Chemistry Past Questions and Answers

What is the mass of silver deposited when 24,125 C of electricity is passed through a solution or silver salt.
[Ag = 108, IF = 96,500 C ]

A 432g
B 108g
C 54g
D 27g

Question 1617:

Equal masses of calcium trioxocarbonate(iv) were added to dilute hydrochloric acid at the temperature specified. Under which of the following conditions would the reaction be slowest?

A Calcium trioxocarbonate ( iv ) chips a 20°C
B CalcIum trioxocarbonate (IV) chips at 40°C
C Calcium trioxocarbonate (IV) powder at 20'C
D Calcium trioxocarbonate (IV) powder at 40'C

Question 1618:

The high solubility of ethanol in water is due to?

A Its low boiling point.
B Its low freezing point.
C Its covalent nature
D Hydrogen bonding

Question 1619:

Which of the following pairs of properties of alkali metals decreases down the group?

A First ionization energy and reactivity
B Melting point and atomic radius
C Reactivity and electronegativity
D First ionization energy and melting point

Question 1620:

The most suitable process of obtaining water from an aqueous solution of sugar i

A Crystallization
B Distillation
C Filtration
D Decantation