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%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

Hybridisation of boron in diborane is:

1.  sp

2.  sp2

3.  sp3

4.  sp3d2

Subtopic:  Boron Family- Preparations, Properties & Uses |
 73%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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 |
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

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%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

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%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

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%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints
To view explanation, please take trial in the course.
NEET 2025 - Target Batch

advertisementadvertisement

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%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

Butter of tin is:

1.  SnCl2·5H2O

2.  SnCl4·5H2O

3.  SnBr2·2H2O

4.  SnBr4·5H2O

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
 62%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

Ordinary glass is:

1. Sodium silicate

2. Copper silicate

3. Calcium silicate

4. A mixture of calcium and sodium silicates with silica

Subtopic:  Properties of Structure of SiO2 & Other Compounds |
 76%
From NCERT
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints

advertisementadvertisement

The substance used to impart green colour to glass is:

1.  Cu2O

2.  CdS

3.  MnO2

4.  Cr2O3

Subtopic:  Properties of Glass, Pb & Sn compounds |
 65%
To view explanation, please take trial in the course.
NEET 2025 - Target Batch
Hints