List of top Chemistry Questions

Consider the depicted hydrogen (H) in the hydrocarbons given below. The most acidic hydrogen (H) is:

Match the compounds in List-I with the appropriate observations in List-II and choose the correct option.

At 25$^\circ$C, the concentration of H$^+$ ions in $ 1.00 \times 10^{-3} \, \text{M} $ aqueous solution of a weak monobasic acid having acid dissociation constant $ K_a = 4.00 \times 10^{-11} $ is $ X \times 10^{-7} \, \text{M} $. The value of $ X $ is ____. {Use: Ionic product of water $ K_w = 1.00 \times 10^{-14} $ at 25$^\circ$C
The pair(s) of diamagnetic ions is (are):

The correct match of the group reagents in List-I for precipitating the metal ion given in List-II from solutions is:

List-IList-II
(P) Passing H2S in the presence of NH4OH(1) Cu2+
(Q) (NH4)2CO3 in the presence of NH4OH(2) Al3+
(R) NH4OH in the presence of NH4Cl(3) Mn2+
(S) Passing H2S in the presence of dilute HCl(4) Ba2+
(5) Mg2+
One of the products formed from the reaction of permanganate ion with iodide ion in neutral aqueous medium is:

For the reaction sequence given below, the correct statement(s) is (are): 

(In the options, X is any atom other than carbon and hydrogen, and it is different in P, Q, and R.)

Considering ideal gas behavior, the expansion work done (in kJ) when 144 g of water is electrolyzed completely under constant pressure at 300 K is ____. Use: Universal gas constant $ R = 8.3 \, \text{J K}^{-1} \text{mol}^{-1} $; Atomic mass (in amu): H = 1, O = 16

The heating of $ \text{NH}_4\text{NO}_2 $ at 60--70$^\circ$C and $ \text{NH}_4\text{NO}_3 $ at 200--250$^\circ$C is associated with the formation of nitrogen containing compounds X and Y, respectively. X and Y, respectively, are:

The IUPAC name of the following compound is:

The type of oxide formed by the element among Li, Na, Be, Mg, B and Al that has the least atomic radius is:
In the reaction, what is the oxidation state of Mn in the compound MnO\(_2\)?
For the complex \( [Co(NH_3)_6]^{3+} \), what is the oxidation state of Co and the number of unpaired electrons?
What is the electronic configuration for \( [Ni(CN)_4]^{2-} \)?
For the complex ion \(\text{Mn}^{5+}\), what is the electronic configuration?
What is the oxidation state of Mn in the compound MnO\(_4^{2-}\)?
The half-life of a radioactive substance is 5730 years. If carbon-14 decays and only 80% of it remains after a certain period, what is the time elapsed (in years)?
What is the oxidation state of Mn in the given reaction involving MnF\(_3\) and Mn\(_2\)O\(_3\)?
For the given reaction, what is the correct rate law?
\[ \frac{d[A]}{dt} = -6 \frac{d[B]}{dt} = -4 \frac{d[C]}{dt} = 3 \frac{d[D]}{dt} = 4 \frac{d}{dt} \]
Which of the following is the correct relationship in terms of the physical properties of a substance?
The solution of NaCl is prepared with the following concentrations. What is the volume percentage (V/V) of NaCl?
For the given cell reaction \( E_{\text{cell}} = 1.1 \, \text{V} \), what is the equilibrium constant \( K_c \) for the reaction?
What is the relation between \( \Delta G \) and \( E_{\text{cell}} \)?
Which of the following is the correct relation for \( A_m \)?
For a reaction with a rate constant \( k = 10^{-3} \), how long will it take for the reaction to reach 100% completion?