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CBSE CLASS XII
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Chemistry
List of top Chemistry Questions asked in CBSE CLASS XII
State Henry's law. Why are aquatic species more comfortable in cold water as compared to warm water?
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Physical Chemistry
Assertion (A):
Phenol is strongly acidic as compared to ethanol.
Reason (R):
Phenoxide ion is more stable than ethoxide ion.
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Organic Chemistry
Differentiate between:
(i) Double salt and Complex compound
(ii) Didentate ligand and Ambidentate ligand
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Coordination chemistry
Write IUPAC names of the following coordination compounds:
\([ \text{CoCl}_2(\text{en})_2]\text{SO}_4 \)
(ii) \( \text{K}_3[\text{Fe}(\text{C}_2\text{O}_4)_3] \)
(ii) Didentate ligand and Ambidentate ligand
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Coordination chemistry
Observe the graph in the given figure and answer the following questions:
(a) Predict the order of reaction.
(b) What is the slope of the curve?
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Chemical Kinetics
Draw the structures of major monohalo products in each of the following reactions:
\( \text{CH}_3\text{C}_6\text{H}_5 + \text{HI} \longrightarrow \) ?
(b) \( \text{C}_6\text{H}_6 + \text{Br}_2 \longrightarrow \) Heat or UV light ?
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Organic Chemistry
How do you explain the following?
(a) Presence of an aldehyde group in glucose.
(b) Presence of five –OH groups in glucose.
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Organic Chemistry
Which of the following cell converts the energy of combustion of fuel into electrical energy?
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Electrochemistry
Assertion (A):
Hydrolysis of an ester follows first order kinetics.
Reason (R):
The concentration of water does not get altered much during the reaction.
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Organic Chemistry
Assertion (A):
Boiling point of (CH₃)₃N is higher than that of CH₃CH₂CH₂NH₂.
Reason (R):
Hydrogen bonding is more extensive in CH₃CH₂CH₂NH₂.
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Organic Chemistry
The unit of rate and rate constant are the same for a:
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Chemical Kinetics
Assertion (A):
Actinoids show wide range of oxidation states.
Reason (R):
Actinoids are radioactive in nature.
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Chemical Kinetics
Pyranose ring of glucose is formed due to the reaction between:
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Organic Chemistry
Which of the following complex ions is not optically active?
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Coordination chemistry
Which of the following is the softest metal?
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Physical Properties of Metals
The freezing point of one molal KCl solution, assuming KCl to be completely dissociated in water, is: (\(K_f\) for water = 1.86 K kg mol\(^{-1}\))
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Colligative Properties
A solution of acetone in ethanol:
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Colligative Properties
According to Werner’s theory of coordination compounds:
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Coordination chemistry
Which one of the following amines gives an alcohol on reaction with HNO₂?
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Organic Chemistry
In the Hinsberg method for separation of primary, secondary, and tertiary amines, the reagent used is:
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Organic Chemistry
Which of the following compounds would be hydrolyzed by aqueous KOH most easily?
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Organic Chemistry
Williamson synthesis of preparing unsymmetrical ether is:
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Organic Chemistry
According to the generally accepted definition of the ideal solution there are equal interaction forces acting between molecules belonging to the same or different species. (This is equivalent to the statement that the activity of the components equals the concentration.) Strictly speaking, this concept is valid in ecological systems (isotopic mixtures of an element, hydrocarbons mixtures, etc.). It is still usual to talk about ideal solutions as limiting cases in reality since very dilute solutions behave ideally with respect to the solvent. This law is further supported by the fact that Raoult’s law empirically found for describing the behaviour of the solvent in dilute solutions can be deduced thermodynamically via the assumption of ideal behaviour of the solvent.
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Physical Chemistry
Ribose and 2-deoxyribose have an important role in biology. Among the most important derivatives are those with phosphate groups attached at the 5 position. Mono-, di- and tri-phosphate forms are important, as well as 3-5 cyclic monophosphates. Purines and pyrimidines form an important class of compounds with ribose and deoxyribose. When these purine and pyrimidine derivatives are coupled to a ribose sugar, they are called nucleosides.
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Biochemistry
Reactant ‘A’ underwent a decomposition reaction. The concentration of ‘A’ was measured periodically and recorded in the table given below:
Time (Hours)
[A] (M)
0
0.40
1
0.20
2
0.10
3
0.05
Based on the above data, predict the order of the reaction and write the expression for the rate law.
CBSE CLASS XII - 2025
CBSE CLASS XII
Chemistry
Chemical Kinetics
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