Correct Answer: A. pessimistic

Correct Answer: B. Martha and Mary

Correct Answer: C. moon is between the sun and the earth

Correct Answer: B) low freezing point

Correct Answer: A) 2.50

Explanation

Potassium trioxochlorate(V) has the chemical formula KClO₃. When it decomposes, it produces potassium chloride (KCl) and oxygen gas (O₂). The balanced chemical equation for this decomposition reaction is:

\(2KClO_3 \rightarrow 2KCl + 3O_2\)

From the balanced equation, we can see that 2 moles of potassium trioxochlorate(V) decompose to produce 3 moles of oxygen molecules. We are given that 2.5 moles of potassium trioxochlorate(V) decompose. To find the number of moles of oxygen molecules produced, we can use the stoichiometry of the balanced equation:

\(\frac{3 \, moles \, of \, O_2}{2 \, moles \, of \, KClO_3} = \frac{x \, moles \, of \, O_2}{2.5 \, moles \, of \, KClO_3}\)

To solve for x, which represents the number of moles of oxygen molecules produced, we can cross-multiply and divide:

\(x = \frac{3 \, moles \, of \, O_2 \times 2.5 \, moles \, of \, KClO_3}{2 \, moles \, of \, KClO_3} = 2.50 \, moles \, of \, O_2\)

Therefore, 2.50 moles of oxygen molecules would be produced from the decomposition of 2.5 moles of potassium trioxochlorate(V), making Option A the correct choice.

Correct Answer: D. decreasing

Explanation

(a)Reasons road transport would be preferred to rail transport:

• Road transport is flexible and offers door to door delivery than rail transport.
• The maintenance cost of motor vehicle is much less than that of trains.
• Road transport is available for use at any time while train operates on schedule;
• Road transport covers everywhere while train moves on fixed routes;
• It is easier for an individual to own a means of road transport than rail transport;
• Road transport covers varieties of means of transport e.g. buses, cars, taxis, bicycles, while rail transport is restricted to train.

(b)Functions of the Airport Authority:

• The airport authority provides facilities for landing and fueling in all airports;
• It maintains facilities in all airports in the country;
• The airport authority collects airport taxes;
• The authority is in charge of the operation of the control tower;
• The authority sees to the environmental sanitation of the airport;
• It makes sure that the air space is free for the movement of aircrafts;
• The airport authority makes available warehouses in the airport where luggages are kept;
• It provides packing spaces for vehicles;
• It provides security services for passengers and cargoes;
• it provides office accommodation for other airport operatives

Correct Answer: A. within

Correct Answer: A. N35m