List of top Chemistry Questions

The decreasing order of priority for the following functional groups in the IUPAC Nomenclature is: –SO\textsubscript{3}H, –CN, –COOH, –OH, –CHO
Statement I: Boron does not exhibit allotropy
Statement II: Boron is extremely hard and black coloured solid
Which of the following statement(s) is/are correct?
Arrange the following free radicals in the correct order of their stability:
Which of the following is not correct?
The given unit cell belongs to the type:
The given unit cell belongs
What are x, y and z respectively in the following reaction?
\[ x \text{Fe}^{2+} (aq) + y \text{H}^{+} (aq) + z \text{Cr}_2\text{O}_7^{2-} (aq) \rightarrow \frac{y}{2} \text{H}_2\text{O} (l) + x \text{Fe}^{3+} (aq) + 2z \text{Cr}^{3+} (aq) \]
One mole H\textsubscript{2O(g) and one mole CO(g) are taken in 1L flask and heated to 725K. At equilibrium, 40\% (by mass) of water reacted with CO(g) as follows:} \[ \text{H}_2\text{O(g)} + \text{CO(g)} \rightleftharpoons \text{H}_2\text{(g)} + \text{CO}_2\text{(g)} \] Its $K_c$ value is
Given below are two statements
Statement I: The changes in pH with temperature are so small that we often ignore it
Statement II: When the hydrogen ion concentration changes by a factor of 100, the pH changes by one unit
In the light of above statements, identify the correct answer from the options given below
If the enthalpy and entropy change for a reaction at 298 K are -145 kJ mol$^{-1}$ and -650 J K$^{-1}$ mol$^{-1}$ respectively, which one of the following statements is correct?
At 300 K, the following graph is obtained for one mole of an ideal gas. If its pressure is 10 atm, then its volume (in L) will be
The following methods can not be used to remove permanent hardness of water:
11.0 L of an ideal gas at constant external pressure of 5 atm is compressed isothermally to a final volume of one liter. The heat absorbed and work done respectively, during this compression (in L atm) are
At T (K), an ideal gas (Z) present in V L flask exerted a pressure of 16.4 atm. Its concentration is 1 mol L$^{-1}$. What is the value of T in K?
The correct order of bond enthalpy of given molecules is
The number of bond pairs of electrons and total number of lone pairs of electrons in XeOF$_4$ are respectively
Which of the following statements are correct?
The correct order of electron gain enthalpy of N, O, Cl, Al is.
Maximum number of electrons theoretically possible for an orbit with principal quantum number n = 6 in an atom is.
Identify the region of spectral lines of electromagnetic spectrum, when electron transition takes place from higher energy levels to n = 3, 4, 5 in atomic spectrum of hydrogen.
Identify the major product of the following reaction:
3-bromo benzoic acid
In the given reactions, 'X' and 'Y' respectively are: \[ \ce{C6H5CH2NH2 ⇔[X] C6H5CONH2 ⇒[Y] C6H5NH2} \]
Addison’s disease is characterized by A. Hyperglycemia B. Weakness C. Increased susceptibility to stress D. Hypertension
What are 'X' and 'Y' respectively in the following reaction sequence? \[ \ce{C6H5CH3→[X] C6H5CO2H →[Y] C6H5CH2OH} \]
What is the major product formed when p-cresol is heated with zinc dust?