List of top Chemistry Questions asked in AP EAPCET

What is Z in the given reaction sequence? \[ {(1) } B_2H_6 \longrightarrow X \xrightarrow{PCC} Y \xrightarrow{NH_2OH} Z \] \[ {(2) } H_2O, H_2O_2, OH^- \]

Polyacrylonitrile is used as a substitute for wool in making commercial fibres as acrilan. The structure of it is:

A compound consists of atoms A and B. The atoms of B form hcp lattice. The atoms of A occupy $\frac{1}{3}$ rd of octahedral voids and $\frac{1}{3}$ rd of tetrahedral voids. What is the molecular formula of the compound?

Consider the following statements:
Statement-I: The products formed when diborane burns in air are ${B}_2{O}_3$, ${H}_2$, and ${O}_2$.
Statement-II: Hybridization of boron atom in orthoboric acid is $sp^2$. The correct answer is:

Which of the following is not related to the removal of permanent hardness of water?

At what temperature rms speed of ${SO}_3$ molecules is $3.16 \times 10^2 \, {ms}^{-1}$? (R = 8.314 J K$^{-1}$ mol$^{-1}$)

Observe the following molecules:
${SO}_2, {H}_2{O}, {HgCl}_2, {BeCl}_2, {XeF}_2, {O}_3, {NO}_2, {PbCl}_2$.
The number of molecules with the same geometry as that of ${SnCl}_2$ is:

A spectral line of Lyman series of H-atom has a frequency of $2.466 \times 10^{15} \, {s}^{-1}$. What is the transition responsible for this spectral line? (Rydberg constant $R = 1.096 \times 10^7 \, {m}^{-1}$)

The disease caused by deficiency of pyridoxine is:

Which of the following is a non-reducing sugar?

Which one of the following oxidizes manganous salt to permanganate in aqueous solution?

The ore, concentrated by froth floatation process is:

Consider the following cell at 298 K:
\[ {Mg(s)} | {Mg}^{2+}(x M) || {Zn}^{2+}(y M) | {Zn(s)} \] The cell reaction reached the equilibrium state. What is the value of $\log \frac{[{Mg}^{2+}]}{[{Zn}^{2+}]}$? Given: \[ E^\circ_{{Mg}^{2+}/{Mg}} = -2.36\, V; E^\circ_{{Zn}^{2+}/{Zn}} = -0.76\, V; \frac{2.303 RT}{F} = 0.06\, V \]

If the kinetic energy of a particle having wavelength $x \, {\AA}$ is increased to three times, its de Broglie wavelength (in {\AA}) is:

A current of 2 A is passed through molten CaCl$_2$ for 1930 seconds. What is the mass of calcium deposited at the cathode? (Ca molar mass = 40 g/mol, valency = 2, Faraday's constant = 96500 C/mol)

In a redox titration, 25 mL of 0.1 M KMnO$_4$ is required to completely react with oxalic acid in acidic medium. The volume of 0.2 M oxalic acid used is:
(Balanced reaction: $ 2\text{MnO}_4^- + 5\text{C}_2\text{O}_4^{2-} + 16\text{H}^+ \rightarrow 2\text{Mn}^{2+} + 10\text{CO}_2 + 8\text{H}_2\text{O} $)

The major product formed when 2-bromo-2-methylbutane is treated with alcoholic KOH is:

What is the normality of a solution containing 4.9 g of $ \text{H}_2\text{SO}_4 $ in 500 mL of solution? (Molar mass of $ \text{H}_2\text{SO}_4 $ = 98 g/mol)

For a first-order reaction, the concentration of a reactant decreases from 0.8 M to 0.4 M in 20 minutes. What is the half-life of the reaction? (Use $\ln 2 = 0.693$)

Which of the following complexes will exhibit optical isomerism?

The nitration of benzene using a mixture of concentrated $\mathrm{H_2SO_4}$ and concentrated $\mathrm{HNO_3}$ gives:

For a reaction: $ A + B \rightarrow \text{Products} $ It is found that doubling the concentration of A doubles the rate, while doubling B increases the rate fourfold. What is the overall order of the reaction?

Which of the following compounds undergoes Markovnikov addition when treated with HBr?

The combustion of methane is represented by the equation: \[ \text{CH}_4(g) + 2\text{O}_2(g) \rightarrow \text{CO}_2(g) + 2\text{H}_2\text{O}(l) \] Given: $\Delta H_{\text{CH}_4} = -75 \, \text{kJ/mol}$
$\Delta H_{\text{CO}_2} = -393.5 \, \text{kJ/mol}$
$\Delta H_{\text{H}_2\text{O}} = -285.8 \, \text{kJ/mol}$
What is the enthalpy change ($\Delta H$) for the combustion of 1 mole of methane?

The enthalpy of combustion of methane is 890 kJ/mol. How much heat is released when 8 g of methane is burned completely? (Molar mass of CH$_4$ = 16 g/mol)