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Test: Phosphorus Halides & Oxoacids of Phosphorus - NEET MCQ


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10 Questions MCQ Test - Test: Phosphorus Halides & Oxoacids of Phosphorus

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Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 1

A translucent white waxy solid (A) reacts with excess of chlorine to give a yellowish white powder (B). (B) reacts with organic compounds containing -OH group converting them into chloro derivatives. (B) on hydrolysis gives (C) and is finally converted to phosphoric acid. (A), (B) and (C) are?

Detailed Solution for Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 1

A translucent white waxy solid (A) reacts with excess of chlorine to give a yellowish white powder (B). Here B is PCl5​.PCl5​ reacts with organic compounds containing -OH group converting them into chloro derivative POCl3​..PCl5​ on hydrolysis gives (C).C is POCl3​ and is finally POCl3​ converted to phosphoric acid.

So  (A), (B) and (C) are P4​,PCl5​,POCl​3.

Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 2

Which of the following is not correctly matched?

Detailed Solution for Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 2

Colour of PCl5​ is not brownish but a greenish yellow crystalline solid with an irritating odour.

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Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 3

On reaction with Cl2​, phosphorus forms two types of halides 'A' and 'B'. Halide 'A' is yellowish-white powder but halide 'B' is colourless oily liquid. What would be the hydrolysis products of 'A' and 'B' respectively?

Detailed Solution for Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 3

Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 4

Which of the following statements is not correct about the structure of PCl5​?

Detailed Solution for Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 4

The axial bond pairs suffer more repulsion as compared to equatorial bond pairs.

Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 5

Why are all P-F bonds in PF5 are not equivalent?

Detailed Solution for Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 5

Structure of PF5

PF5 has three axial bonds and two equitorial bonds and has sp3d hybridisation PCl5 has trigonal bipyramidal structure .

Due to this two Cl atoms lie along axial line and other three Cl atoms lie along the equatorial plane.

Hence Cl atoms which lie along axis have different bond length than that of Cl atoms lying on equatorial plane.

Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 6

Match the column I with column II and mark the appropriate choice.

Detailed Solution for Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 6

(A) Laughing Gas ⟶ Nitrous oxide.

As this gas sometimes generates a feeling of euphoria due to which a person wants to laugh after smelling it.

(B) Anhydride of HNO3​ ⟶ anhydride means a compound obtained after water has been removed from other compounds.

From HNO3​,H2​O can't be removed  so, if we take 2(HNO3​)

(C) Anhydride of HPO3

Similarly as above if we take

(D) Acid Anhydride of nitrogen.

Acid Anhydride is formed by the combination of two acid structures with an ion of a water molecule.

Hydrazine reacts with nitrous acid giving acid anhydride of nitrogen, i.e, hydrazoic acid with loss of 2 molecules of water.

N2​H4​ + HNO2​ ⟶ HN3​ + 2H2​O

Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 7

How many P - O - P bonds appear in cyclic metaphosphoric acid?

Detailed Solution for Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 7

The number of P-O-P bond in cyclic metaphosphoric acid is three.

Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 8

 Which of the following is a tetrabasic acid?

Detailed Solution for Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 8

Pyrophosphoric acid (H4P2O7) is tetrabasic acid.

Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 9

Match the column I and column II and mark the appropriate choice. 

Detailed Solution for Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 9

H3​PO2​ ⟶ 3 + x − 4 = 0

x = +1

H3​P3​O9​ ⟶  3 + 3x − 18 = 0

⇒ 3x = 15

⇒ x = +5

H3​PO4​ ⟶ 3  + x − 8 = 0

⇒ x = +5

H3​PO3​ ⟶ 3 + x − 6 = 0

⇒ x = +3

(A) H3​PO2​ ⟶ monobasic acid having 1 removable H+ ion.

(B) H3​P3​O9​ ⟶ cyclic oxoacid

(Refer to Image)

(C) H3​PO4​⟶ Tribasic ⟶ having 3 removable H+ ion.

Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 10

Phosphorous acid on heating gives the following products:

The above reaction is an example of

Detailed Solution for Test: Phosphorus Halides & Oxoacids of Phosphorus - Question 10


It is disproportional where Phosphorus changes from +3 to −3 and +5. So, this is an example of disproportion reaction.

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