The mass of carbon anode consumed (giving only carbon dioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is (at. mass of Al = 27)

1. 180 kg

2. 270 kg

3. 540 kg

4. 90 kg

In the Haber process, 30 L of H₂ and 30 L of N₂ are allowed to react. If the reaction gives only 50% of the theoretically expected yield of NH₃, what will be the composition of the gaseous mixture at the end of the reaction?

1. 20 L ammonia, 10 L nitrogen, 30 L hydrogen

2. 10 L ammonia, 25 L nitrogen, 15 L hydrogen

3. 20 L ammonia, 20 L nitrogen, 20 L hydrogen

4. 20 L ammonia, 25 L nitrogen, 15 L hydrogen

A hydrated sodium sulphate salt, Na₂SO₄·nH₂O, loses 55% of its mass on heating to form anhydrous Na₂SO₄. What is the value of n?

The product of atomic mass and specific heat of metal is approximately 6.4. This was given by:

1. Dalton's law

2. Avogadro's law

3. Newton's law

4. Dulong Petit's law

A clay mineral initially contains 12% water and 45% silica by mass. If its water content is reduced to 8% by partial drying, what is the approximate percentage of silica in the dried sample?

What is the mole fraction of the solute in a 1.00 molal aqueous solution?

2 gm Iron pyrite (FeS₂) is burnt with O₂ to form Fe₂O₃ and SO₂. The mass of SO₂ produced is (Fe=56, S=32, O=16)

1. 2 gm

2. 2.13 gm

3. 4 gm

4. 4.26 gm

Equivalent weight of ${\mathrm{FeS}}_2$ in the half reaction, ${\mathrm{FeS}}_2<mspace\; width="1em"></mspace>\stackrel{}{\to }<mspace\; width="1em"></mspace>{\mathrm{Fe}}_2{\mathrm{O}}_3+{\mathrm{SO}}_2$ is:

1.  M/10

2.  M/11

3.  M/6

4.  M/1

The equivalent weight of $\mathrm{HCl}$ in the given reaction is: ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7+14\mathrm{HCl}<mspace\; width="1em"></mspace>\to <mspace\; width="1em"></mspace>2\mathrm{KCl}+2{\mathrm{CrCl}}_3+3{\mathrm{Cl}}_2+{\mathrm{H}}_2\mathrm{O}$

1.  16.25

2.  36.5

3.  73

4.  85.1

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