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 1.657 g. What is the atomic weight of X?

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. What is the value of x?   (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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A sample of phosphorus that weights 12.4 g exerts a pressure 8 atm in a 0.821 litre closed vessel at 527°C. The molecular formula of the phosphorus vapour is:

1.  P2

2.  P4

3.  P6

4.  P8

Subtopic:  Ideal Gas Law |
 81%
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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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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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What is the molar mass of diacidic organic Lewis base (B), if 12 g of chloroplatinate salt BH2PtCl6 on ignition produced 5 gm residue of Pt?

1.  52

2.  58

3.  88

4.  None of these

Subtopic:  Moles, Atoms & Electrons |
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What volume of O2g measured at 1 atm and 273 K will be formed by action of 100 mL of 0.5 N KMnO4 on hydrogen peroxide in an acid solution? The skeleton equation for the reaction is
KMnO4+H2SO4+H2O2 K2SO4+MnSO4+O2+H2O

1.  0.12 litre

2.  0.028 litre

3.  0.56 litre

4.  1.12 litre

Subtopic:  Millimole/Equivalent Concept |
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Cisplatin, an anticancer drug, has the molecular formula PtNH32 Cl2. What is the mass (in gram) of one molecule? (Atomic weights : Pt=195, H=1.0, N=14, Cl=35.5)

1.  4.98×10-21

2.  4.98×10-22

3.  6.55×10-21

4.  3.85×10-22

Subtopic:  Moles, Atoms & Electrons |
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The conversion of oxygen to ozone occurs to the extent of 15% only. The mass of ozone that can be prepared from 67.2 L oxygen at 1 atm and 273 K will be:

1. 14.4 gm

2. 96 gm

3. 640 gm

4. 64 gm

Subtopic:  Moles, Atoms & Electrons |
 62%
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