* Answer in one word . (1 mark each)
(17) How many products are formed from two or more reactants in combination reaction?
(18) Name synthetic indicators used to identify acids or bases.
(19) By what name are the unsaturated hydrocarbon which have double bonds known?
(20) Who gave us law of octaves for the arrangement of elements?
(21) Which are two main organs (parts) of central nervous system?
(22) Which part is responsible for the production of female germ cells in humans?
(23) How many sides does a glass prism have?
(24) Which gas is formed when combustion occurs in insufficient oxygen?
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17. One product
18. Phenolphthalein and Methyl orange
19. Alkenes
20. John Newlands
21. Brain and Spinal cord
22. Ovaries
23. Three
24. Carbon monoxide
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