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.  ${\mathrm{P}}_{2}$

2.  ${\mathrm{P}}_{4}$

3.  ${\mathrm{P}}_{6}$

4.  ${\mathrm{P}}_{8}$

Difficulty Level:

What volume of air at 1 atm and 273 K containing 21% of oxygen by volume is required to completely burn sulphur $\left({\mathrm{S}}_{8}\right)$ present in 200 g of sample, which contains 20% inert material which does not burn. Sulphur burns according to the reaction

1.  23.52 litre

2.  320 litre

3.  112 litre

4.  533.33 litre

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Difficulty Level:

Phosphoric acid $\left({\mathrm{H}}_{3}{\mathrm{PO}}_{4}\right)$ prepared in a two step process.

(1)
(2)

We allow 62g of phosphorus to react with react with excess oxygen which form ${\mathrm{P}}_{4}{\mathrm{O}}_{10}$ in 85% yield. In the step (2) reaction 90% yield of ${\mathrm{H}}_{3}{\mathrm{PO}}_{4}$ is obtained. Produced mass of ${\mathrm{H}}_{3}{\mathrm{PO}}_{4}$ is:

1.  37.485 g

2.  149.949 g

3.  125.47 g

4.  564.48 g

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Difficulty Level:

100 mL of ${\mathrm{H}}_{2}{\mathrm{SO}}_{4}$ solution having molarity 1M and density 1.5 g/mL is mixed with 400 mL of water. Calculate final molarity of ${\mathrm{H}}_{2}{\mathrm{SO}}_{4}$ 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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Difficulty Level:

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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Difficulty Level:

What is the molar mass of diacidic organic Lewis base (B), if 12 g of chloroplatinate salt $\left({\mathrm{BH}}_{2}{\mathrm{PtCl}}_{6}\right)$ on ignition produced 5 gm residue of Pt?

1.  52

2.  58

3.  88

4.  None of these

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Difficulty Level:

Equivalent weight of ${\mathrm{FeS}}_{2}$ in the half reaction,  is:

1.  M/10

2.  M/11

3.  M/6

4.  M/1

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Difficulty Level:

The equivalent weight of $\mathrm{HCl}$ in the given reaction is:

1.  16.25

2.  36.5

3.  73

4.  85.1

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Difficulty Level:

Equivalent weight of ${\mathrm{H}}_{3}{\mathrm{PO}}_{2}$ when it disproportionate into ${\mathrm{PH}}_{3}$ and ${\mathrm{H}}_{3}{\mathrm{PO}}_{3}$ is:

1.  M

2.  M/2

3.  M/4

4.  3M/4

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Difficulty Level:

What volume of ${\mathrm{O}}_{2}\left(\mathrm{g}\right)$ 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
$\to {K}_{2}S{O}_{4}+MnS{O}_{4}+{O}_{2}+{H}_{2}O$

1.  0.12 litre

2.  0.028 litre

3.  0.56 litre

4.  1.12 litre