List of top Questions asked in AP EAMCET

In the reaction of sodium borohydride with \(X\) gives diborane as one product. Identify \(X\) and type of reaction. 
 

Identify the correct order of polarizing power of given cations: 
 

Identify the correct statements from the following:
(i) In gas phase, the dihedral angle in H₂O₂ is 90.2°
(ii) 50% H₂SO₄ is used in the preparation of H₂O₂ by electrolysis method
(iii) H₂O₂ is used in the synthesis of cephalosporin

The dissociation constants of a diacid HA are \(K_{a1} = 6 \times 10^{-2}\) and \(K_{a2} = 6 \times 10^{-5}\). The pH of 0.011 M \(HA\) solution is 2.0. What is the value of \(\left[\frac{{A}^-}{{HA}}\right]\)? 
 

At 500 K, for the reaction \[ {PCl}_5(g) \leftrightarrow {PCl}_3(g) + {Cl}_2(g) \] the equilibrium constant \( K_c \) is 1.8 mol/L. What is \( K_p \) in atm at the same temperature? \[ R = 0.082 { L atm mol}^{-1} {K}^{-1} \] 

A solid is dissolved in 1 L water. The enthalpy of its solution (\(\Delta H_{{sol}}^\circ\)) is 'x' kJ/mol. The hydration enthalpy (\(\Delta H_{{hyd}}^\circ\)) for the same reaction is 'y' kJ/mol. What is lattice enthalpy (\(\Delta H_{{lattice}}^\circ\)) of the solid in kJ/mol? 

Identify the correct statements from the following:
I. For spontaneous reaction, ΔSₜₒₜₐₗ < 0 and ΔH > 0
II. Pressure is an intensive property
III. Bomb calorimeter works at constant volume

50 mL of 1 M HCl was completely reacted with \(x\) g of CaCO3 to form CaCl2, CO2, and H2O. What is the value of \(x\) in g? 
 

A few isotherms of CO2 are shown below. Identify the correct statements (Tc is the critical temperature of CO2; T1<T2<T3<Tc):
I. At point X, CO₂ exists as liquid
II. At point Y, CO₂ exists as gas
III. At point Z, CO₂ exists as liquid

At 300 K, the value of \(u_{{rms}}^2\) of an ideal gas is \(x \, {m}^2/{s}^2\). What is the \(u_{{av}}^2\) (in \({m}^2/{s}^2\)) of this gas at the same temperature? 
 

The number of molecules having one lone pair of electrons on the central atom is from the following list: SnCl$_2$, XeF$_6$, SO$_3$, ClF$_3$, BrF$_5$, H$_2$O, XeO$_3$. 

Which of the following sets are not correctly matched? 
i. XeF₄ - sp³
ii. SF₄ - sp³d
iii. SO₃ - sp²
iv. SnCl₂ - sp

Electronic configurations of four elements A, B, C, and D are given below: \[ {A: } 1s^2 2s^2 2p^4, \quad {B: } 1s^2 2s^2 2p^6 3s^1, \quad {C: } 1s^2 2s^2 2p^6, \quad {D: } 1s^2 2s^2 2p^5 \] The correct order of increasing tendency to gain electrons is: 
 

The correct set of four quantum numbers for an electron in a 4d subshell is: 
 

The mass of particle X is four times the mass of particle Y. The velocity of particle Y is four times the velocity of X. The ratio of de Broglie wavelengths of X and Y is: 

In amplitude modulation, the amplitude of the carrier signal is 28 V and the modulation index is 0.4. The amplitude of the side bands is: 
 

In the given figures of logic gates, if the inputs are A=1, B=0, and C=1, find the values of \( y_1 \), \( y_2 \), and \( y_3 \) respectively. 

 

If the input frequency is 50 Hz, the output frequency of a full wave rectifier is: 
 

The ratio of the wavelengths of the first and second Balmer lines of the hydrogen spectrum is: 
 

A proton and an alpha particle are moving with kinetic energies of 4.5 MeV and 0.5 MeV respectively. The ratio of the de Broglie wavelengths of the proton and alpha particle is: