List of top Chemistry Questions asked in AP EAPCET

1.95 g of non-volatile and non-electrolyte solute dissolved in 100 g of benzene lowered the freezing point of it by 0.64 K. The molar mass of the solute (in g mol$^{-1}$) ($K_f(\text{C}_6\text{H}_6) = 5.12 \, \text{K kg mol}^{-1}$) is

A solution of urea in water has a boiling point of $ 100.18^\circ C $. What is the freezing point of the same solution, if $ K_f $ and $ K_b $ of water are $ 1.86 $ and $ 0.52 $ K kg mol$^{-1} $, respectively? (Boiling point of water = $ 100^\circ C $)

1.95 g of non-volatile and non-electrolyte solute dissolved in 100 g of benzene lowered the freezing point of it by 0.64 K. The molar mass of the solute (in g mol$^{-1}$) ($K_f(\text{C}_6\text{H}_6) = 5.12 \, \text{K kg mol}^{-1}$) is

A solution of urea in water has a boiling point of $ 100.18^\circ C $. What is the freezing point of the same solution, if $ K_f $ and $ K_b $ of water are $ 1.86 $ and $ 0.52 $ K kg mol$^{-1} $, respectively? (Boiling point of water = $ 100^\circ C $)

What is the approximate molality of 10% (w/w) aqueous glucose solution? (Molar mass of glucose = 180 g mol$^{-1}$)

The van't Hoff factor for 0.5 m aqueous CH₃COOH solution is 1.075. What is the experimentally observed $\Delta T_f$ (in K) for this solution? $ K_f = 1.86 \, \text{K kg mol}^{-1} $

The following graph is obtained for an ideal solution containing a non-volatile solute. $x$- and $y$-axes represent, respectively

In which of the following, complex ions are not in correct order with respect to their magnitude of crystal field splitting?

Match the following:

List-I (Complex)	List-II (Isomerism)
A) [Co(NH₃)₅Br]SO₄	V) Ionization
B) [Co(en)₃]³⁺	I) Optical
C) [Co(NH₃)₅(NO₂)]²⁺	II) Linkage
D) [Co(NH₃)₃Cl₃]	III) Geometrical

Match the following

The correct answer is:

The volume (in mL) of 10 volume $H_2O_2$ solution required to completely react with 200 mL of 0.4 M $KMnO_4$ solution in acidic medium is

The carboxylic acid with highest $pK_a$ and lowest $pK_a$ values of the following respectively are:

4 mL of 'X volume' $ \text{H}_2\text{O}_2 $ on heating gives 80 mL of oxygen at STP. The value of X is

Identify the correct statements from the following
I.
All alkaline earth metals give hydrides on heating with hydrogen.
II.
Calcium hydroxide is used to purify sugar.
III.
$ \mathrm{BeCl_2} $ is a dimer in gaseous phase.

What are the mole fractions of glucose and water respectively, in 20% (w/w) aqueous glucose solution? ($C = 12\,u$; $O = 16\,u$; $H = 1\,u$)

The osmotic pressure of 0.01 molar solution of an electrolyte is found to be 0.65 bar at 27°C. The van’t Hoff factor of the electrolyte is (R = 0.083 bar L K$^{-1}$ mol$^{-1}$)

At 298 K, liquid A (solute) forms an ideal solution with liquid B (solvent). The following graph is obtained for this solution.

Identify the correct statements about this graph:
I) x-axis represents the mole fraction of A
II) Point Z represents the vapour pressure of pure solvent
III) x-axis represents the mole fraction of B

The mole fractions of glucose and water in aqueous glucose solution are 0.0244 and 0.9756 respectively. What is the weight percentage (w/w) of glucose in this solution?

At T(K), the vapour pressure of an aqueous solution of a non-volatile solute,
whose mole fraction is 0.02 is found to be 34.65 mm Hg.
What is the vapour pressure (in mm Hg) of pure water at the same temperature?

What is the number of moles in 88 grams of carbon dioxide (CO₂)?

1 mole of an ideal gas is allowed to expand isothermally and reversibly from 1L to 5L at 300 K. The change in enthalpy (in kJ) is
(R = 8.3 J K$^{-1}$ mol$^{-1}$)

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

A → P is a first order reaction. The reaction was started at 10.00 AM. At 10.10 AM, the concentration of A was x mol L^-1. At 10.20 AM, the concentration of A was y mol L^-1. The half life (in min) of the reaction is equal to:

For a first-order reaction, the ratio between the time taken to complete $\frac{3}{4}$th of the reaction and time taken to complete half of the reaction is

For the reaction $ \text{N}_2(g) + 3\text{H}_2(g) \rightleftharpoons 2\text{NH}_3(g) $ at 298 K, the enthalpy change $ \Delta H = -92.4 \, \text{kJ/mol} $. What happens to the equilibrium when temperature is increased?