List of top Questions asked in AP EAPCET

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

The signs of $\Delta H^\circ$ and $\Delta S^\circ$ for a reaction to be spontaneous at all temperatures respectively are

The conjugate base of phosphorus acid is $ x $. The conjugate base of oleum is $ y $. What are $ x $ and $ y $, respectively?

At temperature $ T(K) $, the equilibrium constant $ K_c $ for the reaction: $$ \mathrm{AO_2(g) + BO_2(g) \rightleftharpoons AO_3(g) + BO(g)} $$ is 16. In a 1 L flask, one mole each of $\mathrm{AO_2}$, $\mathrm{BO_2}$, $\mathrm{AO_3}$, and $\mathrm{BO}$ are taken and heated to $ T(K) $. Identify the correct statements:

• Total number of moles at equilibrium is 4
• At equilibrium, the ratio of moles of $\mathrm{AO_2}$ and $\mathrm{AO_3}$ is 1:4
• Total number of moles of $\mathrm{AO_2}$ and $\mathrm{BO_2}$ at equilibrium is 0.8

Identify the hydride which is not correctly matched with the example given in brackets.

In Solvay process, $\mathrm{NH_3}$ is recovered when the solution containing $\mathrm{NH_4Cl}$ is treated with compound ‘X’. What is ‘X’?

Which of the following reactions give $\mathrm{H_2}$ as one of the products? (Reactions are not balanced.)

• $\mathrm{NaBH_4 + I_2}$
• $\mathrm{B_2H_6 + N(CH_3)_3}$
• $\mathrm{Al + NaOH + H_2O}$
• $\mathrm{BF_3 + NaH}$

Among the ions Mg$^{2+}$, O$^{2-}$, Al$^{3+}$, F$^{-}$, Na$^{+}$, and N$^{3-}$, the ion with the largest size and the ion with the smallest size are respectively

The correct order of increasing bond lengths of C--H, O--H, C--C, and H--H is

The sum of the bond orders of O$_2^+$, O$_2^-$, O$_2$, O$_2^{2-$, and the sum of the unpaired electrons in them respectively are

2.0 g of H$_2$ diffuses through a porous container in 10 minutes. How many grams of O$_2$ will diffuse from the same container in the same time under identical conditions?

At T(K), the $v_{\text{rms}$ of CO$_2$ is 412 m/s$^{-1}$. What is its kinetic energy (in kJ mol$^{-1}$) at the same temperature? (CO$_2$ = 44 u)

100 mL of aqueous solution of 0.05 M Cu$^{2+}$ is added to 1 L of 0.1 M KI solution. The resultant solution was titrated with 0.1 M Na$_2$S$_2$O$_3$ solution using starch indicator until blue color disappeared. What is the volume (in mL) of Na$_2$S$_2$O$_3$ used?

The minimum wavelength of X-rays produced by 20 keV electrons is nearly

If the half-life of a radioactive material is 10 years, then the percentage of the material decayed in 30 years is

At absolute zero temperature, an intrinsic semiconductor behaves as

The work function of Cu is 7.66 $\times 10^{-19}$ J. If photons of wavelength 221 nm are made to strike the surface (h = 6.63 $\times 10^{-34}$ Js), the kinetic energy (in J) of the ejected electrons will be

In a solenoid, if the current of 15 A passes through the solenoid of length 25 cm, radius 2 cm, and number of turns 500, then the magnetic moment of the solenoid is

The maximum magnetic field produced by a current of 12 A passing through a copper wire of diameter 1.2 mm is

Two moving coil galvanometers A and B having identical springs are placed in magnetic fields of 0.25 T and 0.5 T respectively. If the number of turns in A and B are 36 and 48, the areas of the coils A and B are 2.4 $\times 10^{-3}$ m$^2$ and 4.8 $\times 10^{-3}$ m$^2$ respectively, then the ratio of the current sensitivities of the galvanometers A and B is

The self-inductance of an air-cored solenoid of length 40 cm, diameter 7 cm having 200 turns is

A coil of inductive reactance $\frac{1}{\sqrt{3}} \Omega$ and a resistance 1 $\Omega$ are connected in series to a 200 V, 50 Hz ac source. The time lag between voltage and current is

If the magnetic field in a plane progressive wave is represented by the equation $B = 2 \times 10^{-8} \sin (0.5 \times 10^3 t + 1.5 \times 10^4 x)$ T, then the frequency of the wave is

When photons of energy 8 $\times 10^{-19}$ J incident on a photosensitive material, the work function of the photosensitive material is nearly 10 eV, then the maximum kinetic energy of the photoelectrons emitted is
(1) 3.5 eV
(2) 2.5 eV
(3) 2.0 eV
(4) 1.0 eV