METALLOIDS: Elements which show some properties of metals and some other properties of nonmetals are called metalloids. Metalloids look like metals but they are brittle like non metals. Metalloids are typically semi-conductors which means that they both insulate and conduct electricity. The semiconductor property makes metalloid very useful as a computer chip material. They are also called as semi metals.
Some important examples of metalloids are as follows: Boron$(B)$, Silicon$(Si)$ and Germanium$(Ge)$.
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The teacher instructed three students $‘A’, ‘B’$ and $‘C’$ respectively to prepare a $50 \%$ (mass by volume) solution of sodium hydroxide $(NaOH)$. $‘A’$ dissolved $50g$ of $NaOH$ in $100\ mL$ of water, $‘B’$ dissolved $50\ g$ of $NaOH$ in $100\ g$ of water while $‘C’$ dissolved $50\ g$ of $NaOH$ in water to make $100\ mL$ of solution. Which one of them has made the desired solution and why?
You are given two samples of water labelled as $‘A’$ and $‘B’$. Sample $‘A’$ boils at $100^\circ\ C$ and sample $‘B’$ boilsa $102^\circ\ C$. Which sample of water will not freeze at $0^\circ C$? Comment.