In borax bead test which compound is formed_________?
Correct answer: B. Meta borate
- A. Ortho burate
- B. Meta borate
- C. Double oxide
- D. Tetra borate
Explanation
On heating, borax forms sodium metaborate, NaBO2, and boric anhydride, B2O3; in the bead test, the oxide then combines with a metal oxide to form a coloured metal metaborate or borate. Thus the expected compound type is metaborate. The likely wrong choice is tetraborate, which is the borate group in the original borax formula, not the principal product formed on heating.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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