List of top Questions asked in AP EAPCET

Correct statements about oxidising smog are I. \[ \text{Primary precursors of it are } O_3,\ PAN \] II. It occurs in warm, dry and sunny climate III. Its formation can be controlled by the use of catalytic converters in automobiles

From the following list, identify the number of substituents which exert \(+R\) effect when present on benzene ring \[ -Cl,\quad -COCH_3,\quad -NHC_2H_5,\quad -OCH_3,\quad -NHCOCH_3,\quad -COOCH_3 \]

A compound is formed by \(A\) (cations), \(B\) (cations) and \(O\) (anions). Atoms of \(O\) form a ccp lattice. Atoms of \(A\) occupy \(50\%\) of octahedral voids and atoms of \(B\) occupy \(25\%\) of tetrahedral voids. What is the molecular formula of the compound?

\(X\), \(Y\) and \(Z\) are three allotropes of carbon. They are used in black ink, in water filters and as reducing agent in metallurgy respectively. The correct statement about their production is

An alkyne \(X\) \((C_4H_6)\) does not form sodium alkynide. Reaction of \(X\) with HBr gave \(Y\). Another reaction of \(X\) with \(Na/\text{liq. }NH_3\) gave \(Z\). Identify \(Y\) and \(Z\).

At \(298\,K\), for the reaction \[ N_2(g)+3H_2(g)\rightleftharpoons 2NH_3(g) \] \[ \Delta H=-92.4\ \text{kJ} \] and \[ \log K_c=5.75. \] What is the entropy change \((\Delta S)\) (in J K\(^{-1}\)) for this reaction at the same temperature? \[ (R=8.3\ \text{J K}^{-1}\text{mol}^{-1}) \]

At \(450\,K\), for the reaction \[ 2SO_2(g)+O_2(g)\rightleftharpoons 2SO_3(g), \] the value of \[ K_p=2.0\times10^{10}. \] What is the value of \(K_c\) for the decomposition of sulphur trioxide at the same temperature? \[ R=0.083\ \text{L bar mol}^{-1}\text{K}^{-1} \]

Identify the sets in which both the metals react with water? \[ \text{I.}\quad Be,\ Mg \] \[ \text{II.}\quad Li,\ Mg \] \[ \text{III.}\quad Na,\ K \] \[ \text{IV.}\quad K,\ Ca \]

Identify the correct statements from the following I) \[ \text{Conjugate base of nitrous acid is } NO_2^{-} \] II) \[ \text{The concentration of } OH^{-} \text{ ions in } 0.1\,M \text{ aqueous pyridine solution is } \sqrt{2}\times10^{-5}\,M \] \[ (K_b \text{ of pyridine }=2\times10^{-9}) \] III) The acid strength of aqueous hydrogen halides follows \[ HF \gt HCl \gt HBr \gt HI \]

Observe the following unbalanced reactions \[ KO_2 \xrightarrow{\;HOH\;} X + Y\uparrow + KOH \] \[ KMnO_4 \xrightarrow[\text{basic medium}]{\;X\;} Y + Z + KOH + H_2O \] Y and Z are respectively

The reaction between \(X\) and \(Y\) produces a solid substance and a mixture of two gases, one of which is a colourless toxic gas. \(X\) and \(Y\) respectively are

Which of the following sets contain isostructural molecules? I. \[ H_2O,\ OF_2,\ SCl_2 \] II. \[ CO_2,\ BeCl_2,\ HgCl_2 \] III. \[ SiCl_4,\ SF_4,\ XeF_4 \]

At \(298\,K\), the value of \((\Delta H-\Delta U)\) for the combustion of 1 mole of \[ C_4H_{10}(g) \] is \(x\) kJ and for the combustion of 1 mole of glucose, the value of \[ (\Delta H-\Delta U) \] is \(y\) kJ. The value of \((x-y)\) (in kJ) is \[ (R=8.3\ \text{J K}^{-1}\text{mol}^{-1}) \]

Formal charge on sulphur atom in the following three Lewis structures I, II and III respectively is \[ \text{I.}\quad \ddot{S}=C=\ddot{N} \] \[ \text{II.}\quad :S-C\equiv N: \] \[ \text{III.}\quad :S\equiv C-N: \]

At \(27^\circ C\), a real gas of molar mass \[ 44\ \text{g mol}^{-1} \] occupies a volume of \[ 0.4\ \text{L} \] at a pressure of \[ 40\ \text{atm}. \] If the compressibility factor is \[ Z=0.65, \] what is its weight (in g)? \[ (R=0.082\ \text{L-atm K}^{-1}\text{mol}^{-1}) \]

Which of the following statements are correct? I. In the third period, two elements have higher ionization enthalpy than the element immediately following them in the same period. II. Electronegativity of carbon is higher than that of phosphorus. III. An element \(X\) belongs to group 14 and period 3. The number of electrons present in it is \(14\).

\(x\) mL of \(0.05\,M\) \(KMnO_4\) solution is required to oxidise completely \(1.52\) g of \(FeSO_4\) in acidic medium. The value of \(x\) is \[ (\text{Atomic weights: } Fe=56,\ S=32,\ O=16) \]

The number of radial nodes possible for \(3p\)-orbital is \(x\) and the number of angular nodes possible for \(4d\)-orbital is \(y\). What is \(x:y\)?

Threshold frequencies of the metals \(A\) and \(B\) are respectively \[ 4\times10^{14}\ \text{Hz} \] and \[ 6\times10^{14}\ \text{Hz}. \] If both are irradiated with light of frequency \[ 10^{15}\ \text{Hz}, \] what is the ratio of the kinetic energies of electrons emitted from \(A\) and \(B\)?

The type of radioactive decay that involves the emission of a positron is

The value of \(Q\) in the given digital circuit is

If the wavelength of the signal to be transmitted by an antenna is increased by \(2\) times, then the effective power radiated by the antenna

An electron has an angular momentum of \[ 90h\ \text{J s} \] while orbiting with a linear velocity of \[ \pi\times10^5\ \text{m s}^{-1}. \] Then the radius of the orbit is \[ \left( m_e=9\times10^{-31}\,\text{kg}, \quad h=6.6\times10^{-34}\,\text{J s} \right) \]

An inductor of inductance \[ 5\,\text{H} \] is carrying an electric current of \[ 4\,\text{mA}. \] Then the energy stored in the inductor is

The kinetic energy of the released electron in photoelectric effect depends on