Chemistry Past Questions and Answers

The bleaching action of chlorine is through the process?

A Hydration
B Hydrolysis
C Reduction
D Oxidation

Question 1552:

If 6.5g of magnesium ribbon reacts completely with Hydrochloric acid, how many grams of hydrogen gas would be liberated?
Mg(s) + 2 HCl(aq) --> MgCl 2(aq) + H 2(g)
[ H = 1.0, Mg = 24.0 ]

A 0.54g
B 0.70g
C 1.08g
D 1.40g

Question 1553:

Calcium and magnesium belong to the group of the periodic table because both?

A Are metals
B Form cations
C Form colourless salts
D Have same number of valence electrons

Question 1554:

Which of the substances is non-polar?

A Bromine
B Ammonia
C Water
D Hydrogen Bromide

Question 1555:

Which of the following pairs of components have the same molecular mass?
[ H = 1.0, C = 12.0, O = 16.0 ]

A Ethene and Ethyne
B Ethane and Ethene
C Carbon (ii) Oxide and Ethene
D Carbon (iv) Oxide and Ethyne