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27 carbon monoxide and chloro fluro carbons
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26. Clayey soil would be best for making pots, toys and statues.
27. Nitrogen dioxide and Sulphur dioxide cause acid rain.
28. Time - Second
Speed - Metre Per Second
29. 1.6s is the time period of the pendulum.
30. A real image is the collection of focus points actually made by converging rays, while a virtual image is the collection of focus points made by extensions of diverging rays. ... A real image occurs where rays converge, whereas a virtual image occurs where rays only appear to diverge.
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