List of top Questions asked in AP EAPCET- 2025

Nature of two oxides of nitrogen X and Y formed in the reaction of sodium nitrite with hydrochloric acid is
Among the following compounds, which one is not responsible for the depletion of ozone layer?
Match the following pollutant concentration limits in water with their effects:
The correct order of the non-metallic character among the elements B, C, N, F and Si is
How many of the following molecules have two lone pairs of electrons on central atom? SF\(_6\), BF\(_3\), ClF\(_3\), PCl\(_5\), BrF\(_5\), XeF\(_4\), H\(_2\)O, SF\(_4\)
The pair of molecules / ions with the same bond order value is
A molecule has a T-shape. The total number of electron pairs in the valence shell of its central atom is:
Identify the correct statements from the following:
A) Among alkali metal ions, Li⁺ has the highest hydration enthalpy.
B) Boiling point of alkali metals increases from Li to Cs.
C) Density of K is less than that of Na and Rb.
D) Li has strong tendency to form superoxide.
Identify the incorrect statements from the following.
I. For an adiabatic process, \( \Delta U = w_{\text{ad}} \).
II. Enthalpy is an intensive property.
III. For the process \( \text{H}_2\text{O}(\ell) \rightarrow \text{H}_2\text{O}(s) \), the entropy increases.
If $\Delta_r H^{\ominus}$ and $\Delta_r S^{\ominus}$ are standard enthalpy change and standard entropy change respectively for a reaction, the incorrect option is
The C$_p$ of H$_2$O(l) is 75.3 J mol$^{-1}$ K$^{-1}$. What is the energy (in J) required to raise 180 g of liquid water from 10$^{\circ}$C to 15$^{\circ}$C? (H$_2$O = 18 u)
Consider the following equilibrium reaction in gaseous state at T(K): \[ A + 2B \rightleftharpoons 2C + D \] The initial concentration of B is 1.5 times that of A. At equilibrium, the concentrations of A and B are equal. The equilibrium constant for the reaction is:
For one mole of an ideal gas, three isochors were obtained at \(V_1, V_2\) and \(V_3\) respectively. Their slopes are \(m_1, m_2\) and \(m_3\). If \(V_1<V_2<V_3\), then the correct relationship of slopes is:
The standard enthalpy of formation of C\(_2\)H\(_4\)(g), CO\(_2\)(g), and H\(_2\)O(l) are 52, –394, and –286 kJ mol\(^{-1}\) respectively. The heat evolved by burning 7 g of C\(_2\)H\(_4\)(g) is
Consider the following:
Statement-I: Both internal energy (U) and work (w) are state functions.
Statement-II: During the free expansion of an ideal gas into vacuum, the work done is zero.
The correct answer is
At \( T \)(K), hydrogen and oxygen gases are mixed in the ratio of \( 1:2 \) by mass in a closed vessel of volume \( V \) litres. If the total pressure of the gaseous mixture is \( p \) atm, the partial pressure of oxygen (in atm) is:
For one mole of an ideal gas an isochore is obtained. The slope of the isochore is \(0.082 \, \text{atm K}^{-1}\). What will be its pressure (in atm) when the temperature is 12.2 K? (R = \(0.082 \, \text{L atm mol}^{-1} \text{ K}^{-1}\)).
At \( T \)(K), hydrogen and oxygen gases are mixed in the ratio of \( 1:2 \) by mass in a closed vessel of volume \( V \) litres. If the total pressure of the gaseous mixture is \( p \) atm, the partial pressure of oxygen (in atm) is:
The enthalpy change (ΔH) for the reaction N2(g) + 3H2(g) → 2NH3(g) is -92 kJ/mol.

What is the enthalpy change for the decomposition of 1 mol of NH3(g) into its elements?
The enthalpy of formation of \( \text{CO}_2(\text{g}) \) and \( \text{H}_2\text{O}(l) \) are \(-393.5\) and \(-286 \text{ kJ mol}^{-1}\) respectively. If the heat of combustion of \( \text{CH}_3\text{OH}(l) \) is \(-749 \text{ kJ mol}^{-1}\), the enthalpy of formation of \( \text{CH}_3\text{OH}(l) \) \(in \text{kJ mol}^{-1}\) is
Which of the following statements is incorrect about enthalpy?
Identify the correct statements from the following:
I) Work is a path function.
II) Enthalpy is an extensive property.
III) Lattice enthalpy of ionic compounds can be obtained from Born–Haber cycle.
The signs of $\Delta H^\circ$ and $\Delta S^\circ$ for a reaction to be spontaneous at all temperatures respectively are
For one mole of an ideal gas an isochore is obtained. The slope of the isochore is \(0.082 \, \text{atm K}^{-1}\). What will be its pressure (in atm) when the temperature is 12.2 K? (R = \(0.082 \, \text{L atm mol}^{-1} \text{ K}^{-1}\)).
One mole of \( \text{C}_2\text{H}_5\text{OH(l)} \) was completely burnt in oxygen to form \( \text{CO}_2\text{(g)} \) and \( \text{H}_2\text{O(l)} \). The standard enthalpy of formation (\( \Delta_f H^\ominus \)) of \( \text{C}_2\text{H}_5\text{OH(l)} \), \( \text{CO}_2\text{(g)} \) and \( \text{H}_2\text{O(l)} \) is x, y, z kJ mol\(^{-1}\) respectively. What is \( \Delta_r H^\ominus \) (in kJ mol\(^{-1}\)) for this reaction?