List of top Chemistry Questions asked in AP EAPCET

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

The ore, concentrated by froth floatation process is:

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$^{-1}$)?

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: \[ E^\circ_{{Mg}^{2+}/{Mg}} = -2.36\, V; E^\circ_{{Zn}^{2+}/{Zn}} = -0.76\, V; \frac{2.303 RT}{F} = 0.06\, V \]

Which of the following is the most effective protective colloid on the basis of gold number values?

Consider the following:
Statement-I: The charge on colloidal particle can be confirmed by electrophoresis experiment.
Statement-II: Whipped cream is an example of Aerosol. The correct answer is:

The value of $\Delta_r H$ for the reaction:
\[ {N}_2{O}_4(g) + 3 {CO}(g) \rightarrow {N}_2{O}(g) + 3 {CO}_2(g) \] (in kJ) is:
(Given: Enthalpies of formation in kJ mol$^{-1}$ are ${CO}(g) = -110$, ${CO}_2(g) = -393$, ${N}_2{O}(g) = 81$, and ${N}_2{O}_4(g) = 9.7$)

The enthalpy of atomization of ${CH}_3{NH}_2(g)$ is 2313 kJ mol$^{-1}$. If $\Delta_{{C-H}}^{\ominus}$ and $\Delta_{{N-H}}^{\ominus}$ are 414 and 389 kJ mol$^{-1}$ respectively, then $\Delta_{{C-N}}^{\ominus}$ (in kJ mol$^{-1}$) will be:

At T(K), the equilibrium constant for the reaction \[ {N}_2(g) + 3{H}_2(g) \rightleftharpoons 2{NH}_3(g) \] is $6 \times 10^{-2}$. At equilibrium, if the molar concentrations of ${H}_2$ and ${NH}_3$ are 0.25 M and 0.06 M respectively, the equilibrium concentration of dinitrogen (in mol L$^{-1}$) is:

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

From the following identify the change in which electron gain enthalpy is positive. (g = gas phase):

How many molecules are present in 4.4 grams of CO$_2$?
(Molar mass of CO$_2$ = 44 g/mol, Avogadro's number = $6.022 \times 10^{23}$)

How many moles of $\mathrm{CO_2}$ are produced when 4 moles of $\mathrm{C_2H_6}$ (ethane) combust completely?
Given reaction: \[ 2 \mathrm{C_2H_6} + 7 \mathrm{O_2} \rightarrow 4 \mathrm{CO_2} + 6 \mathrm{H_2O} \]

A gas occupies 2 liters at a pressure of 3 atm. What will be its volume when the pressure is reduced to 1.5 atm at constant temperature?

What is the molarity of a solution prepared by dissolving 10 grams of NaOH (molar mass = 40 g/mol) in 500 mL of solution?

A compound contains 40% carbon, 6.7% hydrogen, and 53.3% oxygen by mass. What is its empirical formula?

Calculate the enthalpy change ($\Delta H$) for the combustion of 1 mole of methane ($\mathrm{CH}_4$) given the reaction: $$ \mathrm{CH}_4(g) + 2 \mathrm{O}_2(g) \rightarrow \mathrm{CO}_2(g) + 2 \mathrm{H}_2 \mathrm{O}(l) $$ Given bond energies: C–H = 413 kJ/mol, O=O = 498 kJ/mol, C=O = 803 kJ/mol, O–H = 467 kJ/mol.

The rate constant for a first-order reaction is $ 0.0693 \, \text{min}^{-1} $. What is the half-life of the reaction?

What is the IUPAC name of the compound $ \text{CH}_3\text{CH}_2\text{COCH}_2\text{CH}_3 $?

Which of the following elements has the highest first ionization energy?

The enthalpy change (ΔH) for the reaction N₂(g) + 3H₂(g) → 2NH₃(g) is -92 kJ/mol.

What is the enthalpy change for the decomposition of 1 mol of NH₃(g) into its elements?

How many grams of calcium carbonate ($\mathrm{CaCO}_3$) are required to completely neutralize 200 mL of 0.5 M HCl? Given the reaction: $$ \mathrm{CaCO}_3 + 2 \mathrm{HCl} \rightarrow \mathrm{CaCl}_2 + \mathrm{H}_2 \mathrm{O} + \mathrm{CO}_2 $$ (Molar mass of $\mathrm{CaCO}_3 = 100 \, \text{g/mol}$)

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)

Calculate the boiling point of a solution containing 18 g of glucose (C$_6$H$12$O$_6$) in 100 g of water. (K₋b = 0.52°C·kg/mol, Molar mass of glucose = 180 g/mol)

Calculate the molality of a solution prepared by dissolving 10 g of NaCl ($ M = 58.5 \, \text{g/mol} $) in 500 g of water: