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1,589 Questions
CBSE
#1 Class Class 12 Chemistry Coordination Compounds 2026 Short 2M
(i) Give a chemical test to show that $[Co(NH_3)_5SO_4]Cl$ and $[Co(NH_3)_5Cl]SO_4$ are ionisation isomers.
(ii) What is meant by the 'Chelate effect' ? Give an example.

[This is the internal-choice (OR) alternative of Question 19.]
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CBSE
#2 Class Class 12 Chemistry Coordination Compounds 2026 Short 2M
Write IUPAC names of the following coordination compounds :
(i) $[Ag(NH_3)_2][Ag(CN)_2]$
(ii) $K_3[Fe(C_2O_4)_3]$
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CBSE
#3 Class Class 12 Chemistry Haloalkanes and Haloarenes 2026 Short 2M
Why are haloarenes less reactive towards nucleophilic substitution reaction ? Give two reasons.
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CBSE
#4 Class Class 12 Chemistry Solutions 2026 Short 2M
What type of deviation from Raoult's law is shown by a mixture of phenol and aniline ? Give reason.
What will happen to the boiling point of the solution on mixing phenol and aniline ?
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CBSE
#5 Class Class 12 Chemistry Biomolecules 2026 Long 1M
Assertion (A) : The pentaacetate of glucose does not react with $H_2N-OH$.
Reason (R) : It indicates the presence of free $-CHO$ group in glucose.

Codes: (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A). (C) Assertion (A) is true, but Reason (R) is false. (D) Assertion (A) is false, but Reason (R) is true.
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CBSE
#6 Class Class 12 Chemistry The d- and f-Block Elements 2026 Long 1M
Assertion (A) : Actinoids show wide range of oxidation states.
Reason (R) : Actinoids are radioactive in nature.

Codes: (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A). (C) Assertion (A) is true, but Reason (R) is false. (D) Assertion (A) is false, but Reason (R) is true.
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CBSE
#7 Class Class 12 Chemistry Alcohols, Phenols and Ethers 2026 Long 1M
Assertion (A) : The presence of $-OH$ group in phenols directs the incoming group to meta position in the ring.
Reason (R) : $-OH$ group in phenols activates the aromatic ring towards electrophilic substitution reaction.

Codes: (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A). (C) Assertion (A) is true, but Reason (R) is false. (D) Assertion (A) is false, but Reason (R) is true.
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CBSE
#8 Class Class 12 Chemistry Solutions 2026 Long 1M
Assertion (A) : It is not possible to separate the components of an azeotrope by fractional distillation.
Reason (R) : Components of an azeotrope have the same composition in liquid and vapour phase and boil at a constant temperature.

Codes: (A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A). (B) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A). (C) Assertion (A) is true, but Reason (R) is false. (D) Assertion (A) is false, but Reason (R) is true.
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CBSE
#9 Class Class 12 Chemistry Biomolecules 2026 Mcq 1M
The deficiency of which of the following vitamins causes increased fragility of red blood cells and muscular weakness :
A. Vitamin A
B. Vitamin K
C. Vitamin E
D. Vitamin D
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CBSE
#10 Class Class 12 Chemistry Amines 2026 Mcq 1M
Which of the following amines has lowest $pK_b$ value ?
A. $C_6H_5 - N(CH_3)_2$
B. $C_6H_5 - NH(CH_3)$
C. $C_6H_5 - NH_2$
D. $O_2N-C_6H_4-NH_2$ (p-nitroaniline)
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CBSE
#11 Class Class 12 Chemistry Amines 2026 Mcq 1M
Aniline on direct nitration yields
A. 51%-ortho, 47%-para, 2%-meta derivatives
B. 51%-meta, 47%-ortho, 2%-para derivatives
C. 51%-para, 47%-meta, 2%-ortho derivatives
D. 51%-ortho, 47%-meta, 2%-para derivatives
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CBSE
#12 Class Class 12 Chemistry Haloalkanes and Haloarenes 2026 Mcq 1M
Which of the following is 'not' true about enantiomers ?
A. They have the same chemical reactivity.
B. They have the same specific rotation.
C. They have the same melting or boiling point.
D. They have the same refractive index.
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CBSE
#13 Class Class 12 Chemistry Alcohols, Phenols and Ethers 2026 Mcq 1M
At low temperature, phenol reacts with dil. $HNO_3$ to yield
A. 2, 4, 6-Trinitrophenol
B. o-Nitrophenol only
C. p-Nitrophenol only
D. ortho- and para-nitrophenol
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CBSE
#14 Class Class 12 Chemistry Coordination Compounds 2026 Mcq 1M
The secondary valency of Co in the complex $[Co(NH_3)_5(NO_2)]^{2+}$ is
A. 5
B. 1
C. 4
D. 6
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CBSE
#15 Class Class 12 Chemistry Alcohols, Phenols and Ethers 2026 Mcq 1M
Aspirin is obtained by acetylation of
A. Phenol
B. Salicylaldehyde
C. 2-Hydroxybenzoic acid
D. Benzoic acid
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CBSE
#16 Class Class 12 Chemistry Electrochemistry 2026 Mcq 1M
What will happen during the electrolysis of aqueous solution of $CuCl_2$ by using platinum electrodes ?
A. Cu will deposit at Anode
B. $H_2$ gas will be released at cathode
C. $O_2$ gas will be released at anode
D. $Cl_2$ gas will be released at anode
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CBSE
#17 Class Class 12 Chemistry Chemical Kinetics 2026 Mcq 1M
Which of the following represents the fraction of molecules with energies equal to or greater than $E_a$ ?
A. $+\frac{E_a}{RT}$
B. $e^{-E_a/RT}$
C. $-\frac{E_a}{RT}$
D. $e^{+E_a/RT}$
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CBSE
#18 Class Class 12 Chemistry The d- and f-Block Elements 2026 Mcq 1M
Which of the following is not a transition metal ?
A. Sc
B. Ag
C. Hg
D. Cu
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CBSE
#19 Class Class 12 Chemistry Solutions 2026 Mcq 1M
Which of the following solutions will have the lowest freezing point in water ?
A. 0.1 M Glucose
B. 0.1 M $CaCl_2$
C. 0.1 M $KCl$
D. 0.1 M Urea
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CBSE
#20 Class Class 12 Chemistry Chemical Kinetics 2026 Mcq 1M
Which of the following curve represents the first order reaction ?
A. Graph of $t_{1/2}$ versus $[R]_0$ : a straight line passing through the origin (i.e. $t_{1/2}$ increases with $[R]_0$)
B. Graph of $t_{1/2}$ versus $[R]_0$ : a horizontal straight line (i.e. $t_{1/2}$ is independent of $[R]_0$)
C. Graph of Rate versus Concentration : a horizontal straight line (i.e. rate is independent of concentration)
D. Graph of Rate versus Concentration : a curve falling steeply as concentration increases
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