List of top Chemistry Questions asked in AP EAPCET

Select the correct statements from the following
A)
Aluminium liberates \( \mathrm{H_2} \) gas with dil.\( \mathrm{HCl} \) but not with aqueous \( \mathrm{NaOH} \).
B)
Formula of sodium metaborate is \( \mathrm{Na_3BO_3} \)
C)
Boric acid is a weak monobasic acid
D)
For thallium, +1 state is more stable than +3 state.
For which reaction \( \Delta H \neq \Delta U \)?
At 298 K, \(\Delta_r G^\circ\) for the reaction \(\frac{3}{2} O_2(g) \to O_3(g)\) is 165.469 kJ mol\(^{-1}\). What is the equilibrium constant for this reaction?
A → P is a first order reaction. At T(K), the concentration of reactant (A) after 10 min of the reaction is \(x\) mol L\(^{-1}\). After 20 min, the concentration of A is \(y\) mol L\(^{-1}\). What is its rate constant (in min\(^{-1}\))?
At what temperature (in K) the rms velocity of SO\(_2\) molecules is equal to rms velocity of O\(_2\) molecules at \(27 \, ^\circ\text{C}\)?
The de Broglie wavelength of an electron in the third Bohr orbit of H-atom is
Which of the following methods is useful for producing semiconductor grade metals of high purity?
The uncertainty in the position of electron ($\Delta x$) is approximately 100 pm. The uncertainty in momentum (in kg m s$^{-1}$) of an electron is [h = 6.626 $\times 10^{-34}$ Js]
Which of the following is not correct?
\( x \) 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:
Consider the following equilibrium reaction in gaseous state at T(K): \[ A + 2B \rightleftharpoons 2C + D \] The initial concentration of B is 1.5 times that of A. At equilibrium, the concentrations of A and B are equal. The equilibrium constant for the reaction is:
Which of the following properties is not correct for silicones?
What are X, Y, Z in the following reaction sequence? But-2-ene \( \xrightarrow{X} \) Ethanoic acid \( \xrightarrow{Y} \) Ethanoyl chloride \( \xrightarrow{\text{Benzene, Anhy. AlCl}_3} \) Z
Consider the following:
Assertion (A): Nitric acid - water mixture is a maximum boiling azeotrope.
Reason (R): Nitric acid - water mixture shows positive deviation from Raoult’s law.
$R \to P$ is a first-order reaction. The concentration of R changed from 0.04 to 0.03 mol L$^{-1}$ in 40 minutes. What is the average velocity of the reaction in mol L$^{-1}$ s$^{-1}$?
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\(^{-1}\)?
In \( \text{Fe}_x[\text{Fe}_y(\text{CN})_6]_3 \), x, y respectively, are
Which of the following elements exhibits variable oxidation states and forms colored compounds?
The difference between the radii of \(3^{rd}\) and \(2^{nd}\) orbit of H-atom is x pm. The difference between the radii of \(4^{th}\) and \(3^{rd}\) orbit of \( \text{Li}^{2+} \) ion is y pm. \(y:x\) is equal to
In a Freundlich adsorption isotherm, if the slope is unity and k is 0.1, the extent of adsorption at 2 atm is (log 2 = 0.30)
Which one of the following reactions is not feasible?
Two acids A and B are titrated separately. 25 mL of 0.5 M Na$_2$CO$_3$ solution requires 10 mL of A and 40 mL of B for complete neutralisation. The volume (in L) of A and B required to produce 1 L of 1 N acid solution respectively are
Identify the herbicides from the following:
a) DDT b) Aldrin c) Sodium chlorate d) Nicotine e) Sodium arsenite
What are X and Y respectively in the following set of reactions?
cresol
0.25 moles of $ \text{CH}_2\text{FCOOH} $ was dissolved in $ 0.5 \, \text{kg} $ of water. The depression in freezing point of the resultant solution was observed as $ 1^\circ \text{C} $. What is the van't Hoff factor? ($ K_f = 1.86 \, \text{K kg mol}^{-1} $)