Which of the following methods of expressing concentration are unitless?
Mole fraction and Mass percent (W/W)
Molality and Mole fraction
Mass percent (W/W) and Molality
Molality and Molarity
Select the INCORRECT statement/s from the following:
(a) 22 books have infinite significant figures
(b) In the answer of calculation $2.5 \times 1.25$ has four significant figures,.
(c) Zero's preceding to first non-zero digit are significant
(d) In the answer of calculation $12.11+18.0+1.012$ has three significant figures
$$ \text { Given below and the atomic masses of the elements: } $$
$$ \begin{array}{|l|l|l|l|l|l|l|l|l|l|} \hline \text { Element: } & \mathrm{Li} & \mathrm{Na} & \mathrm{Cl} & \mathrm{~K} & \mathrm{Ca} & \mathrm{Br} & \mathrm{Sr} & \mathrm{I} & \mathrm{Ba} \\ \hline \text { Atomic Mass }\left(\mathrm{g} \mathrm{~mol}^{-1}\right): & 7 & 23 & 35.5 & 39 & 40 & 80 & 88 & 127 & 137 \\ \hline \end{array} $$
$$ \text { Which of the following doesn't form triad? } $$