Phosphorus and Its Compounds, Class 12 Chemistry NCERT Solutions

1. There will be total 20  MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying.

1. Which allotropic form of Phosphorus glows in dark?

White phosphorus

Black phosphorus

Grey phosphorus

Red phosphorus

Your comments:

Question 1 of 20

2. The shape and hybridization of PCl₃ molecule is:

Planar and sp²

Tetrahedral and sp³

Pyramidal and sp³

Square planar and dsp²

Your comments:

Question 2 of 20

3. The number of P-O-P bonds in cyclic metaphosphoric acid is:

Three

Two

Zero

Four

Your comments:

Question 3 of 20

4. Which oxide of phosphorus is used extensively as a drying agent?

P₄O₁₀

P₃O₅

P₂O₃

P₄O₆

Your comments:

Question 4 of 20

5. Which of the following describes the bonds in PCl₅ ?

4 axial and 1 equatorial

1 axial and 4 equatorial

2 axial and 3 equatorial

3 axial and 2 equatorial

Your comments:

Question 5 of 20

6. What product is formed on disproportionation of H₃PO₃?

H₄PO₄

H₃PO₄

H₂PO₄

H₄PO₃

Your comments:

Question 6 of 20

7. The structural formula for Phosphinic acid is:

H₃PO₄

H₃PO₃

H₃PO₂

H₄P₂O₆

Your comments:

Question 7 of 20

8. Which oxide is represented by the following structure?

P₂O₄

P₄O₆

P₄O₁₀

P₃O₅

Your comments:

Question 8 of 20

9. The number of P-O-P bonds in Pyrophosphoric acid is:

Zero

Three

Four

One

Your comments:

Question 9 of 20

10. Atomicity of phosphorus is:

2

3

4

1

Your comments:

Question 10 of 20

11. One mole of calcium phosphide on reaction with excess of water gives:

One mole of phosphine

One mole of phosphorous acid

Two moles of phosphine

Two moles of phosphoric acid

Your comments:

Question 11 of 20

12. What is the oxidation number of the phosphorus in Pyrophosphoric acid?

1

3

5

4

Your comments:

Question 12 of 20

13. What is basicity of H₃PO₄?

1

4

2

3

Your comments:

Question 13 of 20

14. Identify the element whose compounds show phosphorescence.

Sulphur

Phosphorus

Nitrogen

Oxygen

Your comments:

Question 14 of 20

15. Which isotope of phosphorus is kept under water?

Yellow

Black

White

Red

Your comments:

Question 15 of 20

16. How many forms Black phosphorus has?

3

1

4

2

Your comments:

Question 16 of 20

17. What is the oxidation number of the phosphorus in PF₃?

+3

+2

+5

+4

Your comments:

Question 17 of 20

18. What is the anhydride of H₃PO₃?

P₃O₅

P₂O₄

P₄O₁₀

P₄O₆

Your comments:

Question 18 of 20

19. What is the P-P-P bond angle in P₄ molecule in degrees?

60

120

90

45

Your comments:

Question 19 of 20

20. Which one of the following is dibasic acid?

H₃PO₄

H₃PO₂

H₄P₂O₇

H₃PO₃

Your comments:

Question 20 of 20

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