The degree of dissociation of water in a 0.1 M aqueous solution of HCl at a certain temperature t°C is 3.6 x 10–15. The temperature t must be :

(1) < 25°C

(2) = 25°C

(3) > 25°C

(4) insufficient data to predict

Subtopic:  Introduction To Equilibrium |
 51%
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

Which one is the correct expression below for the solution containing 'n' number of weak acids?

(1) [H+]=i=1nKiCi

(2) [H+]=i=1nKiCi

(3) [H+]=i = 1nKiCi

(4) none of these

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 75%
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

The pH of glycine at the first half equivalence point is 2.34 and that at second half equivalence point is 9.60.At the equivalence point (The first inflection point) The pH is :

(1) 3.63

(2) 2.34

(3) 5.97

(4) 11.94

Subtopic:  pH calculation |
 66%
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

A 1.458 g of Mg reacts with 80.0 ml of a HCI solution whose pH is –0.477. The change in pH after all Mg has reacted. (Assume constant volume. Mg = 24.3 g/mol.)(log 3 = 0.477)

(1) –0.176

(2) +0.477

(3) –0.2385

(4) 0.3

Subtopic:  pH calculation |
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

Find the pH (initial pH –final pH) when 100 ml 0.01 M HCl is added in a solution containig 0.1 m molesof NaHCO3 solution (pH = 9 ) of negligible volume ( Kai =10–7, Ka, =10–11 for H2CO3) :

(1) 6 + 2 log3

(2) 6 – log3

(3) 6 + 2 Log2

(4) 6 – 2 log3

Subtopic:  pH calculation |
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh

The ionization constant of benzoic acid is 6.46 x 10–5 and Kc for silver benzoate is 2.5 x 10–13. How many times silver benzoate is more soluble in a buffer of pH = 3.19 as compared to its solubility in pure water ?

(1) 3.317

(2) 9.5

(3) 1000

(4) 7.5

Subtopic:  Introduction To Equilibrium |
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

30 ml of 0.06 M solution of the protonated form of an anion acid methionine (H2A+) is treated with 0.09 M NaOH. Calculate pH after addition of 20 ml of base. pKa1, = 2.28 and pKa2 = 9.2.

1. 5.5

2. 5.74

3. 9.5

4. None

Subtopic:  pH calculation |
 70%
From NCERT
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Hints

A certain acid–base indicator is red in acid solution and blue in basic solution 75% of the indicator is presentin the solution in its blue form at pH = 5. Calculate the pH at which the indicator shows 90% red form?

(1) 3.56

(2) 5.47

(3) 2.5

(4) 7.4

Subtopic:  Salt Hydrolysis & Titration |
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

Ionisation constant of HA (weak acid) and BOH (weak base) are 3.0 x 10–7 each at 298K. The percent degree of hydrolysis of BA at the dilution of 10L is :

1. 25

2. 50

3. 75

4. 40

Subtopic:  Salt Hydrolysis & Titration |
 51%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints

Calculate the molar solubility of zinc tetrathiocyanato–N–mercurate (II) if its Ksp = 2.2 x 10–7.

(1) 0.00380

(2) 0.000469

(3) 0.0095

(4) 0.0183

Subtopic:  Solubility Product |
 72%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
Hints
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh