Question

Answer in brief [Any five] [15]
19. A solution of a substance ‘X’ is used for whitewashing
(a) Name the substance ‘X’ and write its formula.
(b) Write the reaction of the substance ‘X’ named in (a) above, with water.
20. Give three uses each of the following (a) bleaching powder (b) baking soda.
21. Explain female reproductive system with labeled diagram.
22. Explain the refraction of light through a rectangular glass slab with schematic diagram .
23. Explain human respiratory system.
24. What were the criteria used by Mendeleev in creating his periodic table?​

Answer 1

answer no. 21

see the attachment

3d135a57de063c2f370bdfcc72b8424c.docx