List of top Questions asked in AP EAPCET

If the angle of diffraction (\(\theta\)) is \(60^\circ\) for 9 \AA wavelength of x-rays, what is the spacing between two planes of a solid substance for a first order diffraction (\(n=1\))? (Given: \(\sin 60^\circ = 0.866\))
An element crystallizes in a bcc lattice of edge length 4 \AA. If the density of the element is 10 g cm\(^{-3}\), what is its atomic weight (g mol\(^{-1}\))?
The product P of the following sequence of reactions is:

\(\Delta G^\circ\) value for the following oxidation process is:
\[ A \rightarrow A^{3+} + 3e^- \] Given: \[ A \rightarrow A^+ + e^- \quad \Delta G^\circ = 1J \] \[ A^+ \rightarrow A^{3+} + 2e^- \quad \Delta G^\circ = 3J \]
The formula which represents the inorganic benzene is:
Observe the following statements: I) Second ionization enthalpy of Be is smaller than lithium II) Hydration enthalpy of Mg\(^{2+}\) is greater than Be\(^{2+}\) III) Ionic radius of Li\(^+\) is greater than Be\(^{2+}\) Correct statements are:
The allotrope of carbon formed when hydrocarbons are burnt in limited supply of air is:
In which of the following ions are correctly arranged with respect to their mobilities in aqueous solution?
The number of cyclic isomers possible for C\(_4\)H\(_6\) with one double bond in the ring is:
100 mL of 0.01 M HCl is added to 900 mL H\(_2\)O. What is the pH of the resultant solution?
The conjugate base of \(H_2PO_4^{-}\) is:
Ca\(^{2+}\) + Na\(_6\)(PO\(_3\))\(_6\) → X + yNa\(^+\). Identify X
How many litres of O\(_2\) at 273 K and 1 atm pressure can give 20 L of CO in the following reaction?
\[ C + O_2 \rightarrow CO_2 \rightarrow CO \]
Combustion of 1 mole graphite releases \(2.48 \times 10^2\) kJ of energy. What will be the temperature of a bomb calorimeter if 1 g of graphite is burnt at 298 K, given heat capacity = 10.35 kJ/K?
Cp of a gas is 20 J mol\(^{-1}\) K\(^{-1}\). If one mole of the gas is cooled from 298 K to 258 K at constant pressure, calculate the internal energy change of the system. (R = 8.3 J mol\(^{-1}\) K\(^{-1}\))
The period number and group number of platinum in the long form of periodic table are respectively:
3.68 g of hydrogen at 17°C occupies the same volume as 58.0 g of another gas X at 95°C. The molar mass of gas X is (g mol\(^{-1}\)):
100 g of a hydrocarbon \(C_xH_y\) is completely burnt to produce 130 g of \(H_2O\). The produced carbon dioxide can use 228.56 g of \(O_2\) via photosynthesis. What is the molecular formula of the hydrocarbon?
Group – 2 element (A) when reacts with group – 15 element (X), the general formula of the compound formed is:
Identify the group number of the element X which has 1.44 % more neutrons than protons (Mass number of X is 127):
The bond order of peroxide ion is x. The bond order of superoxide ion is:
A radiation of energy 11.0 eV is irradiated on gaseous hydrogen atoms at room temperature. Identify the energy level to which electron of hydrogen atom can be excited:
The phenomenon of removal of electrons from a metal surface when it is made to strike with radiation of suitable frequency is called:
Identify the major products P and Q from the following set of reaction sequences:



Enlarged P-wave