CBSE 12 Chemistry Question Paper-2023 Set-4 by Pavan | Practice Test to Test Your Knowledge
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  3. CBSE 12 Chemistry Question Paper-2023 Set-4
CBSE 12 Chemistry Question Paper-2023 Set-4

CBSE 12 Chemistry Question Paper-2023 Set-4

This mock test includes actual CBSE Class 12 Chemistry board exam questions from the year 2023 Set-4, helping students understand exam trends and practice real paper format

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

Duration

40 min

Questions

39

Marking

Negative

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Questions Preview

A compound completely forms a tetramer in a given organic solvent. The van 't Hoff factor 'i' is:

A
4.0
B
2.0
C
0.125
D
0.25

For a zero-order reaction, the half-life is equal to which of the following? Where R is the initial concentration.

A
2k/R
B
R/2k
C
R^2/2k
D
1/2(k/R^2)

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

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

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

A
+5
B
0
C
+3
D
+2

Among the following, which is the strongest base?

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

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

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

An a-helix is a structural feature of

A
Sucrose
B
Starch
C
Nucleotides
D
Polypeptides

Racemisation occurs in

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

Value of Henry's constant KH:

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

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

A
0.01 M
B
0.5 M
C
1 M
D
0.1 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
CH3CHO
D
HCHO

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

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

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

A
8
B
4
C
6
D
2

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

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

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

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

Proteins are polymers of

A
Nucleic acids
B
Amino acids
C
Monosaccharides
D
Amines

Retention of configuration is observed in

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

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

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

Which of the following does not give Cannizaro reaction?

A
Formaldehyde
B
Benzaldehyde
C
Isobutyraldehyde
D
Trimethylacetaldehyde

Aldehydes and ketones react with hydroxylamine to form

A
Semicarbazone
B
Cyanohydrin
C
Oxime
D
Hydrazone

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

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

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

Which of the following ligands is an ambidentate ligand?

A
H2O
B
CO
C
NH3
D
NO2

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 -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 log[R]0/[R] vs. time for a first order reaction is

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

When D-glucose reacts with HI, it forms

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

Inversion of configuration occurs in

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

Solubility of gas in liquid decreases with increase in

A
Pressure
B
Temperature
C
Number of solute molecules
D
Volume

Which of the following relations is incorrect?

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

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

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

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

A
H-CHO
B
CH3CH2CHO
C
C6H5CHO
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
+2/3 d[B]/dt
C
+3/2 d[B]/dt
D
+1/2 d[B]/dt

A compound forms a complete dimer in a given organic solvent. The van 't Hoff factor 'i' is:

A
0.5
B
2.0
C
0.25
D
1.0

For a reaction A+2B -> C+D, the rate law is given by r=k[A][B]^2. The concentration of A is kept constant and that of B is doubled. The reaction rate will be:

A
doubled
B
unchanged
C
halved
D
quadrupled

The reaction of 1-phenyl-2-chloropropane with alcoholic KOH mainly yields:

A
1-phenylpropan-3-ol
B
3-phenylpropene
C
1-phenylpropan-2-ol
D
1-phenylpropene

The compound CaCl2.6H2O completely dissociates in water. The van 't Hoff factor 'i' is:

A
9
B
3
C
6
D
4

For a zero-order reaction of the type A -> products, the rate equation can be expressed as:

A
k = ([A]0 - [A])/t
B
k = ([A] - [A]0)/t
C
k = ([A]0 - [A])/2t
D
k = ([A]0 - [A])/2

Which of the following Cu2+ halides is not known?

A
CuF2
B
CuCl2
C
CuI2
D
CuBr2