Give the reason for bleaching action of Cl2. from Chemistry The p

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The p-Block Elements

Short Answer Type

401. Sea is the greatest source of some halogens. Comment.

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402. Give the reason for bleaching action of Cl_2.

Cl₂ liberates nascent oxygen in presence of moisture or in aqueous solution
Cl₂ + H₂O→ 2HCl + O
Colourled substance + O → Colourless substance

This nascent oxygen bleaches the coloured substance present in vegteable substance due to oxidation.

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403. Name two poisonous gases which can be prepared from chlorine gas.

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404. Why is ICl more reactive than I_{2 ?}

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405. Why is helium used in dividing apparatus?

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406. Balance the following equation: Xe F₆ + H₂O→

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407. Why has it been difficult to study the chemistry of radon?

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408. Though nitrogen exhibits + 5 oxidation state it does not form pentahalide. Give reasons.

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409. PH₃ has lowerboiling point than NH₃. Why?

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410. Write the reaction of thermal decomposition of sodium azide.

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