Neco 2021 Geography Question 19

Practice objective / multiple choice question 19 from the 2021 Neco Geography examination.

Neco 2021 Geography Objective / Multiple Choice Medium Difficulty
Question 19 NECO • 2021 • GEOGRAPHY • objective

A rock sample weighs 250 g. Chemical analysis shows it contains 45\% quartz, 30\% feldspar, 15\% mica and the remainder other minerals. (a) Determine the mass of each mineral present. (b) A rock is classified as granite when quartz \ge 20\%, feldspar \ge 25\% and mica \le 10\%. Does this sample qualify as granite? Justify your answer.

Answer Options

A. Quartz: 112.5 g; Feldspar: 75 g; Mica: 37.5 g; Others: 25 g. The rock is granite because all criteria are met.
B. Quartz: 100 g; Feldspar: 80 g; Mica: 30 g; Others: 40 g. The rock is NOT granite because quartz is below 20\\%.
C. Quartz: 112.5 g; Feldspar: 70 g; Mica: 37.5 g; Others: 30 g. The rock is NOT granite because feldspar is below 25\\%.
Correct Answer D. Quartz: 112.5 g; Feldspar: 75 g; Mica: 37.5 g; Others: 25 g. The rock is NOT granite because mica exceeds 10\%.
Correct Answer
D
Correct Option:
Quartz: 112.5 g; Feldspar: 75 g; Mica: 37.5 g; Others: 25 g. The rock is NOT granite because mica exceeds 10\%.

About This Question

This is Neco 2021 Geography Question 19. It is one of the objective questions from the 2021 Neco Geography examination.

Difficulty level: Medium .

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