SAAT (English)

Chemistry: sample 3

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 reactions will occur?

Cl₂ + 2HF → 2HCl + F₂
I₂ + 2HCl → 2HI + Cl₂
Br₂ + 2HCl → 2HBr + Cl₂
Cl₂ + 2HBr → 2HCl + Br₂

Show answer

Correct answer: D. Cl₂ + 2HBr → 2HCl + Br₂

Why

Reactivity of halogens decreases down the group (F>Cl>Br>I), so a more reactive halogen (Cl₂) can displace a less reactive one (Br) from its compound — Cl₂ + 2HBr → Br₂ + 2HCl occurs.

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

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