NEET UG CHEMISTRY MCQ: P-BLOCK ELEMENTS

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Mixture used in Holme’s signals is

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Correct option: C

Ca{C_2} + C{a_3}{P_2}

Option C (

Ca{C_2} + C{a_3}{P_2}

) is correct because the mixture of calcium carbide and calcium phosphide produces acetylene and phosphine, which ignite spontaneously and produce a bright light, used as a signal.

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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: