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

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

Question 2 of 20

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

 Three

 Two

 Zero

 Four

Question 3 of 20

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

  P₄O₁₀

 P₃O₅

 P₂O₃

 P₄O₆

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

Question 5 of 20

6. What product is formed on disproportionation of H₃PO₃?

 H₄PO₄

 H₃PO₄

 H₂PO₄

 H₄PO₃

Question 6 of 20

7. The structural formula for Phosphinic acid is:

 H₃PO₄

 H₃PO₃

 H₃PO₂

 H₄P₂O₆

Question 7 of 20

8. Which oxide is represented by the following structure?

 P₂O₄

 P₄O₆

 P₄O₁₀

 P₃O₅

Question 8 of 20

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

 Zero

 Three

 Four

 One

Question 9 of 20

10. Atomicity of phosphorus is:

 2

 3

 4

 1

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

Question 11 of 20

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

 1

 3

 5

 4

Question 12 of 20

13. What is basicity of H₃PO₄?

 1

 4

 2

 3

Question 13 of 20

14. Identify the element whose compounds show phosphorescence.

  Sulphur

 Phosphorus

 Nitrogen

 Oxygen

Question 14 of 20

15. Which isotope of phosphorus is kept under water?

  Yellow

 Black

 White

 Red

Question 15 of 20

16. How many forms Black phosphorus has?

 3

 1

 4

 2

Question 16 of 20

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

  +3

 +2

 +5

 +4

Question 17 of 20

18. What is the anhydride of H₃PO₃?

  P₃O₅

 P₂O₄

 P₄O₁₀

  P₄O₆

Question 18 of 20

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

  60

 120

 90

 45

Question 19 of 20

20. Which one of the following is dibasic acid?

  H₃PO₄

 H₃PO₂

 H₄P₂O₇

 H₃PO₃

Question 20 of 20

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