List of top Questions asked in AP EAPCET- 2026

The correct IUPAC names of the compounds X and Y given below are respectively

Atoms of element B form hcp lattice and atoms of element A occupy \(\frac{2}{3}\) of tetrahedral voids. The formula of the compound formed by the elements A and B is

\(\Delta G^\circ\) (in kJ mol\(^{-1}\)) for the cell reaction given below is \[ 2Al(s)+3Cu^{2+}(aq)\rightarrow 2Al^{3+}(aq)+3Cu(s) \] \[ \text{Given: }E^\circ_{Al^{3+}/Al}=-1.66V,\quad E^\circ_{Cu^{2+}/Cu}=+0.34V,\quad F=96500\;C\,mol^{-1} \]

Molten \(Al_2O_3\) was electrolyzed between carbon electrodes. The mass (in g) of aluminium produced at cathode when 965 amperes current is passed through it for 1000 seconds is (\(F=96500\,C\,mol^{-1}\))

Which of the following radical initiates the chain reaction responsible for depletion of ozone layer?

When lithium nitrate and calcium nitrate are heated in separate test tubes, which of the following observations would be identical for both?

A mixture (X) contains two liquids with large difference in their boiling points. Another mixture (Y) contains two liquids with not much difference in their boiling points. Mixtures X and Y can be separated respectively by the methods

What are X and Y in the following set of reactions respectively? \[ \text{I.}\quad \text{2-Methylpropene} \xrightarrow[\ ]{H_2O/H^+} X \] \[ \text{II.}\quad \text{2-Methylpropene} \xrightarrow[\ ]{KMnO_4} Y \]

In which of the following boron and boron related substances are not correctly matched with the application shown against it?

The number of amphoteric oxides in the following is \[ CO_2,\ GeO_2,\ SnO_2,\ PbO_2,\ CO,\ GeO,\ SnO,\ PbO \]

Observe the following reaction \[ A(g) + B(g) \rightleftharpoons C(g) + D(g) \] In a \(1\,L\) closed flask, \(2\) moles of \(A(g)\) and \(1\) mole of \(B(g)\) were taken and heated to temperature \(T(K)\). At equilibrium, the concentration of \(C(g)\) is thrice the concentration of \(B(g)\). What is the value of \(K_c\)?

The dissociation constants of \(H_2A\) are \[ K_{a1}=6\times10^{-2} \quad \text{and} \quad K_{a2}=6\times10^{-5} \] respectively. At equilibrium, \[ [A^{2-}] = [H_2A] \] What is the approximate concentration of \(H^+\) at equilibrium?

The interstitial hydrides of which set of metals have same lattice as that of the parent metals?

Identify the correct statements from the following:

• Bomb calorimeter is used to determine the heat absorbed by water in a chemical reaction at constant volume

• Heat capacity is an extensive property

• The units of entropy are \(J\,K^{-1}\)
The correct answer is

Match the following \[ \begin{array}{|c|c|} \hline \text{List-I} & \text{List-II} \\ \hline \text{A. Co, Ni} & \text{I. Electronegativity} \\ \text{B. K, Ba} & \text{II. Electron gain enthalpy} \\ \text{C. N, Cl} & \text{III. Metallic radius} \\ \text{D. Ar, Kr} & \text{IV. Standard reduction potential (-ve)} \\ \hline \end{array} \] The correct answer is

The work function of Mg, Cu, Ag, Li are \(3.7, 4.8, 4.3, 2.5\,\text{eV}\) respectively. A wavelength of \(300\,\text{nm}\) light is shined on them. The metals which undergo photoelectric effect are

Combustion of methane gives \(CO_2(g)\) and \(H_2O(l)\). What is enthalpy of combustion \((\Delta_c H^\circ \text{ in kJ mol}^{-1})\) of \(CH_4(g)\) at \(298\,K\)?
\[ (\Delta_f H^\circ(CH_4(g)) = -x\,\text{kJ mol}^{-1},\; \Delta_f H^\circ(CO_2(g)) = -y\,\text{kJ mol}^{-1},\; \Delta_f H^\circ(H_2O(l)) = -z\,\text{kJ mol}^{-1}) \]

At \(T(K)\), the rms velocity of an ideal gas is \(x\,\text{m s}^{-1}\). At what temperature (in K), the rms velocity becomes \(3x\,\text{m s}^{-1}\)?

How many of the following molecules are linear with no lone pairs of electrons on the central atom?
\[ \text{BeCl}_2,\ \text{O}_3,\ \text{SCl}_2,\ \text{XeF}_2,\ \text{SnCl}_2,\ \text{PbCl}_2,\ \text{HgCl}_2 \]

Following is the structural representation of \(N_2O_3\) molecule in which \(x, y, z\) are bond angles and \(p, q, r\) are bond lengths. The correct orders of bond angles and bond lengths respectively are center

center

5.4 g of a metal (M) reacts with chlorine to form \(26.7\,\text{g}\) of metal chloride. What is the weight (in g) of M that reacts with \(48\,\text{g}\) of oxygen?

A carrier wave of frequency \(2\,MHz\) and peak voltage \(15\,V\) is used to modulate a message signal of frequency \(20\,kHz\) and peak voltage \(8\,V\). The frequencies of side bands produced are

The half-life of a certain radio isotope is \(4\) minutes. The number of radioactive nuclei at a given instant is \(10^6\). Then the number of radioactive nuclei left \(2\) minutes later would be

A ball has a mass of \(50\,\text{g}\) and a speed of \(50\,\text{m s}^{-1}\). If the speed is measured within an accuracy of \(2\%\), then the uncertainty in its position (in m) is
\[ (h = 6.626 \times 10^{-34}\,\text{J s}, \ \pi = 3.14) \]

Light of wavelength \(1000\AA\) incidents on a metal surface of work function \(6\,eV\). The maximum kinetic energy of photoelectrons is