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Amorphous boron on burning in air forms:

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Important Questions on The p-block Elements

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Which compound is called sugar of lead?
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The formula of white lead is
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Which of the following halides is the least stable and has doubtful existence?
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Which of the following pair of elements has a maximum difference of radii?
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Which of the following order regarding thermal stability of hydrides of group 15 is correct?
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The reaction of P4 with X leads selectively to formation of P4O6,  X is:
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The common minerals of phosphorus are:
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Which of the following oxides is an alkaline?