12th Standard CBSE Syllabus & Materials
12th Standard CBSE
CBSE 12th Economics Government Budget and the Economy Previous year Question Papers Study Material - QB365 Set A
NEW12th Standard CBSE
CBSE 12th Computer Science Interface Python with MySQL - New Previous year Question Papers Study Material - QB365 Set A
NEW12th Standard CBSE
CBSE 12th Computer Science Database Concept - New Previous year Question Papers Study Material - QB365 Set A
NEW12th Standard CBSE
CBSE 12th Computer Science Data Communication - New Previous year Question Papers Study Material - QB365 Set A
NEW12th Standard CBSE
CBSE 12th Computer Science Data Structures - New Previous year Question Papers Study Material - QB365 Set A
NEW12th Standard CBSE
CBSE 12th Computer Science Functions - New Previous year Question Papers Study Material - QB365 Set A
Published on: 24/05/2021
QB365 Provides the updated NCERT Exemplar Questions for Class 12, and also provide the detail solution for each and every NCERT Exemplar questions. NCERT Exemplar questions are latest updated question pattern from NCERT, QB365 will helps to get more marks in Exams
Download CBSE Class 12th Standard CBSE Chemistry question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 12th Standard CBSE Chemistry
Questions + Answers key
Take MCQ Chemistry Test
1.
Which one among the following is the strongest oxidizing agent? \(CIO^{-}_{4}, BrO^{-}_{4}, IO^{-}_{4}.\)
2.
Write the structure of a chalcogenide dianion.
3.
Why is white phosphorus kept under water ?
4.
Which of the following is/are not known ? PCl3, AsCl3, SbCl3, NCl5, BiCl5.
5.
Out of H2O and H2S, which one has higher bond angle and why?
6.
What causes Brownian movement in a colloidal solution?
7.
Benzaldehyde can be obtained from benzal chloride Write reactions for obtaining benzal chloride and then benzaldehyde from it.
8.
Name the central metal ion present in haemoglobin and vitamin B12.
9.
What type of bonding occurs in globular proteins ?
10.
Name the monosaccharide units in maltose.
11.
Which is the most common oxidation contraction ?
12.
Among octahedral and tetrahedral crystal fields, in which case the magnitude of crystal field splitting is larger ?
13.
The relative ease of dehydration of alcohols is : tertiary > secondary > primary
14.
________ is the branch of chemistry which deals with the treatment of diseases using chemicals.
1.
( )
Amongst \(CIO^{-}_{4}{E^o=+1.19 V}, BrO^{-}_{4}{E^o=+1.74 V}, IO^{-}_{4}{E^o=+1.65 V}, \ BrO^{-}_{4}\) has the highest electrode potential and hence it is the strongest oxidising agent.
2.
( )
O2-, S2- or Se2-, etc.
3.
( )
Due to angle strain and weaker forces of attraction, ignition temperature of white P is very low (303 K). Therefore, on exposure to air, it spontaneously catches fire forming P4O10. Therefore, to protect it protect it from air, it is kept under water.
4.
( )
(i) NCl5 (due to absence of d-orbitals)
(ii) BiCl5 (Bi5+ being an oxidising agent oxidises Cl- ion to Cl2 and Cl-ion being a reducing agent reduces Bi5+ to Bi 3+).
5.
( )
H2O has larger bond angle than H2S because oxygen is more electronegative than sulphur and there is more bond-pair, bond-pair repulsion of two O-H bonds.
6.
( )
It is due to unbalanced collision between colloidal particles and with the particles of dispersion medium.
7.
It is the commercial method for preparing benzaldehyde. Benzal chloride can be obtained by photochlorination of toluene i.e., chlorination of toluene in presence of sunlight.
Then, benzal chloride on heating with boiling water produces benzaldehyde as shown below.
8.
Haemoglobin __ Iron (Fe) and vitamin -B12 _ Cobalt (Co).
9.
van der Waals interactions, disulphide bridges, dipolar interactions (ionic) and hydrogen bonding.
10.
Two α−D glucose units.
11.
+3
12.
It is larger in case of octahedral crystal field \(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\((\triangle_t=4/9\ \triangle_0\ or\ \triangle_0\ =\ 9/4\ \triangle_t).\)\)
13.
The dehydration of alcohols occurs through carbocation intermediates. Since the stability of carbocations decreases in the order 30 > 20 > 10. Therefore, dehydration of alcohols follows the same order, i.e., tertiary > secondary > primary.
14.
( )
Chemotherapy
12th Standard CBSE Syllabus & Materials
12th Standard CBSE
CBSE 12th Computer Science Python Revision Tour I - New Previous year Question Papers Study Material - QB365 Set A
NEW12th Standard CBSE
CBSE 12th Business Studies Planning Important Questions And Answers Study Material - QB365 Set A
NEW12th Standard CBSE
CBSE 12th Business Studies Business Environment Important Questions And Answers Study Material - QB365 Set A
NEW12th Standard CBSE
CBSE 12th Business Studies Principles of Management Important Questions And Answers Study Material - QB365 Set A
NCERT Books
Syllabus
Exam Pattern
Sample Question Papers
Previous year Question Papers
Important Notes
MCQ Practice test
NCERT Exemplers
Case study Questions
Image Based Questions
Passage based Questions
HOT Questions
Value Based Questions
Model Questions Papers
NCERT ( Book Back ) Questions
Assertion and Reason
Important Questions And Answers
CBSE 12th Standard CBSE Subjects
CBSE Standards
