MCQ
Which statement is not true concerning alkanes
- ✓Large number alkanes are soluble in water
- BAll alkanes have a lower density than water
- CAt room temperature some alkanes are liquids, some solids and some gases
- DAll alkanes burn
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$BaCl_2 + Na_2SO_4 \to BaSO_4 + 2NaCl$

Statement $I$ : Gallium is used in the manufacturing of thermometers.
Statement $II$ : A thermometer containing gallium is useful for measuring the freezing point ( $256 \mathrm{~K}$ ) of brine solution.
In the light of the above statement, choose the correct answer from the options given below :