Which of the following does not give Borax bead test ?
Correct answer: D. A1
- A. Cu
- B. Cr
- C. Ni
- D. A1
Explanation
Copper, chromium and nickel form coloured metal metaborates in the oxidising or reducing parts of a borax bead, giving characteristic bead colours. Aluminium generally does not give a characteristic borax bead test, so students who choose copper are confusing a strongly coloured test result with a negative one.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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