EASY

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Which allotrope of phosphorus is least reactive?

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Important Questions on The p-Block Elements

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

How does white phosphorus react with (i)

H_{2} {SO}_{4}

, (ii) sulphur, (iii)

Mg

, (iv)

Na

and (v)

{HNO}_{3}

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

Which of the following is kept under water ?

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

Heating white phosphorus with conc.

NaOH

solution gives mainly

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

Name the allotrope of phosphorous that exhibits chemiluminescence.

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

The product formed by the reaction of

{SOCl}_{2}

with white phosphorus is

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

Write main differences between the properties of white phosphorus and red phosphorus.

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

The most reactive allotropic form of phosphorus is

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

What happens when yellow phosphorus is heated with dilute

NaOH

solution?

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at

803 K ?

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

The element that does NOT exhibits allotropy is-

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

Concentrated

{HNO}_{3}

oxidise white phosphorus into which substance?

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

The

P - P - P

bond angle in white phosphorus is

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

White phosphorous

P_{4}

has the following characteristics

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

Explain with chemical equation - What happen when white phosphorous is heated at

473 K

and very high pressure?

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

Complete and balance the following chemical equations:

P_{4} + NaOH + H_{2} O \to_{Inert atm .}^{heat}

_____+_____.

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

White phosphorus possesses _____ composition in vapour state.

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

Which among the group -15 elements does NOT exist as tetra atomic molecule?

EASY

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

White phosphorus, when heated with conc.

NaOH

solution in an inert atmosphere of

{CO}_{2}

, forms phosphine and a sodium salt of oxoacid of phosphorus,

' X'

. The oxidation state of phosphorus in

' X'

HARD

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

White phosphorus on reaction with concentrated

N a O H

solution in an inert atmosphere of

C O_{2}

gives phosphine and compound

(X) . (X)

on acidification with

H C l

gives compound

(Y) .

The basicity of compound

(Y)

is:

MEDIUM

Chemistry>Inorganic Chemistry>The p-Block Elements>Allotropes of Phosphorus

The element that catches fire in air at

30 ° C

and is stored under water is

Which allotrope of phosphorus is least reactive?

Important Questions on The p-Block Elements

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