Ammonium chloride can be separated from its mixture with common salt by

• A) Distillation
• B) Evaporation
• C) Decantation
• D) Sublimation

The heat of reaction can be determined experimentally using a device called a

• A. Calorimeter
• B. Barometer
• C. Spectrometer
• D. Thermometer

What mass of copper will be deposited by the liberation of Cu²⁺ when 0.1F of electricity flows through an aqueous solution of a copper (ll) salt? [Cu = 64]

• A. 64g
• B. 32g
• C. 12.8g
• D. 3.2g

Which of the following materials is classified as a non-biodegradable pollutant?

• A. Animal hide
• B. Paper
• C. Plastic
• D. Wood

A given amount of gas occupies 10.0 dm3 at atm, and 273°C. The number of moles of the gas present is? (Molar volume of a gas at s.t.p. = 22.4 dm3)

• A. 0.89 mol
• B. 1.90 mol
• C. 3.80 mol
• D. 5.70 mol

When sodium trioxocarbonate (IV) decahydrate loses its water of crystallization to the atmosphere, the process is

• A) deliquescence
• B) efflorescence
• C) hygroscopic
• D) effervesecence

When sucrose is warmed with Fehling's solution

• A. a silver mirror is produced
• B. the solution turns milky
• C. a brick-red precipitate is formed
• D. there is no precipitate

Which of the following characteristics is common to Amoeba and Paramecium?

• A. Oral groove
• B. Trichocyst
• C. Contractile vacuole
• D. Cilia

What is the solubility of a salt X at 25ºC if the saturated solution of the salt contains 0.28g in 100cm3 of the solution in mol\dm³? [ X = 56.0g ]

• A. 0.05
• B. 0.10
• C. 2.60
• D. 2.80

a. A compound contains 52.2% C, 13.1 % H and Oxygen only. The vapour density of the compound is 23.

Determine i. its empirical formula; ii. its molecular formula, [H=1.0, C=12.0, O= 16.0]

iii1). The compound reacts with sodium metal to produce hydrogen gas and when warmed with acidified \(KMnO_{4(aq)}\) gives a solution that turns from purple to colorless. It also forms a sweet-smelling liquid when heated with ethanoic acid in the presence of concentrated \(H_2SO_4\)

name the functional group present in the compound; iii2). draw the structural formula of the compound.

b. Outline the chemical equations for the production of ethanol from cooked cassava.

ci. Explain briefly why a piece of aluminum does not react with water.

ii. How can a pure sample of aluminum chloride crystals be prepared from aluminium

d. Describe how water can be separated from aqueous \(CuSO_4\)