What volume of (dm³) of water will be added to 10dm³ of 2.0 mol/dm³ HCL acid solution to give a final solution of 0.5 mol/dm³?

• A. 30
• B. 40
• C. 20
• D. 50

What volume of water is produced when a mixture of 150cm³ of hydrogen and 100cm³ of oxygen is exploded in a eudiometer?

• A) 250cm³
• B) 150cm³
• C) 100cm³
• D) 50cm³

Why is the hydrogen gas not found in the atmosphere? It readily reacts with

• A) Carbon (IV) oxide
• B) Oxygen
• C) Nitrogen
• D) carbon (II) oxide

What quantity of copper will be deposited by the same quantity of electricity that deposited 9.0g of aluminum? (A = 27, Cu = 64)

• A. 64g
• B. 32g
• C. 7.1g
• D. 6.4g

How many Faraday of electricity are required to deposit 0.20 mole of nickel, if 0.10 Faraday of electricity deposited 2.98g of nickel during electrolysis of its aqueous solution? (Ni = 58.7, 1F = 96 500 C mol-)

• A. 0.20
• B. 0.30
• C. 0.40
• D. 0.50

9.60 g of a gas X occupies the same volume at 0.30 g of hydrogen under the same conditions. Calculate the molar mass of X [H = 1]

• A. 8gmol^-1
• B. 16gmol^-1
• C. 32g^-1
• D. 64g mol^-1

The addition of water to calcium oxide leads to?

• A. a physical change
• B. a chemical change
• C. the formation of a mixture
• D. an endothermic change

Calcium atom ionizes by

• A. gaining two electrons
• B. losing two electrons
• C. sharing two electrons
• D. gaining two protons

The industrial preparation of hydrogen gas from water gas is referred to as

• A) Bosch process
• B) Contact process
• C) Haber process
• D) Bayer Process

Which of the following statements about the standard hydrogen electrode is not correct?

• A. The hydrogen gas is at a pressure of 1 atmosphere
• B. A solution containing 1 mol dm-3 of H⁺_(aq) ions is used
• C. A platinum electrode is used
• D. The temperature is kept at 20^OC