Correct Answer: B. N250

Correct Answer: A)

C\(_3\)H\(_6\)

Explanation

To find the formula of the hydrocarbon, we need to determine its molar mass and the moles of the hydrocarbon. Since we know the mass and volume of the hydrocarbon at Standard Temperature and Pressure (S.T.P.), we can use the molar volume of a gas at S.T.P., which is 22.4 dm\(^3\), or 22,400 cm\(^3\).

First, let's find the moles of the hydrocarbon:

\[\text{moles} = \frac{\text{volume at S.T.P.}}{\text{molar volume at S.T.P.}}\]

\[\text{moles} = \frac{32 \text{ cm}^3}{22,400 \text{ cm}^3}\]

\[\text{moles} = 1.43 \times 10^{-3}\]

Now, let's find the molar mass of the hydrocarbon:

\[\text{molar mass} = \frac{\text{mass}}{\text{moles}}\]

\[\text{molar mass} = \frac{0.06 \text{ g}}{1.43 \times 10^{-3}}\]

\[\text{molar mass} \approx 42 \text{ g/mol}\]

We can now determine the empirical formula of the hydrocarbon. We know that it consists of carbon (C) and hydrogen (H) atoms. The atomic mass of carbon is 12 g/mol and the atomic mass of hydrogen is 1 g/mol. Let's use x as the number of carbon atoms and y as the number of hydrogen atoms in the formula:

\[12x + y = 42\]

We'll now consider the possible options and see which fits the equation:

Option A: C\(_3\)H\(_6\) (Correct)

In this formula, x = 3, and y = 6. The equation becomes 12(3) + 6 = 42, which is true. So, Option A is correct.

Option B: C\(_2\)H\(_2\)

In this formula, x = 2, and y = 2. The equation becomes 12(2) + 2 = 26, which is not equal to 42. So, Option B is incorrect.

Option C: C\(_2\)H\(_4\)

In this formula, x = 2, and y = 4. The equation becomes 12(2) + 4 = 28, which is not equal to 42. So, Option C is incorrect.

Option D: C\(_2\)H\(_6\)

In this formula, x = 2, and y = 6. The equation becomes 12(2) + 6 = 30, which is not equal to 42. So, Option D is incorrect.

Therefore, the correct formula for the hydrocarbon is C\(_3\)H\(_6\).

Explanation

(a) Map of Nigeria showing : (i) Major road from Lagos to Portharcourt (ii) Railway line from Lagos to Kano.

(b) Contributions of transportation to the economic development of Nigeria:

(i) Movement of people

(ii) Movement of goods

(iii) Creation of job opportunities

(iv) Promote internal trade (v) Promote

international trade (vi) Income to workers

(vii) promotes national integration (viii)

opening up new areas for development

(ix) Linkages between areas of transactions

(areas of production & areas of consumption)

(x) Revenue generation for government

(.xi) Infrastructural development

(xii) Promotion of tourism (xiii) Diffusion

of ideas' and innovations (xiv) Enhancement

of production/GNP (xv) improvement in

standard of living (xvi) Access to natural resources

(xvii) Helps in the of growth of settlement

(xviii) Ease of administration

(xix) foreign exchange earnings

(xx) Diversification of the economy.

(c) Problems limiting rail transportation ill

Nigeria: (i) Slow speed (ii) Narrow gauge

(iii) Low patronage

(iv) High cost of construction (v) Poor management (vi) Inadequate skilled technicians

(vii) High cost of maintenance (viii) Competition with other means of transportation (ix) Poor maintenance

(x) Old/outdated coaches (xi) Poor time schedules (xii) Difficult terrain (xiii) Derailment due to flooding (xiv) Poor communication

leading to accidents (xv) Scarcity of spare parts (xvi) Railways do not have wide coverage/non-flexibility (not flexible)

(xvii) Trains can only interchange at stations/single track

(xviii) Low level of agricultural and other industrial productions (xix) Lack of political will/inconsistency in government policies

(xx) Inadequate capital (xxi) Dwindling of mineral reserves (xxii) Low level of technology

Correct Answer: B. −1/2

Correct Answer: A. obstinate

Correct Answer: C. 2, 3 - dichloro - 4, 4 - dimethyl hex - 2- ene

Explanation

(a) What is Environmental Intervention? Definition Environmental intervention refers to the forces of nature and activities of man, that change the natural existence of the components of the ecosystem.

(b) Types of Environmental Intervention

(i) Natural Intervention: These include the following:

(a) Earthquake

(b) Vulcanicity

(c) Drought

(d) Flooding

(e) Hurricane

(f) Desert encroachment

(g) Tectonic movement

(h) Climatic changes

(i) Sea level changes

(ii) Human Intervention:

(1) Deforestation

(2) Bush burning

(3) Grazing

(4) Hunting

(5) Pollution

(6) Farming activities

(7) Mining / quarrying

(8) Fishing

(c) EFFECTS OF ENVIRONMENTAL INTERVENTION

(i) Natural Intervention Effects:

(a) New features different from those initially produced such as vulcanism creates volcanic mountains

(b) Changes in the landscape such as earthquake will result in digging trenches and gullies where it was not initially present, raising and lowering beaches

(c) Wide spread destruction

(d) Extinction of aquatic life e.g drought results in drying up the water and this wi!I lead to the extinction of water animals

(e) Displacement of man

(f) Displacement of animals

(g) Can lead to lighting Human Intervention

Effects:

(1) Soil erosion

(2) Deforestation

(3) Changes in energy balance

(4) Atmospheric and water pollution

(5) Land pollution leads to reduction in agricultural land

(6) Hunting causes depletion of animal reserve

(7) Destruction of the vegetation cover of the soil through bush burning

(8) Depletion of the vegetation cover of the soil through overgrazing exposes the soil to erosion.

Correct Answer: B) Canoe

Explanation

The other options listed in the question are not commonly used in the riverine area. A bus is a land-based mode of transportation that is not suitable for navigating through rivers. A train is a type of transportation that operates on tracks and is not designed for river travel. A helicopter is an aircraft that can hover in the air and is not commonly used for transportation in the riverine area.

Therefore, the correct answer to this question is Option B: Canoe.

Using a canoe as a means of transport in the riverine area allows people to navigate through the waterways and reach their destinations. Canoes are often used by fishermen, traders, and residents in riverine communities to travel across rivers, transport goods, and access different parts of the area.

It is important to understand the most common means of transport in different regions to have a better understanding of the transportation systems and infrastructure in those areas. This knowledge can be useful for planning and decision-making related to transportation and logistics in riverine areas.

Remember, the most common means of transport in the riverine area is a canoe.

Correct Answer: C) ionic and dative covalent

Correct Answer: D. words