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

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What volume of air at 1 atm and 273 K containing 21% of oxygen by volume is required to completely burn sulphur S8 present in 200 g of sample, which contains 20% inert material which does not burn. Sulphur burns according to the reaction

                                    18S8s+O2g  SO2g

1.  23.52 litre

2.  320 litre

3.  112 litre

4.  533.33 litre

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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

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100 mL of H2SO4 solution having molarity 1M and density 1.5 g/mL is mixed with 400 mL of water. Calculate final molarity of H2SO4 solution, if final density is 1.25 g/mL:

1.  4.4 M

2.  0.145 M

3.  0.52 M

4.  0.277 M

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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

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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

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Equivalent weight of FeS2 in the half reaction, FeS2  Fe2O3+SO2 is:

1.  M/10

2.  M/11

3.  M/6

4.  M/1

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The equivalent weight of HCl in the given reaction is: K2Cr2O7+14HCl  2KCl+2CrCl3+3Cl2+H2O

1.  16.25

2.  36.5

3.  73

4.  85.1

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Equivalent weight of H3PO2 when it disproportionate into PH3 and H3PO3 is:

1.  M

2.  M/2

3.  M/4

4.  3M/4

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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

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