NEET UG CHEMISTRY MCQ: P-BLOCK ELEMENTS

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A 500 g toothpaste sample has 0.2 g fluoride concentration. What is the concentration of

{F^ - }

in ppm?

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Correct option: C

400

Option C (400) is correct because ppm (parts per million) is calculated as (mass of solute / mass of solution) * 10⁶, which in this case is (0.2 g / 500 g) * 10⁶ = 400 ppm.

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The source of most of the noble gases is: Which possesses least stable covalent P-H bond? Which gas is filled in electric bulbs/tubes? The correct order of the oxidation states of nitrogen in

NO,\,N{O_2},\,N{O_2}

and

{N_2}{O_3}

is Which of the following is not an acidic oxide? On heating with

\mathrm{NaOH}

solution and zinc,

\mathrm{NaNO}_3

liberates a gas which can also be obtained by: