Aqueous solution of borax above 62°C gives crystals of________________?
Correct answer: B. Na2B4O7.5H2O
- A. Na2B4O7.4H2O
- B. Na2B4O7.5H2O
- C. Na2B4O7.2H2O
- D. Na2B4O7.10H2O
Explanation
Borax normally crystallizes as Na2B4O7.10H2O, but above about 62°C the decahydrate loses water and forms the pentahydrate, Na2B4O7.5H2O. The likely wrong choice is d, because students remember the common decahydrate formula without considering the effect of temperature.
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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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