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1. A
   Beryllium
2. B
   Liquid sodium
3. C
   Caesium
4. D
   Calcium

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1. A
   $1.70$ cm$^{-1}$
2. B
   $0.017$ cm$^{-1}$
3. C
   $0.058$ cm$^{-1}$
4. D
   $0.012$ cm$^{-1}$

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1. A
   $sp^3d^2$
2. B
   $sp^3$
3. C
   $sp^2$
4. D
   $sp$

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1. A
   Monochloromethane
2. B
   Dichloromethane
3. C
   Trichloromethane
4. D
   Tetrachloromethane

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1. A
   $2 \times 10^{-2}$
2. B
   $4 \times 10^{-4}$
3. C
   $5 \times 10^{-5}$
4. D
   $2.5 \times 10^{-4}$

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1. A
   (image A)
2. B
   (image B)
3. C
   (image C)
4. D
   (image D)

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1. A
   $4.07 \times 10^{-8}$ cm
2. B
   $3.22 \times 10^{-8}$ cm
3. C
   $2.63 \times 10^{-8}$ cm
4. D
   $2.23 \times 10^{-8}$ cm

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1. A
   Nylon 6
2. B
   Dacron
3. C
   Bakelite
4. D
   Polyacrylamide

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1. A
   Legumelin
2. B
   Myosin
3. C
   Insulin
4. D
   Serum albumin

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1. A
   $NH_3 + C_6H_6$
2. B
   $NaCl + H_2O$
3. C
   $CH_4 + C_2H_6$
4. D
   $HF + H_2O$

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1. A
   $125$ ohm$^{-1}$ cm$^{-2}$ mol$^{-1}$
2. B
   $0.05$ ohm$^{-1}$ cm$^{-2}$ mol$^{-1}$
3. C
   $725$ ohm$^{-1}$ cm$^{-2}$ mol$^{-1}$
4. D
   $800$ ohm$^{-1}$ cm$^{-2}$ mol$^{-1}$

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1. A
   $NO, NO_2$
2. B
   $CO, CO_2$
3. C
   $H_2O, H_2O_2$
4. D
   $Na_2S, NaF$

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1. A
   Oxygen
2. B
   Nitrogen
3. C
   Sulphur
4. D
   Selenium

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1. A
   4
2. B
   3
3. C
   2
4. D
   1

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1. A
   Conc. $HCl + ZnCl_2$
2. B
   Neutral $FeCl_3$ solution in water
3. C
   $NaNO_2 + HCl$ (dil.)
4. D
   $CHCl_3 + NaOH$

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1. A
   $Na_2SO_4$
2. B
   $CH_3COONa$
3. C
   $NH_4NO_3$
4. D
   $CuCl_2$

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1. A
   $CO_2$, 6 atm $H_3O^+$
2. B
   $CHCl_3$, aq. $NaOH$, $H_3O^+$
3. C
   $CS_2$ (at low temperature)
4. D
   $Na_2Cr_2O_7/H_2SO_4$

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1. A
   $1.2044 \times 10^{23}$
2. B
   $2.387 \times 10^{23}$
3. C
   $3.011 \times 10^{23}$
4. D
   $3.321 \times 10^{23}$

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1. A
   30%
2. B
   35%
3. C
   50%
4. D
   75%

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1. A
   $\frac{2}{9}\log(x-1)+\frac{1}{3}\times\frac{1}{x-1}+\frac{2}{9}\log(x+2)+c$
2. B
   $\frac{2}{9}\log(x-1)-\frac{1}{3}\times\frac{1}{(x-1)}+\frac{2}{9}\log(x+2)+c$
3. C
   $\frac{2}{9}\log(x-1)+\frac{1}{3}\times\frac{1}{x-1}-\frac{2}{9}\log(x+2)+c$
4. D
   $\frac{2}{9}\log(x-1)-\frac{1}{3}\times\frac{1}{x-1}-\frac{2}{9}\log(x+2)+c$

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1. A
   $\frac{4}{5}$
2. B
   $\frac{4}{14}$
3. C
   $\frac{5}{3}$
4. D
   $\frac{5}{4}$

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1. A
   60
2. B
   420
3. C
   360
4. D
   120

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1. A
   $x-y \leq 0,\,-x+3y \leq 3,\,x \geq 0,\,y \geq 0$
2. B
   $x-y \geq 0,\,-x+3y \geq 3,\,x \geq 0,\,y \geq 0$
3. C
   $x-y \geq 0,\,-x+3y \leq 3,\,x \geq 0,\,y \geq 0$
4. D
   $x-y \leq 0,\,-x+3y = 3,\,x \geq 0,\,y \geq 0$

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1. A
   $-\frac{16}{3}$
2. B
   $\frac{8}{3}$
3. C
   $-\frac{8}{3}$
4. D
   $\frac{16}{3}$

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1. A
   $\frac{14}{45},\frac{40}{27}$
2. B
   $\frac{14}{15},-\frac{40}{9}$
3. C
   $\frac{14}{15},\frac{40}{9}$
4. D
   $\frac{14}{45},-\frac{40}{27}$

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