Which of the following combinations illustrates the law of reciprocal proportions?

1.  N2O3, N2O4, N2O5

2.  NaCl, NaBr, Nal

3.  CS2, CO2, SO2

4.  PH3, P2O3, P2O5

Subtopic:  Introduction |
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Carbon and oxygen combine to form two oxides, carbon monoxide and carbon dioxide in which the ratio of the weights of carbon and oxygen is respectively      12 : 16 and 12 : 32. These figures illustrate the:

1.  Law of multiple proportions

2.  Law of reciprocal proportions

3.  Law of conservation of mass

4.  Law of constant proportions

Subtopic:  Introduction |
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The formula of an acid is HXO2. The mass of 0.0242 moles of the acid is 1.657 g.
The atomic weight of X is:

1. 35.5 2. 28.1
3. 128 4. 19.0
Subtopic:  Moles, Atoms & Electrons |
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A 6.85 g sample of the hydrates SrOH2.xH2O is dried in an oven to give 3.13 g of anhydrous SrOH2. The value of x is - 

(Atomic weights : Sr=87.60, O=16.0, H=1.0)

1.  8

2.  12

3.  10

4.  6

Subtopic:  Moles, Atoms & Electrons | Equation Based Problem |
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The sulphate of the metal M contains 9.87% of M. This sulphate is isomorphous with ZnSO4.7H2O. The atomic weight of M is:

1.  40.3

2.  36.3

3.  24.3

4.  11.3

Subtopic:  Equation Based Problem |
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Sulphur burns according to the reaction

 18S8s+O2g  SO2g
What volume of air, at 1 atm and 273 K, containing 21%  oxygen by volume is required to completely burn sulphur S8 present in 200 g of the sample?
(This sample contains 20% inert material which does not burn)

1.  23.52 litre

2.  320 litre

3.  112 litre

4.  533.33 litre

Subtopic:  Equation Based Problem |
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Phosphoric acid H3PO4 prepared in a two step process.

(1) P4+5O2  P4O10
(2) P4O10+6H2O  4H3PO4

We allow 62g of phosphorus to react with react with excess oxygen which form P4O10 in 85% yield. In the step (2) reaction 90% yield of H3PO4 is obtained. Produced mass of H3PO4 is:

1.  37.485 g

2.  149.949 g

3.  125.47 g

4.  564.48 g

Subtopic:  Equation Based Problem |
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100 mL of H2SO4 solution having molarity of 1M and density 1.5 g/mL is mixed with 400 mL of water. The molarity of the H2SO4 solution will be: (final density is 1.25 g/mL )

1. 4.4 M 2. 0.145 M
3. 0.52 M 4. 0.227 M
Subtopic:  Moles, Atoms & Electrons |
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What volume of HCl solution of density 1.2 g/cm3 and containing 36.5% by weight HCl, must be allowed to react with zinc(Zn) in order to liberate 4.0 g of hydrogen?

1.  333.33 mL

2.  500 mL

3.  614.66 mL

4.  None of these

Subtopic:  Equation Based Problem |
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The molar mass of diacidic organic Lewis base (B), if 12 g of chloroplatinate salt BH2PtCl6 on ignition produced 5 gm residue of Pt,will be -

1.  52

2.  58

3.  88

4.  None of these

Subtopic:  Moles, Atoms & Electrons |
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