List of top Questions asked in AP EAPCET- 2026

Consider the following statements:
Statement - I: In three dimensional network of \(SiO_2\), if few Si atoms are replaced by Al atoms, the resulting structure acquires a positive charge.
Statement - II: Silicones are organo - silicon polymers which have \((R_2SiO)\) as a repeating unit.

Which of the following is not correct about the hexagonal close packing?

Given below are two statements:
Statement - I: London forces between two particles are proportional to \(r^{-6}\), where 'r' is the distance between two particles.
Statement - II: The dipole-dipole interaction energy in a solid is proportional to \(r^{-3}\) where r is the distance between two polar molecules.

The resistance of a conductivity cell filled with 0.02 M KCl solution is 85 \(\Omega\) at \(25^{\circ}C\). Conductivity of this solution is \(0.3 \text{ S m}^{-1}\). Resistance of 0.0025 M \(K_2SO_4\) solution taken in the same cell is 300 \(\Omega\). The molar conductivity of 0.0025 M \(K_2SO_4\) solution (in S \(\text{m}^2 \text{mol}^{-1}\)) is:

In a flask, 2 g of activated charcoal was added to 100 mL of acetic acid solution of 0.06 N. After 2 hours, the solution was filtered. The concentration of filtrate was found to be 0.04 N. The mass of acetic acid (in mg) adsorbed per gram of charcoal is:

Which of the following colloidal system represents a gel?

Observe the following reactions: I. D-Glucose \(\xrightarrow{NH_2OH}\) II. D-Glucose \(\xrightarrow[(ii) NH_2OH]{(i) (CH_3CO)_2O}\). Correct statement regarding the reactions I and II is:

\(E_{cell}\), for the cell given below is 0.82 V. What is its \(E^{\circ}\) value? \(Fe | Fe^{2+}(0.001 \text{ M}) || Cu^{2+}(0.1 \text{ M}) | Cu\). (Given: \(\frac{2.303 RT}{F} = 0.06 \text{ V}\))

If the energy required to remove an electron from the ground state of \(He^+\) is \(x\) J, the energy (in J) required to remove an electron from the ground state of \(Li^{2+}\) is:

The threshold frequency of a metal is \(1.15 \times 10^{15}\) Hz. If electrons with kinetic energy of \(0.20\) eV are ejected when this metal surface is irradiated with photons of frequency '\(\nu\)', the value of \(\nu\) is (\(h=6.60 \times 10^{-34}\) Js, \(1\) eV \(=1.6 \times 10^{-19}\) J)

Which of the following sets of molecules / ions represent isoelectronic species?

White phosphorus reacts with aqueous NaOH to form \(PH_3(g)\) and sodium hypophosphite. When 6.2g of white phosphorus reacted with 500 mL of xM NaOH solution, the concentration of sodium hypophosphite in the resultant solution was \(0.3 \text{ mol L}^{-1}\). What are x (in M) and weight (in g) of \(PH_3\) formed respectively? (\(P=31\) u; \(H=1\) u; \(O=16\) u)

A solution is prepared by adding 0.5 L of 0.5 M NaOH to 0.5 L of 0.55 M formic acid. What is the pH of the resultant solution? (\(K_a\) of formic acid = \(1.8 \times 10^{-4}\); \(\log(1.8) = 0.26\))

1.5 g of an organic compound was analysed by Kjeldahl's method for estimation of nitrogen. The ammonia liberated was passed into 30 mL of 1N HCl solution. The remaining HCl was further neutralised by 120 mL of N/10 NaOH solution. The percentage of nitrogen in the compound is:

Identify the pair of ions which act as good reducing agents.

What is Y in the given sequence of reactions?

Consider the following statements about sulphur allotropes and identify the incorrect statement.

In which of the following, colloidal system is correctly matched with its example?

In addition to \(-NH_2\) and \(-COOH\) groups, the functional group present in the amino acid serine is X and the functional group present in the amino acid cysteine is Y. X and Y are respectively

Identify the correct statements from the following I) \[ \text{Conjugate base of nitrous acid is } NO_2^{-} \] II) \[ \text{The concentration of } OH^{-} \text{ ions in } 0.1\,M \text{ aqueous pyridine solution is } \sqrt{2}\times10^{-5}\,M \] \[ (K_b \text{ of pyridine }=2\times10^{-9}) \] III) The acid strength of aqueous hydrogen halides follows \[ HF \gt HCl \gt HBr \gt HI \]

From the following list, identify the number of substituents which exert \(+R\) effect when present on benzene ring \[ -Cl,\quad -COCH_3,\quad -NHC_2H_5,\quad -OCH_3,\quad -NHCOCH_3,\quad -COOCH_3 \]

Identify the end product \(Z\) in the given sequence of reactions \[ C_3H_6 \xrightarrow[\left(C_6H_5COO\right)_2]{HBr} X \] \[ X \xrightarrow[\text{Anhy. }AlCl_3]{C_6H_6} Y \] \[ Y \xrightarrow[(iii)\ NaOH/CaO,\Delta]{(i)\ KMnO_4/OH^- \;\; (ii)\ H_3O^+} Z \]

At \(298\,K\), for the reaction \[ N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g) \] \[ \Delta H=-92.4\ \text{kJ} \] and \[ \log K_c=5.75. \] What is the entropy change \((\Delta S)\) (in J K\(^{-1}\)) for this reaction at the same temperature? \[ (R=8.3\ \text{J K}^{-1}\text{mol}^{-1}) \]

\(X\), \(Y\) and \(Z\) are three allotropes of carbon. They are used in black ink, in water filters and as reducing agent in metallurgy respectively. The correct statement about their production is

Correct statements about oxidising smog are I. \[ \text{Primary precursors of it are } O_3,\ PAN \] II. It occurs in warm, dry and sunny climate III. Its formation can be controlled by the use of catalytic converters in automobiles