CBSE 12 Chemistry Question Paper-2023 Set-2 by Pavan | Practice Test to Test Your Knowledge
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  2. Practice Tests
  3. CBSE 12 Chemistry Question Paper-2023 Set-2
CBSE 12 Chemistry Question Paper-2023 Set-2

CBSE 12 Chemistry Question Paper-2023 Set-2

This mock test includes actual CBSE Class 12 Chemistry board exam questions from the year 2023 Set-2, helping students understand exam trends and practice real paper format

2025-08-16
Pavan Pavan
CBSE Chemistry 2023 Grade 12 Class 12

Duration

31 min

Questions

31

Marking

Negative

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Questions Preview

The conversion of an alkyl halide into an alkene by alcoholic KOH is classified as

A
a dehydration reaction
B
an addition reaction
C
a substitution reaction
D
a dehydrohalogenation reaction

The oxidation state of Fe in Fe(CO)5 is

A
0
B
+2
C
+5
D
+3

Among the following, which is the strongest base?

A
Benzene ring with an attached -NH2 group
B
Benzene ring with an attached -CH2-NH2 group
C
Benzene ring with an attached -NO2 and -NH2 group
D
Benzene ring with an attached -CH3 and -NH2 group

The slope in the plot of ln[R] vs. time for a first order reaction is

A
+k/2.303
B
-k
C
+k
D
-k/2.303

An a-helix is a structural feature of

A
Sucrose
B
Polypeptides
C
Starch
D
Nucleotides

Racemisation occurs in

A
SN2 reaction
B
SN1 reaction
C
Neither SN1 nor SN2 reaction
D
Both SN2 and SN1 reactions

Value of Henry's constant KH:

A
increases with decrease in temperature
B
decreases with increase in temperature
C
increases with increase in temperature
D
remains constant

Which of the following solutions of KCl will have the highest value of molar conductivity?

A
0.5 M
B
0.1 M
C
1 M
D
0.01 M

Which of the following reactions are feasible ?

A
Both (a) and (b)
B
CH3CH2Br + Na+O-C(CH3)3 -> CH3CH2-O-C(CH3)3
C
Neither (a) nor (b)
D
(CH3)3C-Cl + Na+O-CH2CH3 -> CH3CH2-O-C(CH3)3

Which of the following is most reactive in nucleophilic addition reactions?

A
CH3COCH3
B
CH3COC2H5
C
HCHO
D
CH3CHO

Which of the following belongs to the class of Vinyl halides?

A
CH2=CH-CH2-Br
B
CH≡C-Br
C
CH2=CHCH2CH2Cl
D
CH2=C(Br)CH3

What is the secondary valency of Cobalt in Co(en)2Cl2+?

A
2
B
4
C
8
D
6

When Benzene diazonium chloride reacts with phenol, it forms a dye. This reaction is called

A
Condensation reaction
B
Diazotisation reaction
C
Acetylation reaction
D
Coupling reaction

The slope in the plot of [R] vs. time for a zero order reaction is

A
+k
B
+k/2.303
C
-k
D
-k/2.303

Proteins are polymers of

A
Amino acids
B
Amines
C
Nucleic acids
D
Monosaccharides

Retention of configuration is observed in

A
SN1 reaction
B
SN2 reaction
C
Neither SN1 nor SN2 reaction
D
SN2 reaction as well as SN1 reaction

An azeotropic mixture of two liquids will have a boiling point lower than either of the two liquids when it

A
forms an ideal solution
B
shows a positive deviation from Raoult's law
C
is saturated
D
shows a negative deviation from Raoult's law

Which of the following does not give Cannizaro reaction?

A
Benzaldehyde
B
Isobutyraldehyde
C
Formaldehyde
D
Trimethylacetaldehyde

Aldehydes and ketones react with hydroxylamine to form

A
Hydrazone
B
Cyanohydrin
C
Semicarbazone
D
Oxime

For the reaction 2A -> 3B, the reaction rate -d[A]/dt is equal to

A
+1/3 d[B]/dt
B
+2/3 d[B]/dt
C
+1/2 d[B]/dt
D
+3/2 d[B]/dt

Auto oxidation of chloroform in air and sunlight produces a poisonous gas known as

A
Tear gas
B
Chlorine gas
C
Mustard gas
D
Phosgene gas

Which of the following ligands is an ambidentate ligand?

A
H2O
B
NH3
C
NO2
D
CO

Among the following, which has the highest value of pKb?

A
Benzene ring with an attached -CH2-NH2 group
B
Benzene ring with an attached -CH3 and -NH2 group
C
Benzene ring with an attached -NH2 group
D
Benzene ring with an attached -NO2 and -NH2 group

The slope in the plot of log[R]0/[R] vs. time for a first order reaction is

A
-k
B
+k
C
-k/2.303
D
+k/2.303

When D-glucose reacts with HI, it forms

A
Iodohexane
B
Gluconic acid
C
Saccharic acid
D
n-hexane

Inversion of configuration occurs in

A
SN1 reaction
B
Neither SN2 nor SN1 reaction
C
SN1 as well as SN2 reaction
D
SN2 reaction

Solubility of gas in liquid decreases with increase in

A
Pressure
B
Number of solute molecules
C
Temperature
D
Volume

Which of the following relations is incorrect?

A
R = (1/k)(l/a)
B
G = k(a/l)
C
G = k(l/a)
D
Λm = k/c

The reagent that can be used to distinguish acetophenone and benzophenone is

A
2,4-dinitrophenyl hydrazine
B
Fehling solution
C
aqueous NaHSO3
D
I2 and NaOH

Which of the following compounds will undergo self-condensation in the presence of dilute NaOH solution?

A
C6H5CHO
B
CH3CH2CHO
C
H-CHO
D
(CH3)3C-CHO

For the reaction 3A -> 2B, the reaction rate -d[A]/dt is equal to

A
+1/3 d[B]/dt
B
+1/2 d[B]/dt
C
+3/2 d[B]/dt
D
+2/3 d[B]/dt