Elements of Group 13, 14 and 15

1. A.
   $-2$ and $+6$
2. B.
   $-1$ and $+3$
3. C.
   $+2$ and $+2$
4. D.
   $-2$ and $+3$

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1. A.
   $-5$
2. B.
   $+3$
3. C.
   $+5$
4. D.
   $+6$

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1. A.
   $\mathrm{As}$
2. B.
   $\mathrm{N}$
3. C.
   $\mathrm{O}$
4. D.
   $\mathrm{P}$

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1. A.
   $\mathrm{Sn_2O_3}$
2. B.
   $\mathrm{SnO_2}$
3. C.
   $\mathrm{SnO_4}$
4. D.
   SnO

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1. A.
   Cristobalite
2. B.
   $\alpha$ - quartz
3. C.
   $\beta$ - quartz
4. D.
   Aragonite

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1. A.
   Acidic
2. B.
   Basic
3. C.
   Amphoteric
4. D.
   Neutral

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1. A.
   $Mg,P$ and S
2. B.
   $\ Ca,P$ and O
3. C.
   $Al,Mg$ and P
4. D.
   $\ Ca,S$ and O

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