1. 2
2. 4
3. 1
4. 8
2
1. NaCl
2. Na2CO3
3. NaCN
4. Na2SO4
NaCN
1. C2H5, C2H5OH
2. C2H4, C2H5SH
3. C2H5OSO3H, C2H5OH
4. C2H2,CH3CHO
C<sub>2</sub>H<sub>5</sub>OSO<sub>3</sub>H, C<sub>2</sub>H<sub>5</sub>OH
1. +2
2. +4
3. +6
4. 0
+6
1. sp3
2. sp
3. sp2
4. sp3d
sp<sup>3</sup>
1. Cu and Fe
2. Cu, Sn and Zn
3. Ni, Fe and Cr
4. Al and Mg
Cu, Sn and Zn
1. K
2. Ti
3. Na
4. Sc
K
1. Cr
2. Fe
3. V
4. Ti
Cr
1. 2.5
2. 1.5
3. 2
4. 1
2
1. Sc3+
2. Ni2+
3. Ti4+
4. Zn2+
Ni<sup>2+</sup>