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Hey mate!!!
1)When red litmus is introduced in solution of sodium sulfate, the color changes to blue in red litmus paper because sodium sulfate is a base.
2)When a bottle of sulphuric acid filled upto the brim is left open in the laboratory, then the level of acid will reduce in the bottle. ... Since the concentrated sulphuric acid contains more amount of SO3 as compared to dilute acid which contain more amount of water as compared to acid.
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