The maximum number of electrons that can be accommodated in the shell having the principal quantum number 3 is

• A) 3
• B) 9
• C) 10
• D) 18

What is the percentage by mass of copper in copper in copper (l) oxide (CU₂O)? [O = 16; CU =64]

• A. 88.9%
• B. 80.0%
• C. 66.7%
• D. 20.0%

Which of the following alkaline metals react more quickly spontaneously with water?

• A) Calcium
• B) Beryllium
• C) Magnesium
• D) Strontium

The electronic configuration of an element X is 1s²2s²2p⁶3s²3p⁴. It can be deduced that X

• A. Belongs to group 6 of the Periodic Table
• B. Belongs to group IV of the Periodic Table
• C. has 3 unpaired electrons in its atom
• D. has relative molecular mass of 16

Which of the following statements is/are true?

• A. H₂SO₄ is a strong electrolyte.
• B. CH₃COO H is a weak electrolyte
• C. C₆H₁₂O₆ is a non electrolyte
• D. All of the above

The metal extracted from cassiterite is

• A) calcium
• B) copper
• C) tin
• D) sodium

How many faradays of electricity are required to deposit 216 grams of silver from a solution of silver nitrate?

• A) 1
• B) 2
• C) 3
• D) 4

30cm³ of hydrogen was collected over water at 27°C and 780 mm Hg. If the vapour pressure of water at the temperature of the experiment was 10 mm Hg, calculate the volume of the gas at 760 mm Hg and 7°C?

• A. 40.0 cm³
• B. 35.7 cm³
• C. 28.4 cm³
• D. 25.2 cm³

The following acids are monobasic except

• A. trioxonitrate (V) acid
• B. hydrochloric
• C. ethanoic acid
• D. tetraoxophosphorus (V) acid

When iron is exposed to moisture and it rusts, the value of ΔG for the reaction is

• A. neutral
• B. zero
• C. positive
• D. negative