What volume of 11.0 M hydrochloric acid must be dilute to obtain 1 dm3 of 0.05 M acid?

• A. 0.05 dm3
• B. 0.10 dm3
• C. 0.55 dm3
• D. 11.0 dm3

Graphite is used as a dry lubricant due to the presence of

• A. mobile electrons
• B. free electrons
• C. octahedral structures
• D. layered structures

2H2 + O22 → H2+O ΔH = -571kJ In the equation above, how much heat will be liberated if 12.0g of hydrogen is burnt in excess oxygen?

• A. -1142 kJ
• B. -571 kJ
• C. +1142 kJ
• D. -1713 kJ

The Bohr model of the atom proposed the existence of?

• A. the nucleus
• B. electron shells
• C. nucleons
• D. neutrons

200 cm3 of air was passed over heated copper in a syringe several times to produce copper (II) oxide. When cooled, the final volume of air recorded was 158cm3. Estimate the percentage of oxygen in the air?

• A. 31%
• B. 27%
• C. 21%
• D. 19%

What volume of oxygen is produced from the decomposition of 2 mole of KCIO3 at s.t.p? [Molar volume of a gas at s.t.p = 22.4 dm3]

• A. 22.4 dm3
• B. 33.6 dm3
• C. 44.8 dm3
• D. 67.2 dm3

How many moles of HCl will be required to react with potassium heptaoxodichromate (VI) to produce 3 moles of chlorine?

• A) 14
• B) 12
• C) 11
• D) 10

What is the percentage by mass of H in CH₃COOH

• A. 1.7%
• B. 5.0%
• C. 6.7%
• D. 7.1%

The alkanol obtained from the production of soap is

• A) propanol
• B) ethanol
• C) glycerol
• D) methanol

Liquid oxygen may be produced by condensation of air using this coolant

• A) liquid phosphorus
• B) liquid gas
• C) liquid paraffin
• D) liquid nitrogen