An oxide of metal has 20% oxygen, the equivalent mass of oxide is:

1. 32 

2. 40

3. 48

4. 52

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

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

The normality of 4% (mass/Vol.) NaOH is:

1. 0.1

2. 1.0

3. 0.05

4. 0.01

The number of peroxide linkages in CrO₅ is /are

1. One

2. Two

3. Three

4. None of the above

Conversion of PbSO₄ to PbS is:

1. Reduction of S

2. Oxidation of S

3. Dissociation

4. None of the above

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

Redox reaction among the following is -

1. NaCl + KNO₃ $\to$NaNO₃ + KCl

2. CaC₂O₄ + 2HCl $\to$CaCl₂ + H₂C₂O₄

3. Mg(OH)₂ + 2NH₄Cl $\to$MgCl₂ + 2NH₄OH

4. Zn + 2AgCN $\to$2Ag + Zn(CN)₂

Reaction that represents reduction of hydrogen is -

1. Carbon Monoxide + Copper Oxide $\to$ Carbon Dioxide + Copper

2. Copper Oxide + Hydrochlorid Acid $\to$ Water + Copper Chloride

3. Steam + Iron $\to$Hydrogen + Iron oxide

4. Hydrogen+ Iron Oxide $\to$ Water + Iron

The oxidation number of Fe in K₃[Fe(CN)₆] is-

1. +2

2. +3

3. +4

4. +1