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Published on: 24/05/2021
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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.
Cannizzaro's reaction is not given by ____________.
HCHO
CH3CHO
2.
In the nitration of benzene using a mixture of conc. H2SO4 and conc.HNO3, the species which initiates the reaction is......................... .
NO2
NO+
\({ NO }_{ 2 }^{ + }\)
\({ NO }_{ 2 }^{ - }\)
3.
Dinucleotide is obtained by joining two nucleotides together by phosphodiester linkage. Between which carbon atoms of pentose sugars of nucleotides are these linkages present ?
5' and 3'
1' and 5'
5' and 5'
3' and 3'
4.
Which of the following is not a semisynthetic polymer?
cis-Polyisoprene
Cellulose nitrate
Cellulose acetate
Vulcanised rubber
5.
How many alcohols with molecular formula C4H10O are chiral in nature?
1
2
3
4
6.
Ethylidene chloride is a/an ............
vic-dihalide
gem-dihalide
allylic halide
vinylic halide
7.
There are 14 elements in actinoid series. Which of the following elements does belong to this series ?
U
Np
Tm
Fm
8.
The colour of the coordination compounds depends on the crystal field splitting. What will be the correct order of absorption of wavelength of light in the visible region for the complexes, [Co(NH3)6]3+, [Co(CN)6]3-, [Co(H2O)6]3+
[Co(CN)6]3- > [Co(NH3)6]3+ > [Co(H2O)6]3+
[Co(NH3)6]3+ > [Co(H2O)6]3+ > [Co(CN)6]3-
[Co(H2O)6]3+ > [Co(NH3)6]3+ > [Co(CN)6]3-
[Co(CN)6]3- > [Co(NH3)6]3+ > [Co(H2O)6]3+
9.
Which of the following acids forms three series of salts?
H3PO2
H3BO3
H3PO4
H3PO3
10.
Electrolytic refining is used to purify which of the following metals?
Cu and Zn
Ge and Si
Zr and Ti
Zn and Hg
11.
In physisorption, adsorbent does not show specificity for any particular has because........................ .
involved van der Waals forces are universal
gases involved behave like ideal gases
enthalpy of adsorption is low
it is a reversible process
12.
Mark the incorrect statements.
Catalyst provides an alternative pathway to reaction mechanism
Catalyst raises the activation energy
Catalyst lowers the activation energy
Catalyst alters enthalpy change of the reaction.
13.
Which of the following statement is not correct about an inert electrode in a cell ?
It does not participate in the cell reaction
It provides surface either for oxidation or for reduction reaction
It provides surface for conduction of electrons
It provides surface for redox reaction
14.
To get an n-type semiconductor from silicon, it should be doped with a substance with valence.......................... .
2
1
3
5
15.
Colligative properties depend on .............. .
the nature of the solute particles dissolved in solution
the number of solute particles in solution
the physical properties of the solute particles dissolved in solution
the nature of solvent particles
1.
(d)
CH3CHO
2.
(c)
\({ NO }_{ 2 }^{ + }\)
3.
(a)
5' and 3'
4.
cis-Polyisoprene is a natural rubber.
5.
(a)
1
6.
(b)
gem-dihalide
7.
(c)
Tm
8.
(c)
[Co(H2O)6]3+ > [Co(NH3)6]3+ > [Co(CN)6]3-
9.
(c)
H3PO4
10.
(a)
Cu and Zn
11.
(a)
involved van der Waals forces are universal
12.
(b)
Catalyst raises the activation energy
13.
(d)
It provides surface for redox reaction
14.
(d)
5
15.
(b)
the number of solute particles in solution
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