Q. When zinc reacts with hydrochloric acid, the gas evolved is
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Q. The high reactivity of fluorine is due to
Q. The pH of an aqueous solution of hydrochloric acid will be around
Q. In order to lower the temperature below 0°C, the substance mixed with ice is
Q. In galvanization, iron is coated with
Q. The mineral containing both magnesium and calcium is
Q. The metal that is used as a catalyst in the hydrogenation of oils is
Q. Which one of the following is not radioactive
Q. The gas emitted by burning wood is mainly
Q. Which group in the modern periodic table contains elements that are inert gases?
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