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Explore Class 12 Chemistry past and model questions by chapter, year, marks and question type.
440 questions found
State Hess’s law of constant heat summation and illustrate it with an example.
Boiled with water?
Which of the following mechanisms can occur in the hydrolysis of isopropyl chloride?
SN¹ Mechanism
SN² Mechanism
SN¹ and SN² Mechanism
Neither SN¹ nor SN² Mechanism
A compound 'X' undergoes reduction with LiAlH₄ to yield 'Y'. When 'Y' is passed over copper heated to 300°C, 'X' is formed. What is 'Y'?
Acetone
Ethanal
Ethanol
Ethoxyethane
You are given (I) aniline, (II) o-nitroaniline, (III) p-nitroaniline and (IV) m-nitroaniline. What is the order of increasing basic nature?
II < I < III < IV
I < II < III < IV
II < III < I < IV
II < III < IV < I
Write any two differences between primary standard and secondary standard substance.
What is the normality of 5% Na₂CO₃ solution?
0.94 N
0.98 N
0.99 N
1.01 N
Which of the following is the purest form of iron?
Cast iron
Steel
Haematite
Wrought iron
Nitrobenzene can be prepared from benzene by using a mixture of conc. nitric acid and conc. H₂SO₄ in the nitrating mixture. What is the role of nitric acid?
A base
An acid
A catalyst
A reducing agent
Determine the normality of the acid.
A list of organic compounds is given as follows:
Propanamine, ethoxyethane, ethyl cyanide, iodoethane and ethanol.
Prepare a correct sequence of reaction chain from the above compounds using suitable reagents and conditions.
Derive Ostwald’s dilution equation.
Which of the following is the maximum possible oxidation state of the transition metals in the 3d series?
+3
+6
+7
+8
Standard reduction potential values for P, Q, R and S are +0.34 V, -0.76 V, +0.0 V and -3.05 V, respectively. What is the correct order of their reducing power?
P > R > Q > S
S > R > Q > P
Q > P > S > R
S > Q > R > P
What is rusting? Describe the electrochemical theory of the rusting of iron. List any two methods for the prevention of rusting
The half-life of a certain reaction is 50 seconds, and it remains constant even if the initial concentration of the reaction is doubled. What is the order of the reaction?
Zero-order reaction
First-order reaction
Second-order reaction
Pseudo-first order reaction
To estimate the chloride ion present in tap water, volumetric analysis has been commonly used in the laboratory. Which of the following solutions can be used for the above mentioned titration?
BaCl2
NaOH
KCrO
AgNO
Wurtz-Fitting reaction
Construct the galvanic cell notation for the given electrodes, indicating the anode and cathode.
Calculate the normality of KMnO4 from the above data.