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PIMSO 2025 - Science - Primary 1 - National Round Question 7

PIMSO Science · PIMSO 2025 - Science - Primary 1 - National Round

Question 7

Power of Hydrogen or pH is a measurement of the alkalinity or acidity of a solution. The measurement uses a scale from 0 to 14 where less than 7 is acidic, 7 is neutral, and greater than 7 is alkaline. Anthony gave the table below to his friends. The table shows the solution and their corresponding pH level. Anthony told his friends that solution Z is less acidic than solution X but more acidic than solution Y. What is the possible pH for solution Z?

Question illustration

Table: V: 8.3; X: 5.6; Y: 7.0; Z: unknown.
  1. greater than 7.0 but less than 8.3
  2. between 5.6 and 7.0
  3. between 7.0 and 8.3
  4. less than 5.6