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Q. Which of the following is present in maximum amount in acid rain?
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Q. Iron filings can be separated from a heterogenous mixture using the technique of:
Q. Biogradable wastes can usually be converted into useful substances with the help of:
Q. Which of the following one of the following metals is used to galvanise iron
Q. The hardest substance available on earth is
Q. What is the approximate time required for a heart-beat -
Q. The most important ore of aluminum is
Q. Alcohol prepared by the distillation of wood is:
Q. Hydrochloric acid is also known as
Q. Which of the following one of the following is a major green house gas
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