List of top Questions asked in AP EAPCET

In which one of the following complexes the metal ion has \( t_{2g}^3 e_g^2 \) configuration?

Consider the following statements: Statement-I: Primary structure of protein represents its constitution. Statement-II: \( \alpha \)-Helix and \( \beta \)-pleated sheet structure of protein represent tertiary structure of it. The correct answer is:

Consider the following: Statement-I: In the extraction of Al by Hall-Heroult process, pure \( Al_2O_3 \) mixed with \( Na_3AlF_6 \) lowers its melting point and increases conductivity. Statement-II: Zirconium metal is purified by zone refining method. The correct answer is:

A solution of urea in water has a boiling point of \( 100.18^\circ C \). What is the freezing point of the same solution, if \( K_f \) and \( K_b \) of water are \( 1.86 \) and \( 0.52 \) K kg mol\(^{-1} \), respectively? (Boiling point of water = \( 100^\circ C \))

At \( T \)(K), the vapour pressure of pure benzene and toluene are \( 75 \) and \( 22 \) mm Hg respectively. 23.4 g of benzene and 64.4 g of toluene are mixed to form an ideal solution. If the vapours are in equilibrium with the liquid mixture, the mole fraction of toluene in vapour phase is:

At 298 K, the following reaction takes place for a cell at the hydrogen electrode: \[ H^+(aq) + e^- \longrightarrow \frac{1}{2} H_2 (1 \text{ bar}) \] The solution pH is 10.0. What is the hydrogen electrode potential in volts? (\(\frac{2.303RT}{F} = 0.06\) V)

A \( \rightarrow \) B is a first-order reaction. The concentration of A is decreased from \( x \) mol \( L^{-1} \) to \( y \) mol \( L^{-1} \) in \( 100 \) min. What is the average velocity of the reaction in mol \( L^{-1} \) min\(^{-1}\)?

The adsorption of a gas on a solid surface follows Freundlich adsorption isotherm. At \( T \)(K), the gas pressure is \( 2 \) atm. What is the value of \( \frac{x}{m} \)? (\( n = 2 \) and \( k \) = constant)

Which one of the following acts as an autocatalyst during titration of \( KMnO_4 \) and oxalic acid in presence of dilute \( H_2SO_4 \)?

The correct order of density of Be, Mg, Ca, Sr is:

Identify the reaction in which diborane is produced on an industrial scale:

Which of the following properties is not correct for silicones?

The element whose percentage composition in an organic compound can be determined by Carius method is:

\( x \) mg of an organic compound was analysed by Kjeldahl method. The ammonia evolved was absorbed in 50 mL of 0.5 M \( H_2SO_4 \). The unused acid required 60 mL of 0.5 M \( NaOH \) solution for complete neutralisation. If the percentage of nitrogen in the compound is \( 56 \), the value of \( x \) is:

The composition of a sample of wustite is \( \text{Fe}_{0.93} \text{O}_{1.00} \). Percentage of iron in the form of \( \text{Fe}^{3+} \) ion is nearly:

Which one of the following reactions is not feasible?

For which reaction \( \Delta H \neq \Delta U \)?

At \( 298 \) K, \( \Delta U^\circ \) and \( \Delta S^\circ \) for the following reaction are \( -10.5 \) kJ and \( +44.1 \) J\( K^{-1} \); \( 2X(g) + Y(g) \longrightarrow 2Z(g) \). What is \( \Delta G^\circ \) (in kJ) for this reaction? (\( R = 8.314 \) J\( K^{-1} \)mol\(^{-1} \))

Consider the following gaseous equilibrium reactions (I), (II) and (III) with equilibrium constants \( K_1 \), \( K_2 \), and \( K_3 \) respectively:
I) \( \frac{1}{2} N_2 + \frac{3}{2} H_2 \rightleftharpoons NH_3 \)
II) \( 2NO \rightleftharpoons N_2 + O_2 \)
III) \( H_2 + \frac{1}{2} O_2 \rightleftharpoons H_2O \)
The correct expression for the equilibrium constant for the gaseous equilibrium reaction: \[ 2NH_3 + \frac{5}{2} O_2 \rightleftharpoons 2NO + 3H_2O \]

When 30 mL of 0.2 M \( NH_4OH \) is added to 30 mL of 2 M \( NH_4Cl \) solution. If the pH of the buffer formed is 8.2, what is the \( pK_b \) of \( NH_4OH \)?

Which set of elements form electron-precise hydrides?

The de Broglie wavelengths of two fast-moving particles \( X \), \( Y \) are \( 1 \) nm, \( 3 \) nm respectively. Mass of \( X \) is nine times the mass of \( Y \). The ratio of kinetic energies of \( X \), \( Y \) is:

A molecule has a T-shape. The total number of electron pairs in the valence shell of its central atom is:

The sum of bond order values of \( C_2 \) and \( O_2^{2-} \) is \( x \), which is equal to the sum of bond order values of \( a, b, \) and \( c \). What are \( a, b, \) and \( c \)?