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The p-Block Elements

Multiple Choice Questions

291.

The most abundant noble gas in atmosphere is

neon
argon
xenon
krypton

292.

The least stable hydride of 15th group elements is

BiH₃
NH₃
AsH₃
SbH₃

293.

Which one of the following oxides of nitrogen dimerises into colourless is solid/ liquid on cooling?

N₂O
NO
N₂O₃
NO₂

294.

Halogens exist in -1,+ 1, + 3, + 5 and 47 oxidation states. The halogen that exists only in -1 state is

295.

Among the oxyacids of phosphorus, the dibasic acid is

H₃PO₃
H₄P₂O₇
H₂PO₂
HPO₃

296.

Which of the following is the correct method of preparation of methyl fluoride?

CH₄ + HF →
CH₃OH + HF →
CH₄ + F₂ →
CH₃Br + AgF →

297.
Which of the following species can function both as oxidising as well as reducing agent?

Cl^-

${ClO}_{4}^{-}$

ClO^-

${MnO}_{4}^{-}$

ClO^-

In all the given species except ClO^-, the central atoms are either in their minimum or maximum oxidation states and hence, they cannot further decrease or increase their oxidation states. In ClO^-, the oxidation state of Cl can be increased or decreased when it acts as oxidising or reducing agents.

Species Oxidation state

Cl^- -1

${ClO}_{4}^{-}$ +7

ClO^- +1

${MnO}_{4}^{-}$ +7

${NO}_{3}^{-}$ +5