Which of the following is the electronic configuration of sodium?
(Atomic number of Na = 11)

A. 1s² 2s²2p⁶ 3s²

B. 1s² 2s²2p⁶ 3s² 3p1s² 2s²2p⁶ 3s¹

C. 1s² 2s²2p⁶ 3s¹

D. 1s² 2s²2p⁶ 3s^°

E. 1s² 2s²2p⁶ 4s¹

In the reaction of oxygen with hydrogen to produce water, which of the following statements is true?

A. One atom of hydrogen reacts with two atoms of oxygen to give one molecule of water

B. Two atoms of hydrogen react with two atoms of oxygen to give two molecules of water

C. One molecule of oxygen reacts with one molecule of hydrogen to give two molecules of water

D. One molecule of hydrogen reaccts with two molecules of oxygen to give three molecules of water

E. One molecule of oxygen reacts with two molecules of hydrogen to give two molecules of water

Na₂CO₃ + 2HCI → 2NaCI + H₂O + CO₂. Using the above equation, what volume of carbondioxide, measured at s.t.p is liberated when 53g of sodium carbonate is dissolved in hydrochloric acid?
(1 mole of gas occupies 22.4 dm³ at s.t.p)
(Na = 23, C = 12, O = 16)

A. 44.8 dm³

B. 11.2 dm³

C. 100.1 dm³

D. 3.0 dm³

E. 22.4 dm³

When sodium nitrate dissolves in water, ∆H is positive. This means that?

A. the reaction is catalysed

B. the reaction is complete

C. the reaction is exothermic

D. the reaction is endthermic

E. sodium nitrate is highly soluble in water

If an organic compound decolorizes bromine water then the compound is?

A. saturated

B. supersaturated

C. unsaturated

D. a solid

E. protonated

When air is compressed?

A. its density decreases

B. it solidifies

C. its temperature decreases

D. its temperature increases

E. its temperature remains unchanged

Fats and oils are?

A. addition products of long chain fatty acids and alkali

B. addition products of long-chain fattyy acids and glycerol

C. condensation products of long-chain fatty acids and glycerol

D. condensation products of formaldehyde and glycerol

E. liquids at 20°C

Which of the following statements about phosphorus is NOT correct?

A. Phosphorus is a solid mineral

B. Phosphorus is obtained by oxidation reaction of phosphate

C. Phosphorus exists in two allotropic forms

D. Both forms of phosphorus are interconvertible

E. Yellow phosporus ignites when rubbed on a rough surface

28.8 cm³ of nitrogen at 15°C is cooled to O°C at constant pressure, the new volume of nitrogen is?

A. 17.4 cm³

B. 14.7 cm³

C. 27.3 cm³

D. 31.7 cm³

If 48,000 coulombs of electricity are required to discharge 0.5 mole of sodium from a molten sodium chloride mass, then the number of coulombs required to discharge 2 moles of lead from molten lead (ll) chloride is?

A. 48,000

B. 96,000

C. 192,000

D. 384,000

E. 576,000