Build a question paper in 60 seconds.

1. A
   $SF_6$
2. B
   $PCl_5$
3. C
   $LiCl$
4. D
   $H_2SO_4$

Tap an option to check your answer.

1. A
   $1\times10^{21}$
2. B
   $1.5\times10^{21}$
3. C
   $3.0\times10^{21}$
4. D
   $6.0\times10^{21}$

Tap an option to check your answer.

1. A
   Benzene
2. B
   Chlorobenzene
3. C
   Toluene
4. D
   Phenol

Tap an option to check your answer.

1. A
   $\frac{l}{a} = \frac{k}{R}$
2. B
   $\frac{l}{a} = k \cdot R$
3. C
   $\frac{l}{a} = \frac{R}{k}$
4. D
   $\frac{l}{a} = \frac{1}{R}$

Tap an option to check your answer.

1. A
   Platinised asbestos
2. B
   $MnO_2$
3. C
   Co-Th alloy
4. D
   Fe-Cr

Tap an option to check your answer.

1. A
   3.5 J
2. B
   4.5 J
3. C
   9.0 J
4. D
   15 J

Tap an option to check your answer.

1. A
   $\frac{2\pi}{7}$
2. B
   $\frac{\pi}{7}$
3. C
   $\frac{\pi}{2\sqrt{7}}$
4. D
   $\frac{\pi}{\sqrt{7}}$

Tap an option to check your answer.

1. A
   $4\log 2$
2. B
   $-3\log 2$
3. C
   $-4\log 2$
4. D
   $3\log 2$

Tap an option to check your answer.

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

Tap an option to check your answer.

1. A
   0.6
2. B
   0.06
3. C
   0.006
4. D
   1.07

Tap an option to check your answer.

1. A
   0
2. B
   1
3. C
   a
4. D
   2

Tap an option to check your answer.

1. A
   0
2. B
   1
3. C
   4
4. D
   2

Tap an option to check your answer.

1. A
   $(-1)^k(k-1)\pi$
2. B
   $(-1)^{k-1}(k-1)\pi$
3. C
   $(-1)^k k\pi$
4. D
   $(-1)^{k-1}k\pi$

Tap an option to check your answer.

1. A
   $-\frac{\pi}{6}+\frac{1}{2}+\frac{\sqrt{3}}{4}$
2. B
   $-\frac{\pi}{12}+\frac{1}{2}+\frac{\sqrt{3}}{4}$
3. C
   $\frac{\pi}{6}+\frac{1}{2}-\frac{\sqrt{3}}{4}$
4. D
   $\frac{\pi}{12}+\frac{1}{2}-\frac{\sqrt{3}}{4}$

Tap an option to check your answer.

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

Tap an option to check your answer.

1. A
   $\frac{1}{2}$
2. B
   $\frac{1}{5}$
3. C
   $\frac{1}{10}$
4. D
   $\frac{1}{20}$

Tap an option to check your answer.

1. A
   $\frac{2}{\sqrt{6}}$ or $\frac{6}{\sqrt{14}}$
2. B
   $\frac{1}{\sqrt{6}}$ or $\frac{5}{\sqrt{14}}$
3. C
   $\frac{2}{\sqrt{6}}$ or $\frac{5}{\sqrt{14}}$
4. D
   $\frac{1}{\sqrt{6}}$ or $\frac{6}{\sqrt{14}}$

Tap an option to check your answer.

1. A
   $a\alpha^2 - b\alpha - a = 0$
2. B
   $a\alpha^2 - b\alpha - a = 1$
3. C
   $a\alpha^2 + b\alpha - a = -2\alpha^2$
4. D
   $a\alpha^2 + b\alpha + a = 0$

Tap an option to check your answer.

1. A
   4
2. B
   7
3. C
   8
4. D
   6

Tap an option to check your answer.

1. A
   8
2. B
   $\frac{19}{3}$
3. C
   7
4. D
   19

Tap an option to check your answer.

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

Tap an option to check your answer.

1. A
   $(1,-1,1)$
2. B
   $(-1,-1,1)$
3. C
   $(1,1,1)$
4. D
   $(-1,-1,-1)$

Tap an option to check your answer.

1. A
   $\cos\beta > 0$
2. B
   $\sin\beta < 0$
3. C
   $\cos(\alpha+\beta) > 0$
4. D
   $\cos\alpha < 0$

Tap an option to check your answer.

1. A
   4
2. B
   9
3. C
   2
4. D
   15

Tap an option to check your answer.

1. A
   $\sqrt{2}-1$
2. B
   $1-\sqrt{2}$
3. C
   $\sqrt{2}$
4. D
   $\sqrt{2}+1$

Tap an option to check your answer.