The oxidation number of boron in NaBH₄ is

• A) -3
• B) -1
• C) +1
• D) +3

The products of the electrolysis of dilute sodium chloride solution with platinum electrodes are

• A) hydrogen and oxygen
• B) oxygen and chlorine
• C) chlorine and water
• D) sodium amalgam and chlorine

Which of the following sets of elements are arranged in order of decreasing atomic size in the Periodic Table?

• A.₆C,₄Be,₇N,₈O
• B.₄Be,₆C,₇ N,₈ O
• C.₈O,₇N,₆C,₄Be
• D.₇N,₈O,₆C,₄Be

Consider the reaction represented by the equation: Ca(OH)₂(aq) + CO₂(g) → CaCO₃(s) + H₂O(l) in the reaction above, CO₂ acts as

• A. an acidic oxide
• B. an oxidizing agent
• C. a basic oxide
• D. a dehydrating agent

One of the characteristics of transition metals is

• A. reducing ability
• B. ductility
• C. ability to conduct electricity
• D. formation of coloured ions

The products of the thermal decomposition of ammonium trioxonitrate(v) are?

• A. Nitrogen (I) Oxide and Water
• B. Ammonia and Oxide
• C. Nitrogen and Water
• D. Nitrogen (IV) Oxide and Water

In which of the following series are the atoms arranged in order of increasing ionization energy?

• A. Li, Na K
• B. B, Be, Li
• C. O, F, Ne
• D. Be, Mg, Ca

Ethyne, Ethene, Cyclohexane and Propene can be classified as _______

• A) alkenes
• B) aromatic compounds
• C) saturated compounds
• D) multiple bond hydrocarbons

What is the mass number of an element having 20 neutrons, 15 protons and 15 electrons?

• A. 15
• B. 30
• C. 35
• D. 50

Which of the following compounds is the least soluble in water?

• A. CaCl2
• B. CaSO4
• C. NaCl
• D. Na2SO4