Question:

A 500 g toothpaste sample gas 0.2 h fluoride concentration. What is the concentration of $F^-$ ions in terms of ppm level ?

Updated On: Jul 2, 2022

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The Correct Option is C

Amount in ppm = $\frac{Mass \, of \, solute \times 10^6}{Mass \, of \, solution}$ = $\frac{0.2 \times 10^{-6}}{500} $ = 400 ppm

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P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.