0.7 g of Na2CO3.xH2O were dissolved in water and the volume was made to 100mL, 20mL of this solution required 19.8 mL of N/10 HCl for complete neutralization. The value of x is:
1. 7
2. 3
3. 2
4. 5
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