A metal oxide is reduced by heating it in a stream of hydrogen. It is found that after complete reduction, 3.15 g of the oxide have yielded 1.05g of the metal. We may deduce that:

1. the atomic mass of the metal is 8

2. the atomic mass of the metal is 4

3. the equivalent mass of the metal is 4

4. the equivalent mass of the metal is 8

Subtopic:  Equivalent Weight |
 65%
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An oxide of metal has 20% oxygen, the equivalent mass of oxide is:

1. 32 

2. 40

3. 48

4. 52

Subtopic:  Equivalent Weight |
 55%
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How much water is to be added to dilute 10 mL of 10N HCl to make it decinormal?

1. 990mL

2. 1010 mL

3. 100mL

4. 1000mL

Subtopic:  Equivalent Weight |
 57%
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W1 g of an element combines with oxygen forming W2 g of its oxide. The equivalent mass of the element is:

1. [W1 / W2]x8

2. [W1 / W2-W1]x8

3. [W2-W1/W1 ]x8

4. [W1 / W1-W2]x8

Subtopic:  Equivalent Weight |
 65%
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The normality of 4% (mass/Vol.) NaOH is:

1. 0.1

2. 1.0

3. 0.05

4. 0.01

Subtopic:  Equivalent Weight |
 62%
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The number of peroxide linkages in CrO5 is /are

1. One

2. Two

3. Three

4. None of the above

Subtopic:  Oxidizing & Reducing Agents |
 74%
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Conversion of PbSO4 to PbS is:

1. Reduction of S

2. Oxidation of S

3. Dissociation

4. None of the above

Subtopic:  Oxidizing & Reducing Agents |
 78%
From NCERT
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An aqueous solution of SO2 reacts with H2S to precipitate sulfur. Here SO2 acts as:

1. Catalyst

2. Reducing agent

3. Oxidising agent

4. Acid

Subtopic:  Balancing of Equations | Redox Titration & Type of Redox |
 68%
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Redox reaction among the following is -

1. NaCl + KNO3 NaNO3 + KCl

2. CaC2O4 + 2HCl CaCl2 + H2C2O4

3. Mg(OH)2 + 2NH4Cl MgCl2 + 2NH4OH

4. Zn + 2AgCN 2Ag + Zn(CN)2

Subtopic:  Introduction to Redox and Oxidation Number | Redox Titration & Type of Redox |
 77%
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Reaction that represents reduction of hydrogen is -

1. Carbon Monoxide + Copper Oxide  Carbon Dioxide + Copper

2. Copper Oxide + Hydrochlorid Acid  Water + Copper Chloride

3. Steam + Iron Hydrogen + Iron oxide

4. Hydrogen+ Iron Oxide  Water + Iron

Subtopic:  Oxidizing & Reducing Agents |
 74%
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