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

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

A compound contains atoms of three elements A,B and C. If the oxidation number of A is +2, Bis +5 and that of C is -2, the possible formula of the compound is : 

1. A₂(BC₃)₂
2. A₃(B₄C)₂
3. A₃(BC₄)₂
4. ABC₂ 

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