iGCSE Chemistry Multiple Choice (Extended) : 10.1 Water: Exam Style Questions Paper 2

Question

What is the equation for photosynthesis?

A) \(6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2\)
B) \(2CO_2 + 2H_2O \rightarrow 2C_2H_5OH + 3O_2\)
C) \(C_6H_{12}O_6 \rightarrow 2CO_2 + 2C_2H_5OH\)
D) \(C_2H_5OH + 3O_2 \rightarrow 2CO_2 + 3H_2O\)

▶️ Answer/Explanation

Solution

Ans: A

Photosynthesis is the process where plants convert carbon dioxide and water into glucose and oxygen using sunlight energy. Option A correctly shows this balanced equation. Option B shows fermentation, option C shows anaerobic respiration, and option D shows combustion of ethanol.

Question

The diagram shows the uses and treatment processes of muddy river water.

Which row identifies uses 1 and 2 and processes 1 and 2?

Answer/Explanation

Ans:

Question

Water can be treated by filtration then chlorination. Which uses do not need water of this quality?
1 water for cooling in industry
2 water for washing clothes
3 water for drinking
A. 1, 2 and 3 B. 1 and 2 only C. 1 and 3 only D. 2 and 3 only

Answer/Explanation

Ans:

Question

Water is treated at a waterworks to make it fit to drink.
What is present in the water when it leaves the waterworks?
A bacteria only
B bacteria and insoluble substances
C chlorine compounds only
D chlorine compounds and soluble substances

Answer/Explanation

Ans: D

iGCSE Chemistry Multiple Choice (Extended) : 10.1 Water: Exam Style Questions Paper 2

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