.
2. Pure sodium metal dissolves in liquid ammonia to give a blue solution.
3. NaOH reacts with glass to give sodium silicate.
4. Aluminium reacts with excess NaOH to give Al(OH)3.

Subtopic:  Boron Family- Preparations, Properties & Uses |
 57%
From NCERT
AIPMT - 2011
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Which of the following oxide is amphoteric?

1. CO2 

2. SnO2

3. CaO 

4. SiO2

Subtopic:  Properties of Glass, Pb & Sn compounds |
 92%
From NCERT
AIPMT - 2011
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Which of the following oxide is amphoteric in nature?

1. SnO2

2. SiO2

3. GeO2

4. CO2

Subtopic:  Carbon Family - Preparations, Properties & Uses |
 66%
From NCERT
NEET - 2020
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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%
From NCERT
NEET - 2022
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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 |
 83%
From NCERT
NEET - 2022
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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%
From NCERT
NEET - 2022
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The chain length of silicones can be controlled by adding:
1.  \(CH_3SiCl_3\)
2.  \(SiCl_4\)
3.  \((CH_3)_2SiCl_2\)
4.  \((CH_3)_3SiCl\)

Subtopic:  Properties of Structure of SiO2 & Other Compounds |
 71%
From NCERT
NEET - 2022
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