Which one has highest value of ionization potential:

1. Ga
2. Borax
3. In
4. Al
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Answer: B
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The small size and high nuclear charge make boron:

1. Amphoteric
2. Metallic
3. Non-metallic
4. None of these
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Answer: C
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Which of the following set of atomic numbers belong to group III-A elements:

1. 31,13,49
2. 3,11,9
3. 7,17,31
4. 2,10,18
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Answer: A
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If a metal "M" has a volency of 3, then the formula of oxide is:

1. M₃O
2. MO₃
3. M₃O₂
4. M₂O₃
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Answer: D
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