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Q. Rain water helps to increase the _________ to some extent.
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Q. Which of the properties of the elements is a whole number ?
Q. What type of reaction is corrosion?
Q. Synthetic detergents are prepared from
Q. Chile saltpeter is the common name of:
Q. The mineral containing both magnesium and calcium is
Q. A ‘breath test’ used by traffic police to check drunken driving uses ____?
Q. Which of the following is neither an element nor a compound?
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