Question

(D) One word Answers
11. Name the protozoa that cause black fever.
12. What is the valency of phosphate ion?
13. Write the electron distribution in a silicon atom.
14. Name the disease that is caused by bacteria.​

Answer 1

Answer:

11. Kala azar

12. 3

13. 1s22s22p63s23p2

14. Cholera

Answer 2

              Answers

11. The protozoa that causes black fever also called Kala-Azar is Leishmania.

12. We know that phosphate ion is PO₄

Valency of one oxygen atom = 2.

Valency of four oxygen atoms = 2 × 4 = 8.

Valency of phosphor atom = 5.

Valency of phosphate ion = Valency of  phosphor atom - Valency of four oxygen atoms

⇒ Valency of phosphate ion = 5 - 8

⇒ Valency of phosphate ion = -3

13.

Normal Electronic Configuration of Silicon

We know that the atomic number of silicon is 14 , so the normal electronic configuration → 2,8,4.

Sub-shell wise electronic configuration of Silicon

The sub - shell wise electronic configuration of silicon → 1s²2s²2p⁶3s²3p².

14. There are many diseases that are caused by bacteria some of them are:-

Cholera, Tuberculosis , Anthrax , Typhoid ,Tetanus , Citrus Canker (in plants , etc.