Which of the following pairs of ions are colourless?
- A$Ti^{3+}, Cu^{2+}$
- B$Sc^{3+}, Zn^{2+}$
- C$Co^{2+}, Fe^{3+}$
- D$Ni^{2+}, V^{3+}$
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Match the following components of a cell with their respective percentage of the total cellular mass:
Components $\%$ of the total cellular mass $A$. Water $1$. $10-15$ $B$. Proteins $2$. $70-90$ $C$. Carbohydrates $3$. $5-7$ $D$. Lipids $4$. $3$ $E$. Nucleic acids $5$. $2$ $F$. Ions $6$. $1$
| Components | $\%$ of the total cellular mass |
| $A$. Water | $1$. $10-15$ |
| $B$. Proteins | $2$. $70-90$ |
| $C$. Carbohydrates | $3$. $5-7$ |
| $D$. Lipids | $4$. $3$ |
| $E$. Nucleic acids | $5$. $2$ |
| $F$. Ions | $6$. $1$ |
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