Testing and Identifying Substances

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1. CSCA Chemistry December 2025 Past Paper
   In the flame test with sodium chloride, the flame color is ( )
   • A. Pale white
   • B. Yellow
   • C. Light blue
   • D. Green
   Lihat jawaban & pembahasan

   Jawaban: B

   Answer: B Na⁺ gives a bright yellow flame in the flame test (a standard fact to memorize).
   Lihat di CSCA Chemistry December 2025 Past Paper lengkap
2. CSCA Chemistry April 2026 Past Paper
   Which of the following salts produces a violet flame in a flame test? ( )
   • A. $\mathrm{CaCl_{2}}$
   • B. KCl
   • C. $\mathrm{Na_{2}SO_{4}}$
   • D. $\mathrm{CuCl_{2}}$
   Lihat jawaban & pembahasan

   Jawaban: B

   Answer: B Potassium produces a violet flame in a flame test (viewed through blue cobalt glass).
   Kerjakan CSCA Chemistry April 2026 Past Paper lengkap — berwaktu & dinilai
3. CSCA Chemistry March 2026 Past Paper
   A substance produces a yellow flame in a flame test. It must contain
   • A．Sodium
   • B．Potassium
   • C．Calcium
   • D．Copper
   Lihat jawaban & pembahasan

   Jawaban: A

   Yellow flame $=$ sodium. Answer: $A$.
   Kerjakan CSCA Chemistry March 2026 Past Paper lengkap — berwaktu & dinilai