Mark the oxide which is amphoteric in character

(1) CO2

(2) CO

(3) SnO2

(4) CaO

Subtopic:   Structure & Properties of Allotropes of C |
 88%
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In B2H6 

(1) there is direct boron-boron bond

(2) the structure is similar to that of C2H6

(3) the boron atoms are linked through hydrogen bridges

(4) all the atoms are in one plane

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 88%
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Which of the following cation can not give borax bead test?

(a) Cr3+                          (b) Co2+

(c) Ag+                           (d) Mn2+

Subtopic:  d-Block Elements- Properties & Uses |
 75%
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Aluminium becomes passive in nitric acid because it:

1.  is a noble metal

2.  forms a thin film of oxide

3.  positive reduction potential

4.  none of the above

Subtopic:  Boron Family- Preparations, Properties & Uses |
 93%
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Hybridisation of boron in diborane is:

1.  sp

2.  sp2

3.  sp3

4.  sp3d2

Subtopic:  Boron Family- Preparations, Properties & Uses |
 73%
From NCERT
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BCl3 does not exist as dimer but BH3 exist as dimer B2H6 because:

1.chlorine is more electronegative than hydrogen

2.there is - back bonding in BCl3 but BH3 does not contain such multiple bonding

3.large sized chlorine atoms do not fit in between the small boron atoms whereas small sized hydrogen atoms get fitted between boron atoms

4.none of the above

Subtopic:  Boron Family- Preparations, Properties & Uses |
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Borax bead test is responded by:

1.  divalent metals

2.  heavy metals

3.  light metals

4.  metal which forms coloured metaborates

Subtopic:  Boron Family- Preparations, Properties & Uses |
 86%
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Carbon dioxide is a gas but silica is a solid because:

1. Carbon dioxide is composed of discrete covalent CO2 molecules whereas silica has a continuous tetrahedral structure.

2. CO2 molecules are lighter than SiO2 molecules.

3. CO2 is more acidic than SiO2.

4. The melting point of silica is very high.

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
 82%
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Which of the following shows bond in silicone?

1.  SiCSiOSi

2.  SiCSiCSi

3.  Si|OSi|OSi|

4.  SiSiSiSi

Subtopic:  Properties of Structure of SiO2 & Other Compounds |
 95%
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CO reacts with chlorine in presence of sunlight to give:

1.  COCl2

2.  CO2

3.  CCl4

4.  CHCl3

Subtopic:  Carbon Family - Preparations, Properties & Uses |
 81%
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