SAAT (English)

Chemistry: sample 4

These questions are ETEC/Qiyas's own officially published trial-exam questions, shown here with attribution. They are not sold and are not part of Smart Advanced Network for Education, Development & Achievement's original question bank.

Directions

Read the following questions. Choose the right answer.

There is only ONE correct answer to each question.

Which of the following gases turns limewater milky when bubbled through it?

CO₂
H₂
O₂
O₃

Show answer

Correct answer: A. CO₂

Why

Carbon dioxide (CO₂) reacts with calcium hydroxide in limewater to form insoluble calcium carbonate, turning it milky.

Source: The Standardized Academic Achievement Test (SAAT) for the Science Track Trial Test (ETEC official) Open the official document

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