List of top Chemistry Questions

For the reaction 2A⇋ B + C, KC = 4 × 10–3 . At a given time, the composition of reaction mixture is: [A] = [B] = [C] = 2 × 10–3 M. Then, which of the following is correct?
Match List I with List II

List-I
(Reaction)

List-II 
(Reagents/Condition)

(A)
Match Reaction with the correct Reagents/Condition
(I)Match Reaction with the correct Reagents/Condition
(B)Match Reaction with the correct Reagents/Condition(II)CrO3
(C)Match Reaction with the correct Reagents/Condition(III)KMnO4/KOH, \(\Delta\)
(D)Match Reaction with the correct Reagents/Condition(IV)(i) O3
(ii) Zn-H2O

Choose the correct answer from the options given below:
On heating, some solid substances change from solid to vapour state without passing through liquid state. The technique used for the purification of such solid substances based on the above principle is known as
Given below are two statements:
Statement I: Both [Co(NH3)6]3+ and [CoF6]3- complexes are octahedral but differ in their magnetic behaviour.
Statement II: [Co(NH3)6]3+ is diamagnetic whereas [CoF6]3- is paramagnetic.
In the light of the above statements, choose the correct answer from the options given below:
Match List I with List II

List-I
(Process)

List-II 
(Conditions)

(A)Isothermal process(I)No heat exchange
(B)Isochoric process(II)Carried out at constant temperature
(C)Isobaric process(III)Carried out at constant volume
(D)Adiabatic process(IV)Carried out at constant pressure

Choose the correct answer from the options given below:
Fehling’s solution ‘A’ is
A compound with a molecular formula of C6H14 has two tertiary carbons. Its IUPAC name is:
In which of the following equilibria, Kp and Ke are NOT equal?
Identify the correct reagents that would bring about the following transformation.
correct reagents that would bring about the following transformation. correct reagents that would bring about the following transformation.
The reagents with which glucose does not react to give the corresponding tests/products are
A. Tollen's reagent
B. Schiff's reagent
C. HCN
D NH2OH
E. NaHSO3
Choose the correct options from the given below:
The E° value for the Mn3+/Mn2+ couple is more positive than that of Cr3+/Cr2+ or Fe3+/Fe2+ due to change of
Among Group 16 elements, which one does NOT show -2 oxidation state?
The highest number of helium atoms is in
Spin only magnetic moment is same for which of the following ions?
A. T3+
B. Cr2+
C. Mn2+
D. Fe2+
E. Se3+
Choose the most appropriate answer from the options given below
Match List I with List II

List-I
(Quantum Number)

List-II 
(Information provided)

(A)mI(I)Shape of orbital
(B)ms(II)Size of orbital
(C)I(III)Orientation of orbital
(D)n(IV)Orientation of spin of electron

Choose the correct answer from the options given below:
Which reaction is NOT a redox reaction?
In which of the following processes entropy increases?
A. A liquid evaporates to vapour.
B. Temperature of a crystalline solid lowered from 130 K to 0 K.
C. 2NaHCO3(s) → Na2CO3(s)+CO2(g)+H2O(g)
D. Cl2(g) → 2Cl(g)
Choose the correct answer from the options given below:
The energy of an electron in the ground state (n=1) for He+ ion is -xJ, then that for an electron in n=2 state for Be3+ ion in J is:
Which plot of ln k vs \(\frac{1}{T}\) is consistent with Arrhenius equation?
Match List I with List II

List-I
(Compound)

List-II
(Shape/geometry)

(A)NH3(I)Trigonal Pyramidal
(B)BrF5(II)Square Planar
(C)XeF4(III)Octahedral
(D)SF6(IV)Square Pyramidal

Choose the correct answer from the options given below:
Match List I with List II

List-I
(Complex)

List-II
(Type of isomerism)

(A)[Co(NH3)5(NO2)]Cl2(I)Solvate isomerism
(B)[Co(NH3)5(SO4)]Br(II)Linkage isomerism
(C)[Co(NH3)6] [Cr(CN)6](III)Ionization isomerism
(D)[Co(H2O)6]Cl3(IV)Coordination isomerism

Choose the correct answer from the options given below:
Match List I with List II

List-I
(Conversion)

List-II 
(Shape/geometry)

(A)1 mol of H2O to O2(I)3F
(B)1 mol of MnO-4 to Mn2+(II)2F
(C)1.5 mol of Ca from molten CaCl2(III)1F
(D)1 mol of FeO to Fe2O3(IV)5F

Choose the correct answer from the options given below:
Arrange the following elements in increasing order of electronegativity:
N, O, F, C, Si
Choose the correct answer from the options given below:
Given below are two statements:
Statement I: Aniline does not undergo Friedel-Crafts alkylation reaction.
Statement II: Aniline cannot be prepared through Gabriel synthesis.
In the light of the above statements, choose the correct answer from the options given below
Activation energy of any chemical reaction can be calculated if one knows the value of