List of top Questions asked in AP EAPCET

The radius of the nucleus of an atom whose mass number is 125 is

The material used in the fabrication of infrared LED's is

In a transistor, when the emitter current changes by 9.85 mA, the collector current changes to 9.5 mA. Then the base current is

Band width of an optical fiber is

Which of the following electron arrangement does not obey Hund’s rule?

The de Broglie wavelength of an electron travelling with 20% of velocity of light is

The correct order of covalent radii of Si, Ge, Sn is:

The first ionization enthalpies of Na, Mg and Si are respectively 496, 737 and 786 kJ mol⁻¹. What would be the first ionization enthalpy of Al in kJ mol⁻¹?

Which of the following is not the property of covalent substances?

At 300 K, one mole of a gas present in a 10 L flask exerted a pressure of 2.706 atm. What is its compressibility factor (Z)?

At T (K), equal weights of H$_2$, D$_2$, and T$_2$ are present in closed vessel. The pressure exerted by this gaseous mixture is P atm. The ratio of partial pressures of T$_2$, D$_2$ and H$_2$ is approximately (H, D and T are isotopes of hydrogen).

6 g of urea (molar mass = 60 g mol$^{-1}$) and 9 g of glucose (molar mass = 180 g mol$^{-1}$) were dissolved in 35 g of water. The mass percent of urea and glucose is respectively.

If the work done by 2 mol of an ideal gas during isothermal reversible expansion from 5 L to 50 L is -189.1 L atm at constant pressure, the temperature of the gas (in °C) is

At 300 K the enthalpy change for the following reaction is -2800 kJ mol$^{-1}$ \[ C_6H_{12}O_6(s) + 6O_2(g) \rightarrow 6CO_2(g) + 6H_2O(l) \] What is the \(\Delta U\) for the same reaction at 300 K (kJ mol$^{-1}$)?

At T(K), the equilibrium constant for the reaction \( A (g) \rightleftharpoons B (g) \) is \( K_c \). If the reaction takes place in the following form \( 2A(g) \rightleftharpoons 2B(g) \), its equilibrium constant is \( K'_c \). The correct relationship between \( K_c \) and \( K'_c \) is:

Observe the following solutions \[ \text{I. Black coffee} \quad \text{II. 0.2M NaOH} \quad \text{III. Lemon juice} \quad \text{IV. Lime water} \quad \text{V. Human Saliva} \quad \text{VI. Tomato juice} \] The number of solutions having pH range of 1-7 and 7-14, in the above list, is respectively

Among the following, the correctly matched pair is:

The correct order of melting points of Al, Ga, In is:

Among the following the correct statements are
I. Germanium exists only in traces
II. PbF4 molecule is tetrahedral in shape
III. GeX2 is more stable than GeX4

Which of the following reaction is not feasible?

Match the following

In \( A_3B \) crystal structure, A atoms occupied all octahedral as well as all tetrahedral voids and B atoms are at FCC centres. What is the formula of compound \( A_3B \)?

What is the van't Hoff factor of Ferric Sulphate (Assume 100% ionization)?