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Q. The first thermionic valve was invented by
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Q. A piece of wood is held under water. The upthrust on it will be:
Q. Hydrochloric acid is also known as
Q. Heart beats …………. In fever
Q. Which among the given is caused by the higher concentration of Nitrogen & Phosphorous -
Q. Chemical name of vinegar is
Q. Which among the given is not a chemical action?
Q. All the following are examples of chemical change, except
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