MCQ
Which of the following terms are unitless?
- AMolality.
- BMolarity.
- CMole fraction.
- DMass percent.
Explanation:
Mole fraction,
$\text{x}_\text{A}=\frac{\text{n}_\text{A}}{\text{n}_\text{A}+\text{n}_\text{B}}=\frac{\text{Mole of component}}{\text{Total number of moles}}\text{(unitless)}$
Mass percentage $\frac{\text{Mass of component}}{\text{Total mass}}\times100\text{(unitless)}$
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| List -$I$ Molecule | List - $II$ Shape |
| $(A)$. $\mathrm{BrF}_5$ | $(I)$. $T$-shape |
| $(B)$. $\mathrm{H}_2 \mathrm{O}$ | $(II)$. See saw |
| $(C)$. $\mathrm{ClF}_3$ | $(III)$. Bent |
| $(D)$. $\mathrm{SF}_4$ | $(IV)$. Square pyramidal |