The ratio of the concentration of salt and acid for preparing a buffer solution of pH 6 by mixing sodium acetate and acetic acid will be: (Ka=10-5)

1. 1:10

2. 10:1

3. 100:1

4. 1:100

Subtopic:  Buffer |
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The strongest Bronsted base among the following ions is

1. CH3O-

2. (CH3)2CHO-

3. C2H5O-

4. (CH3)3CO-

Subtopic:  Acids & Bases - Definitions & Classification |
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The degree of ionization of water was found to be 1.8×10-9. The Ka (ionization constant) of water is

1. 1.8×10-9

2. 1.8×10-16

3. 1.8×10-14

4. cannot be calculated

Subtopic:  Ionisation Constant of Acid, Base & Salt |
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The decreasing order of acidic nature of H2SO4 (I), H3PO4 (II), and HClO4 (III) is

1. I>II>III

2. I>III>II

3. III>I>II

4. III>II>I

Subtopic:  Acids & Bases - Definitions & Classification |
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The number of H+ ions present in 1cm3 of a solution whose pH is 10 is

1. 10-10

2. 10-13

3. 6.02×1010

4. 6.02×1013

Subtopic:  pH calculation |
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The Ka value of formic acid and acetic acid are respectively 1.77×10-4 and 1.75×10-5. The ratio of the acid strength of 0.1 N acids is

1. 0.1

2. 0.3

3. 3.178

4. 100

Subtopic:  Ionisation Constant of Acid, Base & Salt |
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ZnS is not precipitated by passing H2S in an acidic medium but CuS is precipitated. The reason for it is

1. Ksp CuS<<Ksp ZnS

2. Ksp CuS>>Ksp ZnS

3. Ksp CuS=Ksp ZnS

4. None of these

Subtopic:  Solubility Product |
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Consider the following acids:

I. HCN

II. CH3COOH

III. HCOOH

IV. Cl-CH2COOH

The correct order of strength is

1. II>III>I>IV

2. IV>II>III>I

3. IV>III>II>I

4. III>II>IV>I

Subtopic:  Acids & Bases - Definitions & Classification |
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The hydrogen ion concentration is 0.2 M ethanoic acid (KC=2×10-5 mol dm-3) is approximately

1. 10-4

2. 2×10-2

3. 2×10-6

4. 2×10-3

Subtopic:  Ionisation Constant of Acid, Base & Salt |
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The pH of a solution made by mixing 50 mL of 0.01 M barium hydroxide solution with 50 mL of H2O is

1. 3.0 2. 6.0
3. 12.0 4. 15.0
Subtopic:  pH calculation |
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