An industrial chemist evaluates four chemical substances (W, X, Y, and Z) based on their p… — JAMB UTME

An industrial chemist evaluates four chemical substances ( $W$ , $X$ , $Y$ , and $Z$ ) based on their production scale, manufacturing process, purity standards, and economic value:

- **Substance $W$ **: Synthesized via continuous plant operation in high tonnage for fertilizer manufacturing; requires industrial-grade purity.
- **Substance $X$ **: Formulated in small-batch reactors under stringent quality controls for pharmaceutical use; commands a high price per gram.
- **Substance $Y$ **: Manufactured continuously in bulk quantities as a primary alkaline agent for soap making.
- **Substance $Z$ **: Produced in multi-step batch synthesis to yield high-purity analytical indicators.

Which of the following options correctly groups these substances into heavy chemicals and fine chemicals?

Heavy chemicals: $W$ and $Y$ ; Fine chemicals: $X$ and $Z$ Answer
B
Heavy chemicals: $X$ and $Z$ ; Fine chemicals: $W$ and $Y$
C
Heavy chemicals: $W$ and $X$ ; Fine chemicals: $Y$ and $Z$
D
Heavy chemicals: $Y$ and $Z$ ; Fine chemicals: $W$ and $X$

Answer

Heavy chemicals:

W

and

Y

; Fine chemicals:

X

and

Z

Heavy chemicals are manufactured continuously in vast quantities (bulk scale) for use as primary industrial feedstocks (such as fertilizers and soap reagents), which describes substances

W

and

Y

. Fine chemicals are produced in small batch operations with strict purity standards for specialized high-value uses (such as pharmaceuticals and analytical reagents), which describes substances

X

and

Z

Step-by-Step Solution

Analyze the operational parameters of Heavy Chemicals

Heavy chemicals are characterized by continuous production processes, massive tonnage/bulk scale, relatively lower unit cost, and application as basic raw materials (e.g., fertilizers, saponification agents).

Substances

W

(fertilizer raw material via continuous high tonnage) and

Y

(bulk alkaline agent for soap making via continuous synthesis) fit all criteria for heavy chemicals.

Analyze the operational parameters of Fine Chemicals

Fine chemicals are characterized by batch manufacturing processes, high purity standards, multi-stage synthesis, specialized applications, and high unit cost.

Substances

X

(pharmaceutical formulation via small-batch reactors with high price per gram) and

Z

(analytical indicators via multi-step high-purity batch synthesis) fit all criteria for fine chemicals.

Match the identified categories to the options

Substances

W

and

Y

are heavy chemicals, while substances

X

and

Z

are fine chemicals.

This corresponds to the correct classification option.

Key Concept

Distinction between Heavy Chemicals (bulk scale, continuous process, raw material applications) and Fine Chemicals (small batch, high purity, high unit value).

Question

Answer

Step-by-Step Solution

Key Concept

Common Mistakes

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