List of top Questions asked in AP EAPCET- 2026

Which of the following transition metal complexes is expected to be diamagnetic?

The boiling point of 1M aqueous solution of KCl (85% dissociation) having density \(1.04\ \text{g mL}^{-1}\) is \[ \text{(Given: } K_b(\mathrm{H_2O}) = 0.52\ \mathrm{K\ kg\ mol^{-1}}, \quad \text{Molar mass of KCl} = 74.5\ \mathrm{g\ mol^{-1}} \text{)} \]

The minimum volume of water (in L) required to dissolve 1.5 g of \(CaSO_{4}\) (molar mass = 136 g mol\(^{-1}\)) at 298 K is given that \(K_{sp} = 9 \times 10^{-6}\).

The number of lone pairs on the central atom in ( SF_4 ), ( XeF_4 ), ( CF_4 ), and ( BF_3 ) are respectively:

X, Y, Z are calcium compounds. X is a primary raw material for manufacturing cement. Y is used to recover ammonia in Solvay process and Z is employed for making casts of statues. Identify the incorrect statement from the following:

NaBH$_4$ reacts with I$_2$ and gives a salt and two gases Y, Z. The gas Y is toxic in nature. Z is a combustible gas. The correct statements regarding Y, Z are:

• I. Y with NaH forms a compound which acts as a good reducing agent.

• II. Y on hydrolysis gives a monobasic acid.

• III. Z is used in Haber’s process.

Which of the following statements are correct regarding methods used to remove hardness of water? I. Temporary hardness due to Ca and Mg bicarbonates can be removed by boiling. II. In Clark's process, lime is used to precipitate calcium carbonate. III. Calgon softens water by forming soluble complexes with Ca$^{2+}$ and Mg$^{2+}$.

Which of the following compounds is not correctly matched with the property given?

At a given temperature T in a 10.0 L flask, 2.0 moles of N$_2$O$_4$(g) is heated. At equilibrium, 20% of N$_2$O$_4$(g) dissociates into NO$_2$(g). The value of K$_C$ for the reaction N$_2$O$_4$(g) $\rightleftharpoons$ 2NO$_2$(g) is:

An ideal gas with density (3.0 g L^-1) has a pressure of (684 mm Hg) at (25^C). The rms speed (in m s^-1) of the gas is (1 atm = 10^5 Pa).

At 27^C, 1.6 g of O$_2$ gas at 5 atm expands isothermally against a constant external pressure of 1 atm. The work done (in J) is (1 L-atm = 100 J):

For the reaction, \(2Al_{2}O_{3}(s) \rightarrow 4Al(s) + 3O_{2}(g)\), \(\Delta H = +3340\,\text{kJ}\). What is the enthalpy of formation of \(Al_{2}O_{3}(s)\) (in kJ)?

If the molar masses of Na$_2$S$_2$O$_3$ and I$_2$ are M$_1$ and M$_2$ respectively, then the equivalent weights of Na$_2$S$_2$O$_3$ and I$_2$ in the reaction: \[ 2\,\text{Na}_2\text{S}_2\text{O}_3 + I_2 \rightarrow 2\,\text{NaI} + \text{Na}_2\text{S}_4\text{O}_6 \] are respectively:

Correct increasing order of first ionization enthalpy is: C, O, N, F

In an electromagnetic wave in vacuum, the relation between peak electric field E_0 and magnetic field B_0 is:

For a convex lens, magnifications m_1 and m_2 correspond to object distances u_1 and u_2. The focal length is:

Which species has bond order 2.5 and is paramagnetic?

Volume of 4.4 g CO$_2$ at STP is:

Which quantum number combination is impossible for a hydrogenic atom orbital?

The electric potential at a point on the axis of an electric dipole at a distance r from its center is proportional to:

A wire of resistance R is stretched uniformly to double its original length. The new resistance will be:

The threshold frequency for a certain photosensitive metal surface is _0. When light of frequency 2_0 is incident on the surface, the maximum velocity of the emitted photoelectrons is v_1. If the frequency is increased to 5_0, the maximum velocity becomes v_2. The ratio v_1 : v_2 is:

Doping a semiconductor with a trivalent impurity results in:

Three capacitors of capacitances \(2\,\mu F\), \(3\,\mu F\), and \(6\,\mu F\) are connected in series. The equivalent capacitance is:

In a nuclear reactor, heavy water (D_2O) is used as a moderator. Its main function is to: