Sodium chloride may be obtained from brine by

A. titration

B. decantation

C. distillation

D. evaporation

E. sublimation

20 cm ³ of hydrogen gas are sparked with 20cm ³ of oxygen gas in an endimoeter at 373k (100 ^oC) and 1 atmosphere. The resulting mixture is cooled to 298 K (25 ^oC) and passed over calcium chloride. The volume of the residual gas is

A. 40 cm ³

B. 20 cm ³

C. 30 cm ³

D. 10cm ³

E. 5cm ³

For the reaction NH4NO2 \(\to\) N2 + 2H2O, calculate the volume of nitrogen that would be produced at S. T. P from 3.2 g of the dioxonitrate(iii)salt. (Relative atomic masses: N = 14, O = 16, H = 1)

A. 2.24 dm ³

B. 2.24 cm³

C. 12³

D. 12dm ³

E. 48 dm ³

A molar solution of caustic soda is prepared by dissolving

A. 40 g NaOH in 100 g of water

B. 40 g NaOH in 1000 g of water

C. 20 g NaOH in 500 of solution

D. 20 g NaOH in 1000 g of solution

E. 2o g NaOH in 80 g of solution

Which among the elements 1. Carbon 2. Oxygen 3. Copper 4. Bromine 5. Zinc, will NOT react with either water or steam?

A. 1 and 2

B. 2 and 3

C. 3 and 4

D. 1, 2, and 3

E. 2, 3, and 5

Naphthalene when heated melts at 354 K (81 ^oC). At this temperature the molecules of naphthalene

A. decompose into smaller molecules

B. change their shape

C. are oxidized by atmospheric oxygen

D. contract

E. become mobile as the inter molecular forces are broken

The ratio of the number of molecules in 2g of hydrogen to that in 16g of oxygen is

A. 2:1

B. 1:1

C. 1:2

D. 1:4

E. 1:8

The balanced equation for the reaction of tetraoxosulphate(VI)acid with aluminium hydroxide to give water and aluminium tetraoxosulphate(VI) is

A. H₂SO₄ + Al(OH)₂ \(\to\) 2H₂O + AlSO₄

B. 3H₂SO₄ + 2Al(OH)₃ \(\to\) 6H₂O + Al₂(SO₄)₃

C. 3H₂SO₄ + 2AlH \(\to\) 6H₂O + Al(SO₄)₃

D. 3H₂ SO₄ + 2Al(OH)₃ \(\to\) Al(SO₄)₃

E. H₂SO₄ + Al(OH)₃ \(\to\) H₂O + Al₂(SO₄)₃

Which of the following mixtures would result in a solution of pH greater than 7?

A. 25.00 cm³ of 0.05 M H₂SO₄ and 25.00cm³ of 0.50 M Na₂CO₃

B. 25.00 cm³ of 0.05 M H₂SO₄ and 25.00 cm³ of 0.10 M NaHCO₃

C. 10 M NaOH

D. 25.00cm³ of 0.11 MH₂ SO₄ and 50.00 cm³ of 0.05 M NaOH

E. 25.00cm³ of 0.25 M H₂SO₄ and 50.00cm³ of 0.20 M NaOH