Chemistry Past Questions and Answers

Which of the following gases will bleach moist litmus paper?

A CI²
B CO²
C SO²
D HCI²
E N² O

Question 67:

Given that for the reaction KOH (aq) + HCI(aq) â†’ KCI(aq) + H2O(L) H = - 54 Kj mol-1. What is the quantity of heat involved in the reaction?2NaOH(aq) + H2SO 4(aq) â†’ Na2SO4(aq) + 2H 2O(l)?

A - 108Kj
B -54 kj
C -27 kj
D +27 kj
E +54 kj

Question 68:

When an element can exist in two or more forms in the same physical state, the element is said to exhibit

A Isotopy
B Isomerism
C Allotropy
D Hygroscopy
E Sublimation

Question 69:

Which of the following carbohydrates does NOT usually occur in the crystalline form?

A Fructose
B Glucose
C Sucrose
D Maltose
E Cellulose

Question 70:

Copper can best be purified by

A Roasting the impure copper in a blast furnace
B Heating the oxide with coke
C Electrolyzing a copper (ll) salt solution using the impure copper as the anode
D Converting the impure copper to a trioxonitrate (V)
E Washing the impure copper with sodium hydroxide solution