For the reaction \(A\left(g\right) \rightleftharpoons 2B\left(g\right)\), the backward reaction rate constant is higher than the forward reaction rate constant by a factor of 2500, at 1000 K.
[Given : R = 0.0831 L atm mol^-1 K^-1]K_p for the reaction at 1000 K is

(1). 0.021
(2). 83.1
(3). 2.077 × 10⁵
(4). 0.033

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

Conjugate base for Bronsted acids H₂O and HF are

(1). H₃O⁺ and F^– , respectively.
(2). OH^– and F^–, respectively.
(3). H₃O⁺ and H₂F⁺, respectively.
(4). OH^– and H₂F⁺, respectively.

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

The major product of the following reaction is


(1).
(2).
(3).
(4).

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

MY and NY₃, two nearly insoluble salts have the same K_sp values of 6.2 × 10^-13 at room temperature. Which statement would be true in regard to MY and NY₃ ?

(1). The molar solubility of MY in water is less than of NY₃
(2). The salts MY and NY₃ are more soluble in 0.5 M KY than in pure water
(3). The addition of the salt of KY to solution of MY and NY₃ will have no effect on their solubilities
(4). The molar solubilities of MY and NY₃ in water are identical

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

Phosphoric acid ionizes in three steps with their ionization constant values
\(Ka_1\), \(Ka_2\), and \(Ka_3\), respectively,while K is the overall ionization constant.
Which of the following statements are true?
A. \(\text{log} K\) = \(\text{log} Ka_1\) + \(\text{log}Ka_2\) +\(\text{log}Ka_3\)

B. \(H_3PO_4\) is a stronger acid than \(H_2PO_4^-\) and \(HPO_4^{2-}\).

С. \(Ka_1\) > \(Ka_2\) > \(Ka_3\).

D. \(\displaystyle Ka_1\,= \,\frac{Ka_3\,+\,Ka_2}{2}\).
Choose the correct answer from the options given below:

(1). A, B and C only
(2). A and B only
(3). A and C only
(4). B, C and D only

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

Higher yield of NO in
\(N_2\left(8\right)\, +\, O_2\left(g\right)\, \rightleftharpoons\, 2NO\left(g\right)\) can be obtained at
[\(\Delta H\) of the reaction = +180.7 kJ mol^-1]
A. higher temperature
B. lower temperature
C. higher concentration of N₂
D. higher concentration of O₂
Choose the correct answer from the options given below:

(1). A, C, D only
(2). A, D only
(3). B, C only
(4). B, C, D only

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

For the reaction \(2A \rightleftharpoons B + C, \, K_c \, = \, 4 \times 10^{-3}\). At a given time, the composition of reaction mixture is:
\([A]\, =\, [B]\, = \, [C]\, =\, 2 \times 10^{-3}\,M\)
Then, which of the following is correct?

(1). Reaction has a tendency to go in backward direction.
(2). Reaction has gone to completion in forward direction.
(3). Reaction is at eqilibrium.
(4). Reaction has a tendency to go in forward direction.

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

In which of the following equilibria, \(\text{K}_\text{P}\) and \(\text{K}_\text{C}\) are NOT equal?

(1). \(\text{CO}\left(\text{g}\right)\,+\,\text{H}_2\text{O}\left(\text{g}\right) \rightleftharpoons \text{CO}_2\left(\text{g}\right)\, +\, \text{H}_2\left(\text{g}\right)\)
(2). \(2\text{BrCl}\left(\text{g}\right) \rightleftharpoons \text{Br}_2\left(\text{g}\right)\, +\, \text{Cl}_2\left(\text{g}\right)\)
(3). \(\text{PCl}_5\left(\text{g}\right) \rightleftharpoons \text{PCl}_3\left(\text{g}\right)\, +\, \text{Cl}_2\left(\text{g}\right)\)
(4). \(\text{H}_2\left(\text{g}\right)\,+\,\text{I}_2\left(\text{g}\right) \rightleftharpoons 2\text{HI}\left(\text{g}\right)\)

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

Consider the following reaction in a sealed vessel at equilibrium with concentrations of
\(\text{N}_2\,=\,3.0 \times 10^{-3}\text{M}\),
\(\text{O}_2\,=\,4.2 \times 10^{-3}\text{M}\),
\(\text{NO}\,=\,2.8 \times 10^{-3}\text{M}\),
\(2\text{NO}\left(g\right)\,\rightleftharpoons\, \text{N}_2\left(g\right)\,+\, \text{O}_2\left(g\right)\),
If \( 0.1\text{molL}^{-1}\) of \(\text{NO}\left(g\right)\) is taken in a closed vessel, what will be degree of dissociation \(\left(\alpha\right)\) of \(\text{NO}\left(g\right)\) at equilibrium?

(1). 0.8889
(2). 0.717
(3). 0.00889
(4). 0.0889

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

Amonst the given options which of the following molecules/ion acts as a Lewis acid?

(1). H₂O
(2). BF₃
(3). OH^-
(4). NH₃

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

The equilibrium concentrations of the species in the reaction \(A\,+\,B\, \rightleftharpoons\, C \,+\,D\) are 2, 3, 10, and 6 mol L^-1, respectively at 300 K. \(\delta G^\circ\) for the reaction is (R = 2 cal/mol K).

(1). -137.26 cal
(2). -1381.80 cal
(3). -13.73 cal
(4). 1372.60 cal

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

The pH of the solution containing 50 mL each of 0.10 M sodium acetate and 0.01 M acetic acid is
[Given aK_a, of CH₃COOH = 4.57]

(1). 5.57
(2). 3.57
(3). 4.57
(4). 2.57

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

What mass of 95% pure CaCO₃ will be required to neutralise 50 mL of 0.5 M HCl solution according to the following reaction?

[Calculate upto second place of decimal point]

(1). 1.25 g
(2). 1.32 g
(3). 3.65 g
(4). 9.50 g

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

\(\text{3O}_2\,\left(g\right) \rightarrow\, \text{2O}_3 \left(g\right) \)
for the above reaction at 298 K, K_c is found to be \(3.0 \times 10^-{59}\). If the concentration of O₂ at equilibrium is 0.040 M then concentration of O₂ in M is

(1). \( 4.38 \times 10^{-32}\)
(2). \(1.9 \times 10^{-63}\)
(3). \(2.4 \times 10^{31}\)
(4). \(1.2 \times 10^{21}\)

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

The pK_b of dimethylamine and pk_a of acetic acid are 3.27 and 4.77 respectively at T (K). The correct option for the pH of dimethylammonium acetate solution is:

(1). 8.50
(2). 5.50
(3). 7.75
(4). 6.25

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

Which will make basic buffer ?

(1). 100 mL of 0.1 M CH₃COOH + 100 mL of 0.1 mL NaOH
(2). 100 mL of 0.1 M HCl + 200 mL of 0.1 m NH₄OH
(3). 100 mL of 0.1 M HCl + 100 mL of 0.1 M NaOH
(4). 50 mL of 0.1 period M NaOH elements + 25 mL of 0.1 M CH₃COOH

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

The compound that is most difficult to protonate is

(1).
(2).
(3).
(4).

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

For the chemical reaction
N₂(g) + 3H₂(g) \(\rightleftharpoons\) 2NH₃(g)
the correct option is

(1).
(2).
(3).
(4).

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

pH of a saturated solution of Ca(OH)₂ is 9. The solubility product (k_sp) of Ca(OH)₂ is

(1). 0.25 x 10^-10
(2). 0.125 x 10^-15
(3). 0.5 x 10^-10
(4). 0.5 x 10^-15

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations:
A. \( \text{60 mL} \frac{\text{M}}{\text{10}}\)HCl + \( \text{40 mL} \frac{\text{M}}{\text{10}}\)NaOH
B. \( \text{55 mL} \frac{\text{M}}{\text{10}}\)HCl + \( \text{45 mL} \frac{\text{M}}{\text{10}}\)NaOH
C. A. \( \text{75 mL} \frac{\text{M}}{\text{5}}\)HCl + \( \text{25 mL} \frac{\text{M}}{\text{5}}\)NaOH
D. \( \text{100 mL} \frac{\text{M}}{\text{10}}\)HCl + \( \text{100 mL} \frac{\text{M}}{\text{10}}\)NaOH
pH of which one of them will be equal to 1 ?

(1). C
(2). D
(3). A
(4). B

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

The solubility of BaSO₄ in water is 2.42 × 10^–3gL^–1 at 298 K. The value of its solubility product (K_sp) will be
(Given molar mass of BaSO4 = 233 g mol–1)

(1). 1.08 × 10^–8 mol²L^–2
(2). 1.08 × 10^–14 mol²L^–2
(3). 1.08 × 10^–12 mol²L^–2
(4). 1.08 × 10^–10 mol²L^–2

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

Which one of the following conditions will favour maximum formation of the product in the reaction,
A₂(g) + B₂(g) \(\rightleftharpoons \) X₂(g) \(\Delta_r\)H = -XkJ?

(1). High temperature and low pressure
(2). High temperature and high pressure
(3). Low temperature and low pressure
(4). Low temperature and high pressure

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

The equilibrium constants of the following are:
N₂ + 3H₂ \(\rightleftharpoons\) 2NH₃ ------ K₁
N₂ + O₂ \(\rightleftharpoons\) 2NO ------ K₂
H₂ + \(\frac{\text{1}}{\text{2}}\)O₂ \(\rightarrow \) H₂O ------ K₃
The equilibrium constant (K) of the reaction:
2NH₃ + \(\frac{\text{5}}{\text{2}}\)O₂ \(\rightleftharpoons\) 2NO + 3H₂O, will be

(1). \(\text{K}_2^3\, \text{K}_3\)/\(\text{K}_1\)
(2). \(\text{K}_1\, \text{K}_3^3\)/\(\text{K}_2\)
(3). \(\text{K}_2\, \text{K}_3^3\)/\(\text{K}_1\)
(4). \(\text{K}_2\, \text{K}_3\)/\(\text{K}_1\)

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

Concentration of the Ag+ ions in a saturated solution of Ag₂C₂O₄ is 2.2 × 10^–4mol L^–1. Solubility product of Ag₂C₂O₄ is

(1). 5.3 × 10^–12
(2). 2.42 × 10^–8
(3). 2.66 × 10^–12
(4). 4.5 × 10^–11

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

A 20 litre container at of 400 K contains CO₂(g) at pressure 0.4 atm and an excess SrO (neglect the volume of solid SrO). The volume of the containers is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of CO₂ attains its maximum value, will be
[Given : SrCO₃(s) \(\rightleftharpoons\) SrO(s) + CO₂ (g).
K = 1.6 atm]

(1). 2 litre
(2). 5 litre
(3). 10 litre
(4). 4 litre

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

The product obtained as a result of a reaction of nitrogen with CaC₂ is

(1). CaCN
(2). CaCN₃
(3). Ca₂CN
(4). Ca(CN)₂

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

Among the following , the correct order of acidity is

(1). HClO < HClO₂ < HClO3 < HClO₄
(2). HClO₂ < HClO < HClO₃ < HClO₄
(3). HClO₄ < HClO₂ < HClO < HClO₃
(4). HClO₃ < HClO₄ < HClO₂ < HClO

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02

Which of the following statements is false ?

(1). Ca²⁺ ions are important in blood clotting
(2). Ca²⁺ ions are not important in maintaining the regular beating of the heart .
(3). Mg²⁺ions are important in the green parts of plants
(4). Mg²⁺ ions form a complex with ATP

Number of Attempts: 2

Correct Attempts: 1

Time Taken: 00:04

Average Time: 00:02