List of top Questions asked in AP EAPCET

Which of the following form an ideal solution?
(I) Chloroethane and bromoethane (II) Benzene and toluene \[ \text{(III) } n\text{-Hexane and } n\text{-heptane} \] (IV) Phenol and aniline

The correct order of coagulating power of the following ions to coagulate the positive sol is
\[ \text{I. } [Fe(CN)_6]^{4-} \] \[ \text{II. } Cl^{-} \] \[ \text{III. } SO_4^{2-} \]

An element crystallising in fcc lattice has a density of \(8.92\,\text{g cm}^{-3}\) and edge length of \(3.61\times 10^{-8}\,\text{cm}\). What is the atomic weight of element?
\((N=6.022\times 10^{23}\,\text{mol}^{-1})\)

Which of the following statement is correct for fcc lattice?

The IUPAC name of the following compound is

The gaseous mixture used for welding of metals is

Identify the species, which does not exist

Identify the \(P\) and \(Q\) of the following reaction
\[ P+Q\longrightarrow [B(OH)_4]^-+H_3O^+ \]

At \(500\,\text{K}\), for the reaction, \[ N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g), \] the \(K_p\) is \(0.036\,\text{atm}^{-2}\). What is its \(K_c\) in \(L^2\text{mol}^{-2}\)? \((R=0.082\,L\,\text{atm mol}^{-1}\text{K}^{-1})\)

The relative basic strength of the compounds is correctly shown in the option

Calcium carbide \(+\,D_2O \rightarrow X + Ca(OD)_2\). The hybridization of carbon atom/s in \(X\)

The two main constituents of Portland cement are

Identify the correct statements from the following
\[ \text{(a) } BeSO_4 \text{ is soluble in water} \] \[ \text{(b) } BeO \text{ is an amphoteric oxide} \] \[ \text{(c) } CO \text{ can be obtained by heating } CaCO_3 \text{ at } 1070-1270\,K \]

Use the data from table to estimate the enthalpy of formation of \(CH_3CHO\).
\[ \begin{array}{|c|c|c|} \hline \text{Bond Enthalpy} & \text{Bond} & \text{Enthalpy of formation} \\ \hline 400\ \text{kJ mol}^{-1} & C-H & C(g)=700\ \text{kJ mol}^{-1} \\ \hline 350\ \text{kJ mol}^{-1} & C-C & H(g)=200\ \text{kJ mol}^{-1} \\ \hline 700\ \text{kJ mol}^{-1} & C=O & O(g)=250\ \text{kJ mol}^{-1} \\ \hline \end{array} \]

Identify the correct statements from the following
\[ \text{I. At }0\,K,\text{ the entropy of pure crystalline materials approaches zero.} \] \[ \text{II. Entropy for the process }H_2O(l)\longrightarrow H_2O(g)\text{ decreases.} \] III. Gibbs energy is a state function.

The set of species having only fractional bond order values is

\(50\,\text{g}\) of a substance is dissolved in \(1\,\text{kg}\) of water at \(+90^\circ\text{C}\). The temperature is reduced to \(+10^\circ\text{C}\). The density is increased from \(1.1\) to \(1.15\,\text{g cc}^{-1}\). What is the % change of molarity of the solution?

What are the oxidation numbers on S atoms in \(S_4O_6^{2-}\)?

Identify the correct variation of pressure and volume of a real gas (A) and an ideal gas (B) at constant temperature.
(\(y=P;\;x=V\))

In the Lewis dot structure of carbonate ion shown under, the formal charges on the oxygen atoms \(1,2\) and \(3\) are respectively:

Frequencies in the UHF range normally propagate by means of

An element \(X\) with atomic number \(13\) forms a complex of the type \([XCl(H_2O)_5]^{2+}\). The covalency and oxidation state of \(X\) in it are respectively

The energy required (in eV) to excite an electron of H-atom from the ground state to the third state is

The wavelength associated with the electron moving in the first orbit of hydrogen atom with velocity \(2.2\times 10^6\,\text{m s}^{-1}\) (in nm) is
\((m_e=9.0\times 10^{-31}\,\text{kg},\; h=6.6\times 10^{-34}\,\text{Js})\)

In which of the following, oxides of three elements \(X\), \(Y\) and \(Z\) are correctly arranged in the increasing order of acidic nature. The electronic configurations of \(X\), \(Y\) and \(Z\) are \([\text{Ne}]3s^23p^1\), \([\text{Ne}]3s^23p^5\), \([\text{Ne}]3s^2\) respectively.